Java by API/javax.swing/JLabel

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extends JLabel

 
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class ImageTest {
  public static void main(String[] args) {
    JPanel panel = new JPanel();
    ImageLabel label = new ImageLabel(new ImageIcon("images/reactor.png"));
    label.setLocation(29, 37);
    panel.add(label);
    JFrame frame = new JFrame();
    frame.getContentPane().add(panel);
    frame.pack();
    frame.setVisible(true);
  }
}
class ImageLabel extends JLabel {
  public ImageLabel(String img) {
    this(new ImageIcon(img));
  }
  public ImageLabel(ImageIcon icon) {
    setIcon(icon);
    // setMargin(new Insets(0,0,0,0));
    setIconTextGap(0);
    // setBorderPainted(false);
    setBorder(null);
    setText(null);
    setSize(icon.getImage().getWidth(null), icon.getImage().getHeight(null));
  }
}





JLabel: addMouseMotionListener(MouseMotionListener l)

 

import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
class CustomListener implements MouseMotionListener {
  public void mouseMoved(MouseEvent me) {
    System.out.println("mouseMoved");
  }
  public void mouseDragged(MouseEvent me) {
    System.out.println("mouseDragged");
  }
}
public class Main {
  public static void main(String[] a) {
    JFrame frame = new JFrame("Popup JComboBox");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JLabel label = new JLabel();
    label.addMouseMotionListener(new CustomListener() {
    });
    frame.add(label);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





JLabel.BOTTOM

 
import java.awt.GridLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.metal.MetalIconFactory;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Label Text Pos");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(2, 2));
    Border border = LineBorder.createGrayLineBorder();
    Icon warnIcon = MetalIconFactory.getTreeComputerIcon();
    JLabel label1 = new JLabel(warnIcon);
    label1.setText("Left-Bottom");
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setBorder(border);
    frame.add(label1);
    JLabel label2 = new JLabel(warnIcon);
    label2.setText("Right-TOP");
    label2.setHorizontalTextPosition(JLabel.RIGHT);
    label2.setVerticalTextPosition(JLabel.TOP);
    label2.setBorder(border);
    frame.add(label2);
    JLabel label3 = new JLabel(warnIcon);
    label3.setText("Center-Center");
    label3.setHorizontalTextPosition(JLabel.CENTER);
    label3.setVerticalTextPosition(JLabel.CENTER);
    label3.setBorder(border);
    frame.add(label3);
    JLabel label4 = new JLabel(warnIcon);
    label4.setText("Center-Bottom");
    label4.setHorizontalTextPosition(JLabel.CENTER);
    label4.setVerticalTextPosition(JLabel.BOTTOM);
    label4.setBorder(border);
    frame.add(label4);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





JLabel.CENTER

 
import java.awt.GridLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.metal.MetalIconFactory;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Label Text Pos");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(2, 2));
    Border border = LineBorder.createGrayLineBorder();
    Icon warnIcon = MetalIconFactory.getTreeComputerIcon();
    JLabel label1 = new JLabel(warnIcon);
    label1.setText("Left-Bottom");
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setBorder(border);
    frame.add(label1);
    JLabel label2 = new JLabel(warnIcon);
    label2.setText("Right-TOP");
    label2.setHorizontalTextPosition(JLabel.RIGHT);
    label2.setVerticalTextPosition(JLabel.TOP);
    label2.setBorder(border);
    frame.add(label2);
    JLabel label3 = new JLabel(warnIcon);
    label3.setText("Center-Center");
    label3.setHorizontalTextPosition(JLabel.CENTER);
    label3.setVerticalTextPosition(JLabel.CENTER);
    label3.setBorder(border);
    frame.add(label3);
    JLabel label4 = new JLabel(warnIcon);
    label4.setText("Center-Bottom");
    label4.setHorizontalTextPosition(JLabel.CENTER);
    label4.setVerticalTextPosition(JLabel.BOTTOM);
    label4.setBorder(border);
    frame.add(label4);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





JLabel: getTransferHandler()

 

