JButton演示操作
import javax.swing.*;import java.awt.Toolkit;import java.awt.event.*;import java.awt.*;/** * Title:JButton操作 * Description:演示按钮的事件响应和按钮的实效 * @author fan * */public class MyButtonDemo extends JFrame implements ActionListener{/** **/private static final long serialVersionUID = 1L;/** * 定义三个按钮 */private JButton b1, b2, b3;/** * 定义ImageIcon对象用于图标对象 */private ImageIcon rightImage, middleImage, leftImage;/** * 定义一个面板 */private JPanel contentPane =new JPanel();/** * 方法说明：构造方法 */public MyButtonDemo(){leftImage = createImageIcon("base2011/images/left.gif");middleImage = createImageIcon("base2011/images/middle.gif");rightImage = createImageIcon("base2011/images/right.gif");//构建窗体this.lunchFrame("ButtonDemo");}/** * 构建窗体 */private void lunchFrame(String title){b1 = new JButton("失效中间按钮", leftImage);b1.setVerticalTextPosition(AbstractButton.CENTER);b1.setHorizontalTextPosition(AbstractButton.LEADING);b1.setMnemonic(KeyEvent.VK_D);b1.setActionCommand("Disable");b1.setToolTipText("点击此按钮时中间按钮失效");b1.addActionListener(this);b2 = new JButton("中间按钮", middleImage);b2.setVerticalTextPosition(AbstractButton.BOTTOM);b2.setHorizontalTextPosition(AbstractButton.LEADING);b2.setMnemonic(KeyEvent.VK_M);b2.setToolTipText("点击此按钮无任何事件发生");b3 = new JButton("激活中间按钮", rightImage);b3.setHorizontalTextPosition(AbstractButton.LEADING);b3.setVerticalTextPosition(AbstractButton.CENTER);b3.setMnemonic(KeyEvent.VK_E);b3.setToolTipText("点击此按钮使中间按钮激活");b3.setActionCommand("Enable");b3.setEnabled(false);b3.addActionListener(this);contentPane.add(b1);contentPane.add(b2);contentPane.add(b3);contentPane.setOpaque(false);//绘制边界内所有元素this.setContentPane(contentPane);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setVisible(true);this.setTitle(title);this.pack();//将窗体定义到屏幕中间位置this.setCenterLocation();JFrame.setDefaultLookAndFeelDecorated(false);}/** * 方法说明：创建图标对象 * @param path 图片的存放路径 * @return ImageIcon */protected static ImageIcon createImageIcon(String path){ImageIcon image = null;try{java.net.URL imgURL = MyButtonDemo.class.getClassLoader().getResource(path);if(imgURL != null){image = new ImageIcon(imgURL);}else{System.err.println("could not find file: "+path);}}catch(Exception e){e.printStackTrace();}if(image != null){return image;}else{return null;}}/** * 方法说明：将窗体定位到屏幕中间 */public void setCenterLocation(){Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();int w = this.getSize().width;int h = this.getSize().height;System.out.println("宽度: "+w+" ,高度:"+h);int x = (dim.width - w)/2;int y = (dim.height - h)/2;this.setLocation(x, y);}/** * 方法说明：事件处理 */@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubif("Disable".equals(e.getActionCommand())){b1.setEnabled(false);b2.setEnabled(false);b3.setEnabled(true);}else{b1.setEnabled(true);b2.setEnabled(true);b3.setEnabled(false);}}/** * 方法说明：主方法 * @param args */public static void main(String[] args){new MyButtonDemo();}}
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