Java/Swing JFC/Label

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Содержание

Active Label Sample

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.UIDefaults; import javax.swing.UIManager; public class ActiveSample { 

 private static final String LABEL_FACTORY = "LabelFactory";
 public static void main(String args[]) {
   JFrame frame = new JFrame("Active Example");
   UIManager.put(LABEL_FACTORY, new ActiveLabel());
   final JPanel panel = new JPanel();
   JButton button = new JButton("Get");
   ActionListener actionListener = new ActionListener() {
     public void actionPerformed(ActionEvent actionEvent) {
       JLabel label = (JLabel) UIManager.get(LABEL_FACTORY);
       panel.add(label);
       panel.revalidate();
     }
   };
   button.addActionListener(actionListener);
   Container contentPane = frame.getContentPane();
   contentPane.add(panel, BorderLayout.CENTER);
   contentPane.add(button, BorderLayout.SOUTH);
   frame.setSize(200, 200);
   frame.setVisible(true);
 }

} class ActiveLabel implements UIDefaults.ActiveValue { 

 private int counter = 0;
 public Object createValue(UIDefaults defaults) {
   JLabel label = new JLabel("" + counter++);
   return label;
 }

} 


 </source>



Adding an Icon to a JLabel Component

   <source lang="java">

import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JLabel; public class Main { 

 public static void main(String[] argv) throws Exception {
   Icon icon = new ImageIcon("icon.gif");
   JLabel label = new JLabel("Text Label", icon, JLabel.CENTER);
   // a label with only an icon
   label = new JLabel(icon);
 }

} 

 </source>



Adding Drag-and-Drop Support to a JLabel Component

   <source lang="java">

import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JComponent; import javax.swing.JLabel; import javax.swing.TransferHandler; public class Main { 

 public static void main(String[] argv) throws Exception {
   JLabel label = new JLabel("Label Text");
   final String propertyName = "text";
   label.setTransferHandler(new TransferHandler(propertyName));
   label.addMouseListener(new MouseAdapter() {
     public void mousePressed(MouseEvent evt) {
       JComponent comp = (JComponent) evt.getSource();
       TransferHandler th = comp.getTransferHandler();
       th.exportAsDrag(comp, evt, TransferHandler.COPY);
     }
   });
 }

} 

 </source>



A JLabel that uses inline HTML to format its text

   <source lang="java">

//A JLabel that uses inline HTML to format its text. import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class SwingHtmlLabel extends JPanel {

public static final String markup = "<html>line 1

" + "big blue line 2<p>line 3</html>"; public static void main(String argv[]) { JPanel p = new JPanel(new java.awt.GridLayout(0, 1)); p.add(new JLabel(markup)); p.add(new java.awt.Label(markup)); JFrame f = new JFrame("SwingHtmlLabel"); f.setContentPane(p); f.setSize(600, 200); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); } } </source>

A Label that uses inline HTML to format its text

   <source lang="java">

import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class Main extends JPanel { 

 public static final String markup = "<html>line 1<p>"
     + "big blue line 2<p>line 3</html>";
 public static void main(String argv[]) {
   JPanel p = new JPanel(new java.awt.GridLayout(0, 1));
   p.add(new JLabel(markup));
   p.add(new java.awt.Label(markup));
   JFrame f = new JFrame("HtmlLabel");
   f.setContentPane(p);
   f.setSize(600, 200);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.setVisible(true);
 }

} 

 </source>



A label with no indication it has been clicked

   <source lang="java">

import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JLabel; public class MyLabel extends JLabel { 

 public MyLabel(String msg) {
   super(msg);
   addMouseListener(new MouseAdapter() {
     public void mouseClicked(MouseEvent me) {
       fireActionPerformed(new ActionEvent(MyLabel.this, ActionEvent.ACTION_PERFORMED,
           "SecretMessage"));
     }
   });
 }
 public void addActionListener(ActionListener l) {
   listenerList.add(ActionListener.class, l);
 }
 public void removeActionListener(ActionListener l) {
   listenerList.remove(ActionListener.class, l);
 }
 protected void fireActionPerformed(ActionEvent ae) {
   Object[] listeners = listenerList.getListeners(ActionListener.class);
   for (int i = 0; i < listeners.length; i++) {
     ((ActionListener) listeners[i]).actionPerformed(ae);
   }
 }

} 

 </source>



Animation label

   <source lang="java">

import java.awt.Graphics; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JLabel; public class AnimatedLabel extends JLabel implements Runnable { 

 protected Icon[] icons;
 protected int index = 0;
 protected boolean isRunning;
 public AnimatedLabel(String gifName, int numGifs) {
   icons = new Icon[numGifs];
   for (int i = 0; i < numGifs; i++)
     icons[i] = new ImageIcon(gifName + i + ".gif");
   setIcon(icons[0]);
   Thread tr = new Thread(this);
   tr.setPriority(Thread.MAX_PRIORITY);
   tr.start();
 }
 public void setRunning(boolean r) {
   isRunning = r;
 }
 public boolean getRunning() {
   return isRunning;
 }
 public void run() {
   while (true) {
     if (isRunning) {
       index++;
       if (index >= icons.length)
         index = 0;
       setIcon(icons[index]);
       Graphics g = getGraphics();
       icons[index].paintIcon(this, g, 0, 0);
     } else {
       if (index > 0) {
         index = 0;
         setIcon(icons[0]);
       }
     }
     try {
       Thread.sleep(500);
     } catch (Exception ex) {
     }
   }
 }

} 


 </source>



A quick application to show a simple JLabel

   <source lang="java">

//A quick application to show a simple JLabel. import javax.swing.JFrame; import javax.swing.JLabel; public class SimpleJLabelExample { 

 public static void main(String[] args) {
   JLabel label = new JLabel("A Very Simple Text Label");
   JFrame frame = new JFrame();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.getContentPane().add(label);
   frame.pack();
   frame.setVisible(true);
 }

} 


 </source>



A simple demonstration of text alignment in JLabels

   <source lang="java">

//A simple demonstration of text alignment in JLabels. import java.awt.Color; import java.awt.GridLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingConstants; public class AlignmentExample { 

 public static void main(String[] args) {
   JLabel label1 = new JLabel("BottomRight", SwingConstants.RIGHT);
   JLabel label2 = new JLabel("CenterLeft", SwingConstants.LEFT);
   JLabel label3 = new JLabel("TopCenter", SwingConstants.CENTER);
   label1.setVerticalAlignment(SwingConstants.BOTTOM);
   label2.setVerticalAlignment(SwingConstants.CENTER);
   label3.setVerticalAlignment(SwingConstants.TOP);
   label1.setBorder(BorderFactory.createLineBorder(Color.black));
   label2.setBorder(BorderFactory.createLineBorder(Color.black));
   label3.setBorder(BorderFactory.createLineBorder(Color.black));
   JFrame frame = new JFrame("AlignmentExample");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel p = new JPanel(new GridLayout(3, 1, 8, 8));
   p.add(label1);
   p.add(label2);
   p.add(label3);
   p.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
   frame.setContentPane(p);
   frame.setSize(200, 200);
   frame.setVisible(true);
 }

