JOptionPane对话框的使用
import java.awt.event.*; import javax.swing.*;class MyFrame extends JFrame{ JButton b1; public static void main(String args[]) { MyFrame f = new MyFrame(); } public MyFrame() { /* super() method is used to invoke the base class constructor */ super("Window Title"); b1=new JButton("Click Here"); getContentPane().add("Center",b1); //Register the listener for the button ButtonListener blisten= new ButtonListener(); b1.addActionListener(blisten); setSize(200,200); setVisible(true); } //The Listener class class ButtonListener implements ActionListener { public void actionPerformed(ActionEvent evt) { JButton source = (JButton)evt.getSource(); source.setText("Button clicked"); JOptionPane.showMessageDialog(MyFrame.this,"Button
clicked","information",JOptionPane.INFORMATION_MESSAGE); } }}