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Image;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.TransferHandler;
public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Clip Image");
    Container contentPane = frame.getContentPane();
    final Clipboard clipboard = frame.getToolkit().getSystemClipboard();
    Icon icon = new ImageIcon("jaeger.jpg");
    final JLabel label = new JLabel(icon);
    label.setTransferHandler(new ImageSelection());
    JScrollPane pane = new JScrollPane(label);
    contentPane.add(pane, BorderLayout.CENTER);
    JButton copy = new JButton("Copy");
    copy.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        TransferHandler handler = label.getTransferHandler();
        handler.exportToClipboard(label, clipboard,
            TransferHandler.COPY);
      }
    });
    JButton clear = new JButton("Clear");
    clear.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        label.setIcon(null);
      }
    });
    JButton paste = new JButton("Paste");
    paste.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        Transferable clipData = clipboard.getContents(clipboard);
        if (clipData != null) {
          if (clipData.isDataFlavorSupported(DataFlavor.imageFlavor)) {
            TransferHandler handler = label.getTransferHandler();
            handler.importData(label, clipData);
          }
        }
      }
    });
    JPanel p = new JPanel();
    p.add(copy);
    p.add(clear);
    p.add(paste);
    contentPane.add(p, BorderLayout.SOUTH);
    frame.setSize(300, 300);
    frame.show();
  }
}
class ImageSelection extends TransferHandler implements Transferable {
  private static final DataFlavor flavors[] = { DataFlavor.imageFlavor };
  private JLabel source;
  private Image image;
  public int getSourceActions(JComponent c) {
    return TransferHandler.COPY;
  }
  public boolean canImport(JComponent comp, DataFlavor flavor[]) {
    if (!(comp instanceof JLabel)) {
      return false;
    }
    for (int i = 0, n = flavor.length; i < n; i++) {
      for (int j = 0, m = flavors.length; j < m; j++) {
        if (flavor[i].equals(flavors[j])) {
          return true;
        }
      }
    }
    return false;
  }
  public Transferable createTransferable(JComponent comp) {
    // Clear
    source = null;
    image = null;
    if (comp instanceof JLabel) {
      JLabel label = (JLabel) comp;
      Icon icon = label.getIcon();
      if (icon instanceof ImageIcon) {
        image = ((ImageIcon) icon).getImage();
        source = label;
        return this;
      }
    }
    return null;
  }
  public boolean importData(JComponent comp, Transferable t) {
    if (comp instanceof JLabel) {
      JLabel label = (JLabel) comp;
      if (t.isDataFlavorSupported(flavors[0])) {
        try {
          image = (Image) t.getTransferData(flavors[0]);
          ImageIcon icon = new ImageIcon(image);
          label.setIcon(icon);
          return true;
        } catch (UnsupportedFlavorException ignored) {
        } catch (IOException ignored) {
        }
      }
    }
    return false;
  }
  // Transferable
  public Object getTransferData(DataFlavor flavor) {
    if (isDataFlavorSupported(flavor)) {
      return image;
    }
    return null;
  }
  public DataFlavor[] getTransferDataFlavors() {
    return flavors;
  }
  public boolean isDataFlavorSupported(DataFlavor flavor) {
    return flavor.equals(DataFlavor.imageFlavor);
  }
}





JLabel.LEFT

 
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public MainClass() {
    JLabel lblMarried = new JLabel("Are you married?", JLabel.LEFT);
    JLabel lblGolf = new JLabel("Do you play golf?", JLabel.RIGHT);
    
    add(lblMarried);
    add(lblGolf);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}





JLabel.RIGHT

 
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public MainClass() {
    JLabel lblMarried = new JLabel("Are you married?", JLabel.LEFT);
    JLabel lblGolf = new JLabel("Do you play golf?", JLabel.RIGHT);
    
    add(lblMarried);
    add(lblGolf);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}





JLabel: setBoder(Border border)

 
import java.awt.GridLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.metal.MetalIconFactory;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Label Text Pos");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(2, 2));
    Border border = LineBorder.createGrayLineBorder();
    Icon warnIcon = MetalIconFactory.getTreeComputerIcon();
    JLabel label1 = new JLabel(warnIcon);
    label1.setText("Left-Bottom");
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setBorder(border);
    frame.add(label1);
    JLabel label2 = new JLabel(warnIcon);
    label2.setText("Right-TOP");
    label2.setHorizontalTextPosition(JLabel.RIGHT);
    label2.setVerticalTextPosition(JLabel.TOP);
    label2.setBorder(border);
    frame.add(label2);
    JLabel label3 = new JLabel(warnIcon);
    label3.setText("Center-Center");
    label3.setHorizontalTextPosition(JLabel.CENTER);
    label3.setVerticalTextPosition(JLabel.CENTER);
    label3.setBorder(border);
    frame.add(label3);
    JLabel label4 = new JLabel(warnIcon);
    label4.setText("Center-Bottom");
    label4.setHorizontalTextPosition(JLabel.CENTER);
    label4.setVerticalTextPosition(JLabel.BOTTOM);
    label4.setBorder(border);
    frame.add(label4);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