} 


 </source>



Create a JLabel component

   <source lang="java">

import java.awt.FlowLayout; import java.awt.HeadlessException; import javax.swing.JFrame; import javax.swing.JLabel; public class Main extends JFrame { 

 public Main() throws HeadlessException {
   setSize(150, 300);
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   setLayout(new FlowLayout());
   JLabel label1 = new JLabel("Username :", JLabel.RIGHT);
   JLabel label2 = new JLabel("Password :", JLabel.RIGHT);
   JLabel label3 = new JLabel("Confirm Password :", JLabel.RIGHT);
   JLabel label4 = new JLabel("Remember Me!", JLabel.LEFT);
   JLabel label5 = new JLabel("Hello.", JLabel.CENTER);
   label5.setVerticalAlignment(JLabel.TOP);
   label5.setToolTipText("A tool tip with me!");
   getContentPane().add(label1);
   getContentPane().add(label2);
   getContentPane().add(label3);
   getContentPane().add(label4);
   getContentPane().add(label5);
 }
 public static void main(String[] args) {
   new Main().setVisible(true);
 }

} 

 </source>



Create a JLabel with an image icon

   <source lang="java">

import java.awt.FlowLayout; import java.awt.HeadlessException; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; public class Main extends JFrame { 

 public Main() throws HeadlessException {
   setSize(300, 300);
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   setLayout(new FlowLayout(FlowLayout.LEFT));
   Icon icon = new ImageIcon("a.png");
   JLabel label1 = new JLabel("Full Name :", icon, JLabel.LEFT);
   JLabel label2 = new JLabel("Address :", JLabel.LEFT);
   label2.setIcon(new ImageIcon("b.png"));
   getContentPane().add(label1);
   getContentPane().add(label2);
 }
 public static void main(String[] args) {
   new Main().setVisible(true);
 }

} 


 </source>



Create JLabel component

   <source lang="java">

import java.awt.FlowLayout; import java.awt.HeadlessException; import javax.swing.JFrame; import javax.swing.JLabel; public class Main extends JFrame { 

 public Main() throws HeadlessException {
   setSize(150, 300);
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   setLayout(new FlowLayout());
   JLabel label1 = new JLabel("Username :", JLabel.RIGHT);
   JLabel label2 = new JLabel("Password :", JLabel.RIGHT);
   JLabel label3 = new JLabel("Confirm Password :", JLabel.RIGHT);
   JLabel label4 = new JLabel("Remember Me!", JLabel.LEFT);
   JLabel label5 = new JLabel("Hello.", JLabel.CENTER);
   label5.setVerticalAlignment(JLabel.TOP);
   label5.setToolTipText("A tool tip with me!");
   getContentPane().add(label1);
   getContentPane().add(label2);
   getContentPane().add(label3);
   getContentPane().add(label4);
   getContentPane().add(label5);
 }
 public static void main(String[] args) {
   new Main().setVisible(true);
 }

} 

 </source>



Disable a label

   <source lang="java">

import java.awt.Color; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("asdf");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   label.setEnabled(false);
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



Grab and Drag image scroll label

   <source lang="java">

import java.awt.Container; import java.awt.Cursor; import java.awt.Point; import java.awt.event.MouseEvent; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.JViewport; import javax.swing.event.MouseInputAdapter; public class GrabAndDragDemo extends JFrame { 

 public GrabAndDragDemo() {
   super("Grab and drag Demo");
   ImageIcon ii = new ImageIcon("largejexpLogo.jpg");
   JScrollPane jsp = new JScrollPane(new GrabAndScrollLabel(ii));
   getContentPane().add(jsp);
   setSize(300, 250);
   setVisible(true);
   WindowListener l = new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   };
   addWindowListener(l);
 }
 public static void main(String[] args) {
   new GrabAndDragDemo();
 }

} class GrabAndScrollLabel extends JLabel { 

 public GrabAndScrollLabel(ImageIcon i) {
   super(i);
   MouseInputAdapter mia = new MouseInputAdapter() {
     int xDiff, yDiff;
     boolean isDragging;
     Container c;
     public void mouseDragged(MouseEvent e) {
       c = GrabAndScrollLabel.this.getParent();
       if (c instanceof JViewport) {
         JViewport jv = (JViewport) c;
         Point p = jv.getViewPosition();
         int newX = p.x - (e.getX() - xDiff);
         int newY = p.y - (e.getY() - yDiff);
         int maxX = GrabAndScrollLabel.this.getWidth()
             - jv.getWidth();
         int maxY = GrabAndScrollLabel.this.getHeight()
             - jv.getHeight();
         if (newX < 0)
           newX = 0;
         if (newX > maxX)
           newX = maxX;
         if (newY < 0)
           newY = 0;
         if (newY > maxY)
           newY = maxY;
         jv.setViewPosition(new Point(newX, newY));
       }
     }
     public void mousePressed(MouseEvent e) {
       setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
       xDiff = e.getX();
       yDiff = e.getY();
     }
     public void mouseReleased(MouseEvent e) {
       setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
     }
   };
   addMouseMotionListener(mia);
   addMouseListener(mia);
 }

} 


 </source>



Horizontal Alignment: CENTER

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("asdf");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   label.setPreferredSize(new Dimension(150, 100));
   
   label.setText("Centered");
   label.setHorizontalAlignment(JLabel.CENTER);
   label.setVerticalAlignment(JLabel.CENTER);
   
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



Horizontal Alignment: LEFT

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("asdf");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   label.setPreferredSize(new Dimension(150, 100));
   
   label.setText("Top Left");
   label.setHorizontalAlignment(JLabel.LEFT);
   label.setVerticalAlignment(JLabel.TOP);
   
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



Horizontal Alignment: RIGHT

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("asdf");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   label.setPreferredSize(new Dimension(150, 100));
   
   label.setText("Bottom Right");
   label.setHorizontalAlignment(JLabel.RIGHT);
   label.setVerticalAlignment(JLabel.BOTTOM);
   
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



HTML label

   <source lang="java">

import java.awt.FlowLayout; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; public class HtmlLabel extends JFrame { 

 public HtmlLabel() {
   super("HTML Buttons");
   setSize(400, 300);
   getContentPane().setLayout(new FlowLayout());
String htmlText = "<html><p>JButton

" 
       + "" + "with HTML text</html>";
   JLabel btn = new JLabel(htmlText);
   getContentPane().add(btn);
   WindowListener wndCloser = new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   };
   addWindowListener(wndCloser);
   setVisible(true);
 }
 public static void main(String args[]) {
   new HtmlLabel();
 }

} 


 </source>



JLabel is for displaying text, images or both. It does not react to input events.

