📄 buttonhtmldemo.java
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import java.awt.*;import java.awt.event.*;import javax.swing.AbstractButton;import javax.swing.JButton;import javax.swing.JPanel;import javax.swing.JFrame;import javax.swing.ImageIcon;/* * ButtonHtmlDemo.java is a 1.4 application that uses the following files: * images/right.gif * images/middle.gif * images/left.gif */public class ButtonHtmlDemo extends JPanel implements ActionListener { protected JButton b1, b2, b3; public ButtonHtmlDemo() { ImageIcon leftButtonIcon = createImageIcon("images/right.gif"); ImageIcon middleButtonIcon = createImageIcon("images/middle.gif"); ImageIcon rightButtonIcon = createImageIcon("images/left.gif"); b1 = new JButton("<html><center><b><u>D</u>isable</b><br>" + "<font color=#ffffdd>middle button</font>", leftButtonIcon); Font font = b1.getFont().deriveFont(Font.PLAIN); b1.setFont(font); b1.setVerticalTextPosition(AbstractButton.CENTER); b1.setHorizontalTextPosition(AbstractButton.LEADING); //aka LEFT, for left-to-right locales b1.setMnemonic(KeyEvent.VK_D); b1.setActionCommand("disable"); b2 = new JButton("middle button", middleButtonIcon); b2.setFont(font); b2.setForeground(new Color(0xffffdd)); b2.setVerticalTextPosition(AbstractButton.BOTTOM); b2.setHorizontalTextPosition(AbstractButton.CENTER); b2.setMnemonic(KeyEvent.VK_M); b3 = new JButton("<html><center><b><u>E</u>nable</b><br>" + "<font color=#ffffdd>middle button</font>", rightButtonIcon); b3.setFont(font); //Use the default text position of CENTER, TRAILING (RIGHT). b3.setMnemonic(KeyEvent.VK_E); b3.setActionCommand("enable"); b3.setEnabled(false); //Listen for actions on buttons 1 and 3. b1.addActionListener(this); b3.addActionListener(this); b1.setToolTipText("Click this button to disable the middle button."); b2.setToolTipText("This middle button does nothing when you click it."); b3.setToolTipText("Click this button to enable the middle button."); //Add Components to this container, using the default FlowLayout. add(b1); add(b2); add(b3); } public void actionPerformed(ActionEvent e) { if ("disable".equals(e.getActionCommand())) { b2.setEnabled(false); b1.setEnabled(false); b3.setEnabled(true); } else { b2.setEnabled(true); b1.setEnabled(true); b3.setEnabled(false); } } /** Returns an ImageIcon, or null if the path was invalid. */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = ButtonHtmlDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } 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("ButtonHtmlDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. ButtonHtmlDemo newContentPane = new ButtonHtmlDemo(); 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(); } }); }}⌨️ 快捷键说明
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