JLabel: setBounds(int x, int y, int width, int height)

 
import java.awt.Color;
import java.awt.FlowLayout;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class Main extends JFrame {
  public Main() {
    super("JLayeredPane Demo");
    setSize(256, 256);
    JPanel content = new JPanel();
    content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));
    content.setOpaque(false);
    JLabel label1 = new JLabel("Username:");
    label1.setForeground(Color.white);
    content.add(label1);
    JTextField field = new JTextField(15);
    content.add(field);
    JLabel label2 = new JLabel("Password:");
    label2.setForeground(Color.white);
    content.add(label2);
    JPasswordField fieldPass = new JPasswordField(15);
    content.add(fieldPass);
    setLayout(new FlowLayout());
    add(content);
    ((JPanel) getContentPane()).setOpaque(false);
    ImageIcon earth = new ImageIcon("largejexpLogo.png");
    JLabel backlabel = new JLabel(earth);
    getLayeredPane().add(backlabel, new Integer(Integer.MIN_VALUE));
    backlabel.setBounds(0, 0, earth.getIconWidth(), earth.getIconHeight());
    super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
  }
  public static void main(String[] args) {
    new Main();
  }
}





JLabel: setDisplayedMnemonicIndex(int index)

 

import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Main {
  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);
  }
}





JLabel: setDisplayedMnemonic(int key) (KeyEvent.VK_U)

 
import java.awt.BorderLayout;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class MainClass {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("Password Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel userPanel = new JPanel(new BorderLayout());
    JLabel userLabel = new JLabel("Username: ");
    userLabel.setDisplayedMnemonic(KeyEvent.VK_U);
    JTextField userTextField = new JTextField();
    userLabel.setLabelFor(userTextField);
    userPanel.add(userLabel, BorderLayout.WEST);
    userPanel.add(userTextField, BorderLayout.CENTER);
    JPanel passPanel = new JPanel(new BorderLayout());
    JLabel passLabel = new JLabel("Password: ");
    passLabel.setDisplayedMnemonic(KeyEvent.VK_P);
    JPasswordField passTextField = new JPasswordField();
    passLabel.setLabelFor(passTextField);
    passPanel.add(passLabel, BorderLayout.WEST);
    passPanel.add(passTextField, BorderLayout.CENTER);
    JPanel panel = new JPanel(new BorderLayout());
    panel.add(userPanel, BorderLayout.NORTH);
    panel.add(passPanel, BorderLayout.SOUTH);
    frame.add(panel, BorderLayout.NORTH);
    frame.setSize(250, 150);
    frame.setVisible(true);
  }
}





JLabel: setHorizontalTextPosition(int align)

 
import java.awt.GridLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.metal.MetalIconFactory;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Label Text Pos");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(2, 2));
    Border border = LineBorder.createGrayLineBorder();
    Icon warnIcon = MetalIconFactory.getTreeComputerIcon();
    JLabel label1 = new JLabel(warnIcon);
    label1.setText("Left-Bottom");
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setBorder(border);
    frame.add(label1);
    JLabel label2 = new JLabel(warnIcon);
    label2.setText("Right-TOP");
    label2.setHorizontalTextPosition(JLabel.RIGHT);
    label2.setVerticalTextPosition(JLabel.TOP);
    label2.setBorder(border);
    frame.add(label2);
    JLabel label3 = new JLabel(warnIcon);
    label3.setText("Center-Center");
    label3.setHorizontalTextPosition(JLabel.CENTER);
    label3.setVerticalTextPosition(JLabel.CENTER);
    label3.setBorder(border);
    frame.add(label3);
    JLabel label4 = new JLabel(warnIcon);
    label4.setText("Center-Bottom");
    label4.setHorizontalTextPosition(JLabel.CENTER);
    label4.setVerticalTextPosition(JLabel.BOTTOM);
    label4.setBorder(border);
    frame.add(label4);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





JLabel: setIcon(Icon icon)