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Font; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class MyLabel extends JFrame { 

 public static void main(String[] args) {
   String lyrics = "<html>Line
line
line</html>";
   JPanel panel = new JPanel();
   panel.setLayout(new BorderLayout(10, 10));
   JLabel label = new JLabel(lyrics);
   label.setFont(new Font("Georgia", Font.PLAIN, 14));
   label.setForeground(new Color(50, 50, 25));
   panel.add(label, BorderLayout.CENTER);
   panel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
   JFrame f = new JFrame();
   f.add(panel);
   f.pack();
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.setVisible(true);
 }

} 

 </source>



JLabel with lined border

   <source lang="java">

import java.awt.Color; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("A default label");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



JLabel with more than one row

   <source lang="java">

JLabel label = new JLabel(); label.setText("<html>Line 1
Line 2</html>"); 

 </source>



JSlider lets the user graphically select a value by sliding a knob within a bounded interval.

   <source lang="java">

import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JSlider; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class Slider { 

 public static void main(String[] args) {
   JFrame f = new JFrame();
   final JSlider slider = new JSlider(0, 150, 0);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   slider.setPreferredSize(new Dimension(150, 30));
   slider.addChangeListener(new ChangeListener() {
     public void stateChanged(ChangeEvent event) {
       int value = slider.getValue();
       if (value == 0) {
         System.out.println("0");
       } else if (value > 0 && value <= 30) {
         System.out.println("value > 0 && value <= 30");
       } else if (value > 30 && value < 80) {
         System.out.println("value > 30 && value < 80");
       } else {
         System.out.println("max");
       }
     }
   });
   f.add(slider);
   f.pack();
   f.setLocationRelativeTo(null);
   f.setVisible(true);
 }

} 

 </source>



Label alignment

   <source lang="java">

import java.awt.Color; import java.awt.ruponent; import java.awt.Dimension; import java.awt.Graphics; import java.awt.GridLayout; import javax.swing.BorderFactory; import javax.swing.Icon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class AlignLabels extends JPanel { 

 JLabel[] labels = new JLabel[9];
 public AlignLabels() {
   JLabel label;
   setLayout(new GridLayout(3, 3));
   label = createLabel("NW alignment");
   setNWalignment(label);
   label.setEnabled(false);
   labels[0] = label;
   label = createLabel("N alignment");
   setNalignment(label);
   labels[1] = label;
   label = createLabel("NE alignment");
   setNEalignment(label);
   labels[2] = label;
   label = createLabel("W alignment");
   label.setText("<html>html based
W alignment");
   setWalignment(label);
   labels[3] = label;
   label = createLabel("C alignment");
   setCalignment(label);
   label.setEnabled(false);
   labels[4] = label;
   label = createLabel("E alignment");
   setEalignment(label);
   labels[5] = label;
   label = createLabel("SW alignment");
   setSWalignment(label);
   labels[6] = label;
   label = createLabel("S alignment");
   setSalignment(label);
   labels[7] = label;
   label = createLabel("SE alignment");
   setSEalignment(label);
   label.setEnabled(false);
   labels[8] = label;
 }
 public static void main(String[] a) {
   JFrame mainFrame = new JFrame();
   mainFrame.getContentPane().add(new AlignLabels());
   
   mainFrame.setSize(500,500);
   mainFrame.setVisible(true);
 }
 JLabel[] getLabels() {
   return labels;
 }
 JLabel createLabel(String text) {
   String separator = System.getProperty("line.separator");
   JLabel label = new JLabel(text + separator + "multiline" + separator
       + "label");
   label.setToolTipText(text + "\n\ndoubled space\n\ntooltip");
   label.setBorder(BorderFactory.createEtchedBorder());
   this.add(label);
   label.setPreferredSize(new Dimension(125, 125));
   return label;
 }
 void setNWalignment(JLabel b) {
   b.setHorizontalAlignment(JLabel.LEFT);
   b.setVerticalAlignment(JLabel.TOP);
 }
 void setNalignment(JLabel b) {
   b.setHorizontalAlignment(JLabel.CENTER);
   b.setVerticalAlignment(JLabel.TOP);
 }
 void setNEalignment(JLabel b) {
   b.setHorizontalAlignment(JLabel.RIGHT);
   b.setVerticalAlignment(JLabel.TOP);
 }
 void setWalignment(JLabel b) {
   b.setHorizontalAlignment(JLabel.LEFT);
   b.setVerticalAlignment(JLabel.CENTER);
 }
 void setCalignment(JLabel b) {
   b.setHorizontalAlignment(JLabel.CENTER);
   b.setVerticalAlignment(JLabel.CENTER);
 }
 void setEalignment(JLabel b) {
   b.setHorizontalAlignment(JLabel.RIGHT);
   b.setVerticalAlignment(JLabel.CENTER);
 }
 void setSWalignment(JLabel b) {
   b.setHorizontalAlignment(JLabel.LEFT);
   b.setVerticalAlignment(JLabel.BOTTOM);
 }
 void setSalignment(JLabel b) {
   b.setHorizontalAlignment(JLabel.CENTER);
   b.setVerticalAlignment(JLabel.BOTTOM);
 }
 void setSEalignment(JLabel b) {
   b.setHorizontalAlignment(JLabel.RIGHT);
   b.setVerticalAlignment(JLabel.BOTTOM);
 }

} class ColoredSquare implements Icon { 

 Color color;
 public ColoredSquare(Color color) {
   this.color = color;
 }
 public void paintIcon(Component c, Graphics g, int x, int y) {
   Color oldColor = g.getColor();
   g.setColor(color);
   g.fill3DRect(x, y, getIconWidth(), getIconHeight(), true);
   g.setColor(oldColor);
 }
 public int getIconWidth() {
   return 12;
 }
 public int getIconHeight() {
   return 12;
 }

} 


 </source>



Label background, icon, align

   <source lang="java">

import java.awt.Color; import java.awt.Font; import java.awt.GridLayout; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingConstants; public class LabelDemo extends JFrame { 

 public LabelDemo() {
   super("JLabel Demo");
   setSize(600, 100);
   JPanel content = new JPanel(new GridLayout(1, 4, 4, 4));
   JLabel label = new JLabel("jexp");
   label.setBackground(Color.white);
   content.add(label);
   label = new JLabel("jexp", SwingConstants.CENTER);
   label.setOpaque(true);
   label.setBackground(Color.white);
   content.add(label);
   label = new JLabel("jexp");
   label.setFont(new Font("Helvetica", Font.BOLD, 18));
   label.setOpaque(true);
   label.setBackground(Color.white);
   content.add(label);
   ImageIcon image = new ImageIcon("jexpLogo.gif");
   label = new JLabel("jexp", image, SwingConstants.RIGHT);
   label.setVerticalTextPosition(SwingConstants.TOP);
   label.setOpaque(true);
   label.setBackground(Color.white);
   content.add(label);
   getContentPane().add(content);
   setVisible(true);
 }
 public static void main(String args[]) {
   new LabelDemo();
 }

