Java by API/javax.swing/JLabel
Содержание
- 1 extends JLabel
- 2 JLabel: addMouseMotionListener(MouseMotionListener l)
- 3 JLabel.BOTTOM
- 4 JLabel.CENTER
- 5 JLabel: getTransferHandler()
- 6 JLabel.LEFT
- 7 JLabel.RIGHT
- 8 JLabel: setBoder(Border border)
- 9 JLabel: setBounds(int x, int y, int width, int height)
- 10 JLabel: setDisplayedMnemonicIndex(int index)
- 11 JLabel: setDisplayedMnemonic(int key) (KeyEvent.VK_U)
- 12 JLabel: setHorizontalTextPosition(int align)
- 13 JLabel: setIcon(Icon icon)
- 14 JLabel: setLabelFor(Component c)
- 15 JLabel: setOpaque(boolean isOpaque)
- 16 JLabel: setPreferredSize(Dimension preferredSize)
- 17 JLabel: setText(String str)
- 18 JLabel: setToolTipText(String text)
- 19 JLabel: setVerticalAlignment(int alignment)
- 20 JLabel: setVerticalTextPosition(int align)
- 21 JLabel.TOP
- 22 new JLabel(Icon icon)
- 23 new JLabel(Icon i, int alignment)
- 24 new JLabel(String htmlString) (Multi-line Label)
- 25 new JLabel(String text, Icon icon, int horizontalAlignment)
- 26 new JLabel(String text, int horizontalAlignment)
extends JLabel
<source lang="java">
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));
}
}
</source>
JLabel: addMouseMotionListener(MouseMotionListener l)
<source lang="java">
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);
}
}
</source>
JLabel.BOTTOM
<source lang="java">
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);
}
}
</source>
JLabel.CENTER
<source lang="java">
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);
}
}
</source>
JLabel: getTransferHandler()
<source lang="java">
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);
}
}
</source>
JLabel.LEFT
<source lang="java">
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);
}
}
</source>
JLabel.RIGHT
<source lang="java">
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);
}
}
</source>
JLabel: setBoder(Border border)
<source lang="java">
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);
}
}
</source>
JLabel: setBounds(int x, int y, int width, int height)
<source lang="java">
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();
}
}
</source>
JLabel: setDisplayedMnemonicIndex(int index)
<source lang="java">
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);
}
}
</source>
JLabel: setDisplayedMnemonic(int key) (KeyEvent.VK_U)
<source lang="java">
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);
}
}
</source>
JLabel: setHorizontalTextPosition(int align)
<source lang="java">
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);
}
}
</source>
JLabel: setIcon(Icon icon)
<source lang="java">
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));
}
}
</source>
JLabel: setLabelFor(Component c)
<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 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);
}
}
</source>
JLabel: setOpaque(boolean isOpaque)
<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 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();
}
}
</source>
JLabel: setPreferredSize(Dimension preferredSize)
<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.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();
}
});
}
}
</source>
JLabel: setText(String str)
<source lang="java">
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);
}
}
</source>
JLabel: setToolTipText(String text)
<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>
JLabel: setVerticalAlignment(int alignment)
<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>
JLabel: setVerticalTextPosition(int align)
<source lang="java">
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);
}
}
</source>
JLabel.TOP
<source lang="java">
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);
}
}
</source>
new JLabel(Icon icon)
<source lang="java">
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);
}
}
</source>
new JLabel(Icon i, int alignment)
<source lang="java">
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);
}
}
</source>
new JLabel(String htmlString) (Multi-line Label)
<source lang="java">
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>HTML Label
"
+ "Multi-line";
JLabel label = new JLabel(htmlLabel);
frame.add(label);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
</source>
new JLabel(String text, Icon icon, int horizontalAlignment)
<source lang="java">
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);
}
}
</source>
new JLabel(String text, int horizontalAlignment)
<source lang="java">
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);
}
}
</source>
