应用Swing组件的Applet.docVIP

应用Swing组件的Applet import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Ex9_4 extends JApplet{ public void init() { Container contentPane=getContentPane(); contentPane.setLayout(new GridLayout(2,1)); JButton button=new JButton(Click me); final JLabel label=new JLabel(); contentPane.add(button); contentPane.add(label); button.addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent event) { String information=JOptionPane.showInputDialog(请输入一串字符); label.setText(information); } } );//创建监听器语句结束 }//init方法结束 } 把JApplet换成JFrame，将例9-4的程序改为Application Jframe的例子1 import java.awt.*; //导入AWT包的所有组件类 import javax.swing.*; import java.awt.*; public class Exa_9_2{ public static void main(String[] args){ JFrame app=new JFrame(JFrame Usage Demo-2); //创建窗口对象 app.getContentPane().setLayout(new GridLayout(2,1)); //设置内容窗格布局 JLabel jlblInfo= new JLabel(这是一个能够响应关闭操作的程序); app.getContentPane().add(jlblInfo); app.getContentPane().add(new JButton(这是一个Swing按钮)); app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //响应关闭操作 app.pack(); //按紧缩窗口尺寸显示窗口 app.setVisible(true); //使窗口对象可见 } } 2、Jframe的例子2 import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Ex9_5{ public static void main(String[] args){ JFrame f=new JFrame(揝imple Swing Application?; Container contentPane=f.getContentPane(); n contentPane.setLayout(new GridLayout(2,1)); JButton button=new JButton(Click me); final JLabel label=new JLabel(); contentPane.add(button);//添加按钮 contentPane.add(label);//添加标签 button.addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent event) { String information=JOptionPane.showInputDialog(请输入一串字符); label.setText(information); } } );