} 


 </source>



LabelFocusSample: setLabelFor

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.KeyEvent; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; public class LabelFocusSample { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Label Focus Example");
   Container content = frame.getContentPane();
   JPanel panel = new JPanel(new BorderLayout());
   JLabel label = new JLabel("Name: ");
   label.setDisplayedMnemonic(KeyEvent.VK_N);
   JTextField textField = new JTextField();
   label.setLabelFor(textField);
   panel.add(label, BorderLayout.WEST);
   panel.add(textField, BorderLayout.CENTER);
   content.add(panel, BorderLayout.NORTH);
   content.add(new JButton("Somewhere Else"), BorderLayout.SOUTH);
   frame.setSize(250, 150);
   frame.setVisible(true);
 }

} 


 </source>



Label for

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.BoundedRangeModel; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; public class OffsetSample { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Offset Example");
   Container content = frame.getContentPane();
   JPanel panel = new JPanel(new BorderLayout());
   JLabel label = new JLabel("Name: ");
   label.setDisplayedMnemonic(KeyEvent.VK_N);
   final JTextField textField = new JTextField();
   label.setLabelFor(textField);
   panel.add(label, BorderLayout.WEST);
   panel.add(textField, BorderLayout.CENTER);
   content.add(panel, BorderLayout.NORTH);
   JButton button = new JButton("Get Offset");
   ActionListener actionListener = new ActionListener() {
     public void actionPerformed(ActionEvent actionEvent) {
       System.out.println("Offset: " + textField.getScrollOffset());
       System.out.println("Visibility: "
           + textField.getHorizontalVisibility());
       BoundedRangeModel model = textField.getHorizontalVisibility();
       int extent = model.getExtent();
       textField.setScrollOffset(extent);
     }
   };
   button.addActionListener(actionListener);
   content.add(button, BorderLayout.SOUTH);
   frame.setSize(250, 150);
   frame.setVisible(true);
 }

} 


 </source>



LabelFor Demo

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.KeyEvent; import javax.swing.Box; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; public class LabelFor { 

 public static void main(String args[]) {
   JFrame f = new JFrame("LabelFor Sample");
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container content = f.getContentPane();
   JLabel label = new JLabel("Username");
   JTextField textField = new JTextField();
   label.setDisplayedMnemonic(KeyEvent.VK_U);
   label.setLabelFor(textField);
   Container box = Box.createHorizontalBox();
   box.add(label);
   box.add(textField);
   content.add(box, BorderLayout.NORTH);
   content.add(new JButton("Submit"), BorderLayout.SOUTH);
   f.setSize(300, 200);
   f.setVisible(true);
 }

} 


 </source>



Label Text Position

   <source lang="java">

import java.awt.Container; import java.awt.GridLayout; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; import javax.swing.border.LineBorder; public class LabelTextPos { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Label Text Pos");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container content = frame.getContentPane();
   content.setLayout(new GridLayout(2, 2));
   Border border = LineBorder.createGrayLineBorder();
   Icon warnIcon = new ImageIcon("Warn.gif");
   JLabel label1 = new JLabel(warnIcon);
   label1.setText("Left-Bottom");
   label1.setHorizontalTextPosition(JLabel.LEFT);
   label1.setVerticalTextPosition(JLabel.BOTTOM);
   label1.setBorder(border);
   content.add(label1);
   JLabel label2 = new JLabel(warnIcon);
   label2.setText("Right-TOP");
   label2.setHorizontalTextPosition(JLabel.RIGHT);
   label2.setVerticalTextPosition(JLabel.TOP);
   label2.setBorder(border);
   content.add(label2);
   JLabel label3 = new JLabel(warnIcon);
   label3.setText("Center-Center");
   label3.setHorizontalTextPosition(JLabel.CENTER);
   label3.setVerticalTextPosition(JLabel.CENTER);
   label3.setBorder(border);
   content.add(label3);
   JLabel label4 = new JLabel(warnIcon);
   label4.setText("Center-Bottom");
   label4.setHorizontalTextPosition(JLabel.CENTER);
   label4.setVerticalTextPosition(JLabel.BOTTOM);
   label4.setBorder(border);
   content.add(label4);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

} 


 </source>



Label with HTML Sample

   <source lang="java">

import java.awt.Container; import java.awt.GridLayout; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; public class LabelSample { 

 public static void main(String args[]) {
   String title = "JLabel Sample";
   JFrame frame = new JFrame(title);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container content = frame.getContentPane();
   content.setLayout(new GridLayout(2, 2));
   JLabel label1 = new JLabel("Text Label");
   content.add(label1);
   Icon warnIcon = new ImageIcon("Warn.gif");
   JLabel label2 = new JLabel(warnIcon);
   content.add(label2);
   JLabel label3 = new JLabel("Warning", warnIcon, JLabel.CENTER);
   content.add(label3);
   String htmlLabel = "<html>HTML Label
"
       + "Multi-line";
   JLabel label4 = new JLabel(htmlLabel);
   content.add(label4);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

} 


 </source>



Label with Icon

   <source lang="java">

import java.awt.Color; import java.awt.ruponent; import java.awt.Container; import java.awt.Graphics; import java.awt.Polygon; import javax.swing.Icon; import javax.swing.JFrame; import javax.swing.JLabel; public class LabelIcon { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Label Icon");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container content = frame.getContentPane();
   Icon icon = new DiamondIcon(Color.red, true, 25, 25);
   JLabel label1 = new JLabel(icon);
   content.add(label1);
   frame.setSize(200, 100);
   frame.setVisible(true);
 }