 
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class ImageTest {
  public static void main(String[] args) {
    JPanel panel = new JPanel();
    ImageLabel label = new ImageLabel(new ImageIcon("images/reactor.png"));
    label.setLocation(29, 37);
    panel.add(label);
    JFrame frame = new JFrame();
    frame.getContentPane().add(panel);
    frame.pack();
    frame.setVisible(true);
  }
}
class ImageLabel extends JLabel {
  public ImageLabel(String img) {
    this(new ImageIcon(img));
  }
  public ImageLabel(ImageIcon icon) {
    setIcon(icon);
    // setMargin(new Insets(0,0,0,0));
    setIconTextGap(0);
    // setBorderPainted(false);
    setBorder(null);
    setText(null);
    setSize(icon.getImage().getWidth(null), icon.getImage().getHeight(null));
  }
}





JLabel: setLabelFor(Component c)

 
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 MainClass {
  public static void main(String[] a) {
    JFrame frame = new JFrame("LabelFor Sample");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    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);
    frame.add(box, BorderLayout.NORTH);
    frame.add(new JButton("Submit"), BorderLayout.SOUTH);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





JLabel: setOpaque(boolean isOpaque)

 
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 Main extends JFrame {
  public Main() {
    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 Main();
  }
}





JLabel: setPreferredSize(Dimension preferredSize)

 
/* 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.BorderLayout;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
/* FrameDemo.java requires no other files. */
public class Main {
  /**
   * Create the GUI and show it. For thread safety, this method should be
   * invoked from the event-dispatching thread.
   */
  private static void createAndShowGUI() {
    //Suggest that the L&F (rather than the system)
    //decorate all windows. This must be invoked before
    //creating the JFrame. Native look and feels will
    //ignore this hint.
    JFrame.setDefaultLookAndFeelDecorated(true);
    //Create and set up the window.
    JFrame frame = new JFrame("FrameDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JLabel emptyLabel = new JLabel("");
    emptyLabel.setPreferredSize(new Dimension(175, 100));
    frame.add(emptyLabel, BorderLayout.CENTER);
    //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();
      }
    });
  }
}





JLabel: setText(String str)

 
import java.awt.GridLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.metal.MetalIconFactory;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Label Text Pos");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(2, 2));
    Border border = LineBorder.createGrayLineBorder();
    Icon warnIcon = MetalIconFactory.getTreeComputerIcon();
    JLabel label1 = new JLabel(warnIcon);
    label1.setText("Left-Bottom");
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setBorder(border);
    frame.add(label1);
    JLabel label2 = new JLabel(warnIcon);
    label2.setText("Right-TOP");
    label2.setHorizontalTextPosition(JLabel.RIGHT);
    label2.setVerticalTextPosition(JLabel.TOP);
    label2.setBorder(border);
    frame.add(label2);
    JLabel label3 = new JLabel(warnIcon);
    label3.setText("Center-Center");
    label3.setHorizontalTextPosition(JLabel.CENTER);
    label3.setVerticalTextPosition(JLabel.CENTER);
    label3.setBorder(border);
    frame.add(label3);
    JLabel label4 = new JLabel(warnIcon);
    label4.setText("Center-Bottom");
    label4.setHorizontalTextPosition(JLabel.CENTER);
    label4.setVerticalTextPosition(JLabel.BOTTOM);
    label4.setBorder(border);
    frame.add(label4);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





JLabel: setToolTipText(String text)

 
 
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);
  }
}





JLabel: setVerticalAlignment(int alignment)

 
 
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);
  }
}





JLabel: setVerticalTextPosition(int align)

 
import java.awt.GridLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.metal.MetalIconFactory;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Label Text Pos");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(2, 2));
    Border border = LineBorder.createGrayLineBorder();
    Icon warnIcon = MetalIconFactory.getTreeComputerIcon();
    JLabel label1 = new JLabel(warnIcon);
    label1.setText("Left-Bottom");
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setBorder(border);
    frame.add(label1);
    JLabel label2 = new JLabel(warnIcon);
    label2.setText("Right-TOP");
    label2.setHorizontalTextPosition(JLabel.RIGHT);
    label2.setVerticalTextPosition(JLabel.TOP);
    label2.setBorder(border);
    frame.add(label2);
    JLabel label3 = new JLabel(warnIcon);
    label3.setText("Center-Center");
    label3.setHorizontalTextPosition(JLabel.CENTER);
    label3.setVerticalTextPosition(JLabel.CENTER);
    label3.setBorder(border);
    frame.add(label3);
    JLabel label4 = new JLabel(warnIcon);
    label4.setText("Center-Bottom");
    label4.setHorizontalTextPosition(JLabel.CENTER);
    label4.setVerticalTextPosition(JLabel.BOTTOM);
    label4.setBorder(border);
    frame.add(label4);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