} class DiamondIcon implements Icon { 

 private Color color;
 private boolean selected;
 private int width;
 private int height;
 private Polygon poly;
 private static final int DEFAULT_WIDTH = 10;
 private static final int DEFAULT_HEIGHT = 10;
 public DiamondIcon(Color color) {
   this(color, true, DEFAULT_WIDTH, DEFAULT_HEIGHT);
 }
 public DiamondIcon(Color color, boolean selected) {
   this(color, selected, DEFAULT_WIDTH, DEFAULT_HEIGHT);
 }
 public DiamondIcon(Color color, boolean selected, int width, int height) {
   this.color = color;
   this.selected = selected;
   this.width = width;
   this.height = height;
   initPolygon();
 }
 private void initPolygon() {
   poly = new Polygon();
   int halfWidth = width / 2;
   int halfHeight = height / 2;
   poly.addPoint(0, halfHeight);
   poly.addPoint(halfWidth, 0);
   poly.addPoint(width, halfHeight);
   poly.addPoint(halfWidth, height);
 }
 public int getIconHeight() {
   return height;
 }
 public int getIconWidth() {
   return width;
 }
 public void paintIcon(Component c, Graphics g, int x, int y) {
   g.setColor(color);
   g.translate(x, y);
   if (selected) {
     g.fillPolygon(poly);
   } else {
     g.drawPolygon(poly);
   }
   g.translate(-x, -y);
 }

} 


 </source>



Label with Image

   <source lang="java">

import java.awt.Container; import java.awt.GridLayout; import java.awt.Image; import java.awt.Toolkit; import java.io.BufferedInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; public class LabelJarSample { 

 public static void main(String args[]) {
   String title = "JLabel Sample";
   JFrame frame = new JFrame(title);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container content = frame.getContentPane();
   content.setLayout(new GridLayout(2, 2));
   JLabel label1 = new JLabel("Text Label");
   content.add(label1);
   Image warnImage = ImageLoader.getImage(LabelJarSample.class, "Warn.gif");
   Icon warnIcon = new ImageIcon(warnImage);
   JLabel label2 = new JLabel(warnIcon);
   content.add(label2);
   JLabel label3 = new JLabel("Warning", warnIcon, JLabel.CENTER);
   content.add(label3);
   String htmlLabel = "<html>HTML Label
"
       + "Multi-line";
   JLabel label4 = new JLabel(htmlLabel);
   content.add(label4);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

} final class ImageLoader { 

 private ImageLoader() {
 }
 public static Image getImage(Class relativeClass, String filename) {
   Image returnValue = null;
   InputStream is = relativeClass.getResourceAsStream(filename);
   if (is != null) {
     BufferedInputStream bis = new BufferedInputStream(is);
     ByteArrayOutputStream baos = new ByteArrayOutputStream();
     try {
       int ch;
       while ((ch = bis.read()) != -1) {
         baos.write(ch);
       }
       returnValue = Toolkit.getDefaultToolkit().createImage(
           baos.toByteArray());
     } catch (IOException exception) {
       System.err.println("Error loading: " + filename);
     }
   }
   return returnValue;
 }

} 


 </source>



Label with ImageIcon (Icon)

   <source lang="java">

import java.awt.Color; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   ImageIcon myIcon = new ImageIcon("myIcon.gif");
   
   JLabel label= new JLabel("A default label", myIcon, JLabel.LEFT);
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



Label with various effects

   <source lang="java">

import java.awt.BasicStroke; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GridLayout; import java.awt.Image; import java.awt.Insets; import java.awt.Rectangle; import java.awt.RenderingHints; import java.awt.Shape; import java.awt.Stroke; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import java.awt.font.FontRenderContext; import java.awt.font.TextLayout; import java.awt.geom.AffineTransform; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.LineBorder; public class JLabel2D extends JLabel { 

 public static final int EFFECT_PLAIN = 0;
 public static final int EFFECT_GRADIENT = 1;
 public static final int EFFECT_IMAGE = 2;
 public static final int EFFECT_IMAGE_ANIMATION = 3;
 public static final int EFFECT_COLOR_ANIMATION = 4;
 protected int effectIndex = EFFECT_PLAIN;
 protected double shearFactor = 0.0;
 protected Color outlineColor;
 protected Stroke stroke;
 protected GradientPaint gradient;
 protected Image foregroundImage;
 protected Thread animator;
 protected boolean isRunning = false;
 protected int m_delay;
 protected int m_xShift;
 public JLabel2D() {
   super();
 }
 public JLabel2D(String text) {
   super(text);
 }
 public JLabel2D(String text, int alignment) {
   super(text, alignment);
 }
 public void setEffectIndex(int e) {
   effectIndex = e;
   repaint();
 }
 public int getEffectIndex() {
   return effectIndex;
 }
 public void setShearFactor(double s) {
   shearFactor = s;
   repaint();
 }
 public double getShearFactor() {
   return shearFactor;
 }
 public void setOutlineColor(Color c) {
   outlineColor = c;
   repaint();
 }
 public Color getOutlineColor() {
   return outlineColor;
 }
 public void setStroke(Stroke s) {
   stroke = s;
   repaint();
 }
 public Stroke getStroke() {
   return stroke;
 }
 public void setGradient(GradientPaint g) {
   gradient = g;
   repaint();
 }
 public GradientPaint getGradient() {
   return gradient;
 }
 public void setForegroundImage(Image img) {
   foregroundImage = img;
   repaint();
 }
 public Image getForegroundImage() {
   return foregroundImage;
 }
 public void startAnimation(int delay) {
   if (animator != null)
     return;
   m_delay = delay;
   m_xShift = 0;
   isRunning = true;
   animator = new Thread() {
     double arg = 0;
     public void run() {
       while (isRunning) {
         if (effectIndex == EFFECT_IMAGE_ANIMATION)
           m_xShift += 10;
         else if (effectIndex == EFFECT_COLOR_ANIMATION
             && gradient != null) {
           arg += Math.PI / 10;
           double cos = Math.cos(arg);
           double f1 = (1 + cos) / 2;
           double f2 = (1 - cos) / 2;
           arg = arg % (Math.PI * 2);
           Color c1 = gradient.getColor1();
           Color c2 = gradient.getColor2();
           int r = (int) (c1.getRed() * f1 + c2.getRed() * f2);
           r = Math.min(Math.max(r, 0), 255);
           int g = (int) (c1.getGreen() * f1 + c2.getGreen() * f2);
           g = Math.min(Math.max(g, 0), 255);
           int b = (int) (c1.getBlue() * f1 + c2.getBlue() * f2);
           b = Math.min(Math.max(b, 0), 255);
           setForeground(new Color(r, g, b));
         }
         repaint();
         try {
           sleep(m_delay);
         } catch (InterruptedException ex) {
           break;
         }
       }
     }
   };
   animator.start();
 }
 public void stopAnimation() {
   isRunning = false;
   animator = null;
 }
 public void paintComponent(Graphics g) {
   Dimension d = getSize();
   Insets ins = getInsets();
   int x = ins.left;
   int y = ins.top;
   int w = d.width - ins.left - ins.right;
   int h = d.height - ins.top - ins.bottom;
   if (isOpaque()) {
     g.setColor(getBackground());
     g.fillRect(0, 0, d.width, d.height);
   }
   paintBorder(g);
   Graphics2D g2 = (Graphics2D) g;
   g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
       RenderingHints.VALUE_ANTIALIAS_ON);
   g2.setRenderingHint(RenderingHints.KEY_RENDERING,
       RenderingHints.VALUE_RENDER_QUALITY);
   FontRenderContext frc = g2.getFontRenderContext();
   TextLayout tl = new TextLayout(getText(), getFont(), frc);
   AffineTransform shear = AffineTransform.getShearInstance(shearFactor,
       0.0);
   Shape src = tl.getOutline(shear);
   Rectangle rText = src.getBounds();
   float xText = x - rText.x;
   switch (getHorizontalAlignment()) {
   case CENTER:
     xText = x + (w - rText.width) / 2;
     break;
   case RIGHT:
     xText = x + (w - rText.width);
     break;
   }
   float yText = y + h / 2 + tl.getAscent() / 4;
   AffineTransform shift = AffineTransform.getTranslateInstance(xText,
       yText);
   Shape shp = shift.createTransformedShape(src);
   if (outlineColor != null) {
     g2.setColor(outlineColor);
     if (stroke != null)
       g2.setStroke(stroke);
     g2.draw(shp);
   }
   switch (effectIndex) {
   case EFFECT_GRADIENT:
     if (gradient == null)
       break;
     g2.setPaint(gradient);
     g2.fill(shp);
     break;
   case EFFECT_IMAGE:
     fillByImage(g2, shp, 0);
     break;
   case EFFECT_COLOR_ANIMATION:
     g2.setColor(getForeground());
     g2.fill(shp);
     break;
   case EFFECT_IMAGE_ANIMATION:
     if (foregroundImage == null)
       break;
     int wImg = foregroundImage.getWidth(this);
     if (m_xShift > wImg)
       m_xShift = 0;
     fillByImage(g2, shp, m_xShift - wImg);
     break;
   default:
     g2.setColor(getForeground());
     g2.fill(shp);
     break;
   }
 }
 protected void fillByImage(Graphics2D g2, Shape shape, int xOffset) {
   if (foregroundImage == null)
     return;
   int wImg = foregroundImage.getWidth(this);
   int hImg = foregroundImage.getHeight(this);
   if (wImg <= 0 || hImg <= 0)
     return;
   g2.setClip(shape);
   Rectangle bounds = shape.getBounds();
   for (int xx = bounds.x + xOffset; xx < bounds.x + bounds.width; xx += wImg)
     for (int yy = bounds.y; yy < bounds.y + bounds.height; yy += hImg)
       g2.drawImage(foregroundImage, xx, yy, this);
 }
 public static void main(String argv[]) {
   JFrame f = new JFrame("2D Labels");
   f.setSize(600, 300);
   f.getContentPane().setLayout(new GridLayout(6, 1, 5, 5));
   f.getContentPane().setBackground(Color.white);
   Font bigFont = new Font("Helvetica", Font.BOLD, 24);
   JLabel2D lbl = new JLabel2D("Java Source and Support With Outline",
       JLabel.CENTER);
   lbl.setFont(bigFont);
   lbl.setForeground(Color.blue);
   lbl.setBorder(new LineBorder(Color.black));
   lbl.setBackground(Color.cyan);
   lbl.setOutlineColor(Color.yellow);
   lbl.setStroke(new BasicStroke(5f));
   lbl.setOpaque(true);
   lbl.setShearFactor(0.3);
   f.getContentPane().add(lbl);
   lbl = new JLabel2D("Java Source and Support With Color Gradient", JLabel.CENTER);
   lbl.setFont(bigFont);
   lbl.setOutlineColor(Color.black);
   lbl.setEffectIndex(JLabel2D.EFFECT_GRADIENT);
   GradientPaint gp = new GradientPaint(0, 0, Color.red, 100, 50,
       Color.blue, true);
   lbl.setGradient(gp);
   f.getContentPane().add(lbl);
   lbl = new JLabel2D("Java Source and Support Filled With Image", JLabel.CENTER);
   lbl.setFont(bigFont);
   lbl.setEffectIndex(JLabel2D.EFFECT_IMAGE);
   ImageIcon icon = new ImageIcon("mars.gif");
   lbl.setForegroundImage(icon.getImage());
   lbl.setOutlineColor(Color.red);
   f.getContentPane().add(lbl);
   lbl = new JLabel2D("Java Source and Support With Image Animation", JLabel.CENTER);
   lbl.setFont(bigFont);
   lbl.setEffectIndex(JLabel2D.EFFECT_IMAGE_ANIMATION);
   icon = new ImageIcon("ocean.gif");
   lbl.setForegroundImage(icon.getImage());
   lbl.setOutlineColor(Color.black);
   lbl.startAnimation(400);
   f.getContentPane().add(lbl);
   lbl = new JLabel2D("Java Source and Support With Color Animation", JLabel.CENTER);
   lbl.setFont(bigFont);
   lbl.setEffectIndex(JLabel2D.EFFECT_COLOR_ANIMATION);
   lbl.setGradient(gp);
   lbl.setOutlineColor(Color.black);
   lbl.startAnimation(400);
   f.getContentPane().add(lbl);
   JLabel lbl1 = new JLabel("Plain Java Source and Support For Comparison", JLabel.CENTER);
   lbl1.setFont(bigFont);
   lbl1.setForeground(Color.black);
   f.getContentPane().add(lbl1);
   WindowListener wndCloser = new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   };
   f.addWindowListener(wndCloser);
   f.setVisible(true);
 }

} 


 </source>



Multiline label (HTML)

   <source lang="java">

import java.awt.Color; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("<html>Use HTML to create
" + "a multiline message."
       + "
One
Two
Three");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



Putting HTML text on Swing components

   <source lang="java">

// : c14:HTMLButton.java // Putting HTML text on Swing components. // <applet code=HTMLButton width=250 height=500></applet> // From "Thinking in Java, 3rd ed." (c) Bruce Eckel 2002 // www.BruceEckel.ru. See copyright notice in CopyRight.txt. import java.awt.Container; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JApplet; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; public class HTMLButton extends JApplet { 

 private JButton b = new JButton("<html>"
+ "
Hello!
Press me now!"); 
 public void init() {
   b.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent e) {
       getContentPane().add(
           new JLabel("<html>" + "<i>Kapow!"));
       // Force a re-layout to include the new label:
       validate();
     }
   });
   Container cp = getContentPane();
   cp.setLayout(new FlowLayout());
   cp.add(b);
 }
 public static void main(String[] args) {
   run(new HTMLButton(), 200, 500);
 }
 public static void run(JApplet applet, int width, int height) {
   JFrame frame = new JFrame();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.getContentPane().add(applet);
   frame.setSize(width, height);
   applet.init();
   applet.start();
   frame.setVisible(true);
 }