JLabel.TOP

 
import java.awt.GridLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.metal.MetalIconFactory;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Label Text Pos");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(2, 2));
    Border border = LineBorder.createGrayLineBorder();
    Icon warnIcon = MetalIconFactory.getTreeComputerIcon();
    JLabel label1 = new JLabel(warnIcon);
    label1.setText("Left-Bottom");
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setBorder(border);
    frame.add(label1);
    JLabel label2 = new JLabel(warnIcon);
    label2.setText("Right-TOP");
    label2.setHorizontalTextPosition(JLabel.RIGHT);
    label2.setVerticalTextPosition(JLabel.TOP);
    label2.setBorder(border);
    frame.add(label2);
    JLabel label3 = new JLabel(warnIcon);
    label3.setText("Center-Center");
    label3.setHorizontalTextPosition(JLabel.CENTER);
    label3.setVerticalTextPosition(JLabel.CENTER);
    label3.setBorder(border);
    frame.add(label3);
    JLabel label4 = new JLabel(warnIcon);
    label4.setText("Center-Bottom");
    label4.setHorizontalTextPosition(JLabel.CENTER);
    label4.setVerticalTextPosition(JLabel.BOTTOM);
    label4.setBorder(border);
    frame.add(label4);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





new JLabel(Icon icon)

 
import java.awt.GridLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.plaf.metal.MetalIconFactory;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Label Text Pos");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(2, 2));
    Border border = LineBorder.createGrayLineBorder();
    Icon warnIcon = MetalIconFactory.getTreeComputerIcon();
    JLabel label1 = new JLabel(warnIcon);
    label1.setText("Left-Bottom");
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setBorder(border);
    frame.add(label1);
    JLabel label2 = new JLabel(warnIcon);
    label2.setText("Right-TOP");
    label2.setHorizontalTextPosition(JLabel.RIGHT);
    label2.setVerticalTextPosition(JLabel.TOP);
    label2.setBorder(border);
    frame.add(label2);
    JLabel label3 = new JLabel(warnIcon);
    label3.setText("Center-Center");
    label3.setHorizontalTextPosition(JLabel.CENTER);
    label3.setVerticalTextPosition(JLabel.CENTER);
    label3.setBorder(border);
    frame.add(label3);
    JLabel label4 = new JLabel(warnIcon);
    label4.setText("Center-Bottom");
    label4.setHorizontalTextPosition(JLabel.CENTER);
    label4.setVerticalTextPosition(JLabel.BOTTOM);
    label4.setBorder(border);
    frame.add(label4);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





new JLabel(Icon i, int alignment)

 
import java.awt.ruponent;
import java.awt.Graphics;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public MainClass() {
    JLabel jl = new JLabel( new MyIcon(), JLabel.CENTER);
    add(jl);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}
class MyIcon implements Icon {
  public int getIconWidth() {
    return 32;
  }
  public int getIconHeight() {
    return 32;
  }
  public void paintIcon(Component c, Graphics g, int x, int y) {
    g.drawString("jexp.ru", 0, 20);
  }
}





new JLabel(String htmlString) (Multi-line Label)

 
import javax.swing.JFrame;
import javax.swing.JLabel;
public class MainClass {
  public static void main(String[] a) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    String htmlLabel = "<html><sup>HTML</sup> <sub><em>Label</em></sub><br>"
        + "<font color=\"#FF0080\"><u>Multi-line</u></font>";
    JLabel label = new JLabel(htmlLabel);
    frame.add(label);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}





new JLabel(String text, Icon icon, int horizontalAlignment)

 
import java.awt.FlowLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
public class Main {
  public static void main(String[] args) {
    JFrame.setDefaultLookAndFeelDecorated(true);
    JFrame frame = new JFrame();
    frame.setTitle("JLabel Test");
    frame.setLayout(new FlowLayout());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    ImageIcon imageIcon = new ImageIcon("yourFile.gif");
    JLabel label = new JLabel("Mixed", imageIcon, SwingConstants.RIGHT);
    frame.add(label);
    frame.pack();
    frame.setVisible(true);
  }
}





new JLabel(String text, int horizontalAlignment)

 
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Main {
  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);
  }
}


Источник — «http://jexp.ru/index.php?title=Java_by_API/javax.swing/JLabel&oldid=761»