} ///:~ 


 </source>



Scrollable Label

   <source lang="java">

import java.awt.Dimension; import java.awt.Rectangle; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.Scrollable; public class ScrollableLabel extends JLabel implements Scrollable { 

 public ScrollableLabel(ImageIcon i) {
   super(i);
 }
 public Dimension getPreferredScrollableViewportSize() {
   return getPreferredSize();
 }
 public int getScrollableBlockIncrement(Rectangle r, int orietation,
     int direction) {
   return 10;
 }
 public boolean getScrollableTracksViewportHeight() {
   return false;
 }
 public boolean getScrollableTracksViewportWidth() {
   return false;
 }
 public int getScrollableUnitIncrement(Rectangle r, int orientation,
     int direction) {
   return 10;
 }
 public static void main(String[] args) {
   JFrame f = new JFrame("JScrollPane Demo");
   ImageIcon ii = new ImageIcon("largejexpLogo.gif");
   JScrollPane jsp = new JScrollPane(new ScrollableLabel(ii));
   f.getContentPane().add(jsp);
   f.setSize(300, 250);
   f.setVisible(true);
 }

} 


 </source>



Set the Preferred Size

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("asdf");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   label.setPreferredSize(new Dimension(150, 100));
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



Setting the Focus of a JTextField Component Using a JLabel Component

   <source lang="java">

import java.awt.event.KeyEvent; import javax.swing.JLabel; import javax.swing.JTextField; public class Main { 

 public static void main(String[] argv) throws Exception {
   JTextField textfield = new JTextField(25);
   // Create label and associate with text field
   JLabel label = new JLabel("Text Label");
   label.setDisplayedMnemonic(KeyEvent.VK_L);
   label.setLabelFor(textfield);
 }

} 

 </source>



Shows how displayed Mnemonic and labelFor properties work together

   <source lang="java">

//Shows how displayedMnemonic and labelFor properties work together import java.awt.GridLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; public class MnemonicLabels { 

 public static void main(String[] args) {
   JTextField firstField = new JTextField(10);
   JTextField middleField = new JTextField(10);
   JTextField lastField = new JTextField(10);
   JLabel firstLabel = new JLabel("First Name", JLabel.RIGHT);
   firstLabel.setDisplayedMnemonic("F");
   firstLabel.setLabelFor(firstField);
   JLabel middleLabel = new JLabel("Middle Initial", JLabel.RIGHT);
   middleLabel.setDisplayedMnemonic("I");
   middleLabel.setDisplayedMnemonicIndex(7);
   middleLabel.setLabelFor(middleField);
   JLabel lastLabel = new JLabel("Last Name", JLabel.RIGHT);
   lastLabel.setDisplayedMnemonic("L");
   lastLabel.setLabelFor(lastField);
   JPanel p = new JPanel();
   p.setLayout(new GridLayout(3, 2, 5, 5));
   p.add(firstLabel);
   p.add(firstField);
   p.add(middleLabel);
   p.add(middleField);
   p.add(lastLabel);
   p.add(lastField);
   JFrame f = new JFrame("MnemonicLabels");
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.setContentPane(p);
   f.pack();
   f.setVisible(true);
 }

} 


 </source>



Solve the problem of text alignment in JLabels

   <source lang="java">

import java.awt.Color; import java.awt.GridLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingConstants; public class Main { 

 public static void main(String[] args) {
   JLabel label1 = new JLabel("BottomRight", SwingConstants.RIGHT);
   JLabel label2 = new JLabel("CenterLeft", SwingConstants.LEFT);
   JLabel label3 = new JLabel("TopCenter", SwingConstants.CENTER);
   label1.setVerticalAlignment(SwingConstants.BOTTOM);
   label2.setVerticalAlignment(SwingConstants.CENTER);
   label3.setVerticalAlignment(SwingConstants.TOP);
   label1.setBorder(BorderFactory.createLineBorder(Color.black));
   label2.setBorder(BorderFactory.createLineBorder(Color.black));
   label3.setBorder(BorderFactory.createLineBorder(Color.black));
   JFrame frame = new JFrame("AlignmentExample");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel p = new JPanel(new GridLayout(3, 1, 8, 8));
   p.add(label1);
   p.add(label2);
   p.add(label3);
   p.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
   frame.setContentPane(p);
   frame.setSize(200, 200);
   frame.setVisible(true);
 }

} 

 </source>



Swing Label Demo

   <source lang="java">

/* From http://java.sun.ru/docs/books/tutorial/index.html */ /* 

* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistribution of source code must retain the above copyright notice, this
*  list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright notice,
*  this list of conditions and the following disclaimer in the documentation
*  and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/

import java.awt.GridLayout; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; /* 

* SwingLabelDemo.java is a 1.4 application that needs one other file:
*   images/middle.gif
*/

public class SwingLabelDemo extends JPanel { 

   public SwingLabelDemo() {
       super(new GridLayout(3,1));  //3 rows, 1 column
       JLabel label1, label2, label3;
       ImageIcon icon = createImageIcon("images/middle.gif",
                                        "a pretty but meaningless splat");
       //Create the first label.
       label1 = new JLabel("Image and Text",
                           icon,
                           JLabel.CENTER);
       //Set the position of its text, relative to its icon:
       label1.setVerticalTextPosition(JLabel.BOTTOM);
       label1.setHorizontalTextPosition(JLabel.CENTER);
       //Create the other labels.
       label2 = new JLabel("Text-Only Label");
       label3 = new JLabel(icon);
       //Create tool tips, for the heck of it.
       label1.setToolTipText("A label containing both image and text");
       label2.setToolTipText("A label containing only text");
       label3.setToolTipText("A label containing only an image");
       //Add the labels.
       add(label1);
       add(label2);
       add(label3);
   }
   /** Returns an ImageIcon, or null if the path was invalid. */
   protected static ImageIcon createImageIcon(String path,
                                              String description) {
       java.net.URL imgURL = SwingLabelDemo.class.getResource(path);
       if (imgURL != null) {
           return new ImageIcon(imgURL, description);
       } else {
           System.err.println("Couldn"t find file: " + path);
           return null;
       }
   }
   /**
    * Create the GUI and show it.  For thread safety,
    * this method should be invoked from the
    * event-dispatching thread.
    */
   private static void createAndShowGUI() {
       //Make sure we have nice window decorations.
       JFrame.setDefaultLookAndFeelDecorated(true);
       //Create and set up the window.
       JFrame frame = new JFrame("SwingLabelDemo");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       //Create and set up the content pane.
       SwingLabelDemo newContentPane = new SwingLabelDemo();
       newContentPane.setOpaque(true); //content panes must be opaque
       frame.setContentPane(newContentPane);
       //Display the window.
       frame.pack();
       frame.setVisible(true);
   }
   public static void main(String[] args) {
       //Schedule a job for the event-dispatching thread:
       //creating and showing this application"s GUI.
       javax.swing.SwingUtilities.invokeLater(new Runnable() {
           public void run() {
               createAndShowGUI();
           }
       });
   }

} 


 </source>



The text is horizontally and vertically centered

   <source lang="java">

import javax.swing.JLabel; public class Main { 

 public static void main(String[] argv) throws Exception {
   JLabel label = new JLabel("Text Label", JLabel.CENTER);
 }

} 

 </source>



The text is left-justified and bottom-aligned

   <source lang="java">

import javax.swing.JLabel; public class Main { 

 public static void main(String[] argv) throws Exception {
   JLabel label = new JLabel("Text Label", JLabel.LEFT);
   label.setVerticalAlignment(JLabel.BOTTOM);
 }

} 

 </source>



The text is left-justified and top-aligned

   <source lang="java">

import javax.swing.JLabel; public class Main { 

 public static void main(String[] argv) throws Exception {
   JLabel label = new JLabel("Text Label", JLabel.LEFT);
   label.setVerticalAlignment(JLabel.TOP);
 }

} 

 </source>



The text is right-justified and bottom-aligned

   <source lang="java">

import javax.swing.JLabel; public class Main { 

 public static void main(String[] argv) throws Exception {
   JLabel label = new JLabel("Text Label", JLabel.RIGHT);
   label.setVerticalAlignment(JLabel.BOTTOM);
 }

} 

 </source>



The text is right-justified and top-aligned

   <source lang="java">

import javax.swing.JLabel; public class Main { 

 public static void main(String[] argv) throws Exception {
   JLabel label = new JLabel("Text Label", JLabel.RIGHT);
   label.setVerticalAlignment(JLabel.TOP);
 }

} 

 </source>



The text is right-justified and vertically centered

   <source lang="java">

import javax.swing.JLabel; public class Main { 

 public static void main(String[] argv) throws Exception {
   JLabel label = new JLabel("Text Label", JLabel.RIGHT);
 }

} 

 </source>



Use a ScrollBar in both vertical and horizontal direction

   <source lang="java">

import java.awt.BorderLayout; import java.awt.event.AdjustmentEvent; import java.awt.event.AdjustmentListener; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollBar; public class Main extends JPanel { 

 JLabel label = new JLabel();
 public Main() {
   setLayout(new BorderLayout());
   JScrollBar hbar = new JScrollBar(JScrollBar.HORIZONTAL, 30, 20, 0, 300);
   JScrollBar vbar = new JScrollBar(JScrollBar.VERTICAL, 30, 40, 0, 300);
   hbar.setUnitIncrement(2);
   hbar.setBlockIncrement(1);
   hbar.addAdjustmentListener(new MyAdjustmentListener());
   vbar.addAdjustmentListener(new MyAdjustmentListener());
   add(hbar, BorderLayout.SOUTH);
   add(vbar, BorderLayout.EAST);
   add(label, BorderLayout.CENTER);
 }
 public static void main(String s[]) {
   JFrame frame = new JFrame("Scroll Bar Example");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setContentPane(new Main());
   frame.setSize(200, 200);
   frame.setVisible(true);
 }

} class MyAdjustmentListener implements AdjustmentListener { 

 public void adjustmentValueChanged(AdjustmentEvent e) {
   System.out.println("    New Value is " + e.getValue() + "      ");
 }

} 

 </source>



Variations on a text and icon label

   <source lang="java">

import java.awt.Color; import java.awt.Container; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingConstants; public class ImageLabelExample { 

 private static Icon icon = new ImageIcon("1.gif");
 public static void main(String[] args) {
   JLabel[] labels = new JLabel[9];
   labels[0] = makeLabel(JLabel.TOP, JLabel.LEFT);
   labels[1] = makeLabel(JLabel.TOP, JLabel.CENTER);
   labels[2] = makeLabel(JLabel.TOP, JLabel.RIGHT);
   labels[3] = makeLabel(JLabel.CENTER, JLabel.LEFT);
   labels[4] = makeLabel(JLabel.CENTER, JLabel.CENTER);
   labels[5] = makeLabel(JLabel.CENTER, JLabel.RIGHT);
   labels[6] = makeLabel(JLabel.BOTTOM, JLabel.LEFT);
   labels[7] = makeLabel(JLabel.BOTTOM, JLabel.CENTER);
   labels[8] = makeLabel(JLabel.BOTTOM, JLabel.RIGHT);
   labels[0].setEnabled(false);
   labels[1].setDisabledIcon(new ImageIcon("2.gif"));
   labels[1].setEnabled(false);
   labels[2].setIconTextGap(15);
   labels[3].setIconTextGap(0);
   JFrame frame = new JFrame();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container c = frame.getContentPane();
   c.setLayout(new FlowLayout(FlowLayout.CENTER, 3, 3));
   for (int i = 0; i < 9; i++)
     c.add(labels[i]);
   frame.setSize(350, 150);
   frame.setVisible(true);
 }
 protected static JLabel makeLabel(int vert, int horiz) {
   JLabel l = new JLabel("Smile", icon, SwingConstants.CENTER);
   l.setVerticalTextPosition(vert);
   l.setHorizontalTextPosition(horiz);
   l.setBorder(BorderFactory.createLineBorder(Color.black));
   return l;
 }

} 


 </source>



Vertical Alignment: BOTTOM

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("asdf");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   label.setPreferredSize(new Dimension(150, 100));
   
   label.setText("Bottom Right");
   label.setHorizontalAlignment(JLabel.RIGHT);
   label.setVerticalAlignment(JLabel.BOTTOM);
   
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



Vertical Alignment: CENTER

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("asdf");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   label.setPreferredSize(new Dimension(150, 100));
   
   label.setText("Centered");
   label.setHorizontalAlignment(JLabel.CENTER);
   label.setVerticalAlignment(JLabel.CENTER);
   
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>



Vertical Alignment: TOP

   <source lang="java">

import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.border.Border; public class Main { 

 public static void main(String args[]) {
   JFrame f = new JFrame("Label Demo");
   f.setLayout(new FlowLayout());
   f.setSize(200, 360);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   JLabel label= new JLabel("asdf");
   Border border = BorderFactory.createLineBorder(Color.BLACK);
   label.setBorder(border);
   label.setPreferredSize(new Dimension(150, 100));
   
   label.setText("Top Left");
   label.setHorizontalAlignment(JLabel.LEFT);
   label.setVerticalAlignment(JLabel.TOP);
   
   f.add(label);
   f.setVisible(true);
 }

} 

 </source>

Источник — «http://jexp.ru/index.php?title=Java/Swing_JFC/Label&oldid=7411»