joptiondemo.java

这个是Java的swing相关的典型的源码

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

/**
 * Demonstrate JOptionPane
 * 
 * @author Ian Darwin
 */
public class JOptionDemo extends JFrame {

  // Constructor
  JOptionDemo(String s) {
    super(s);

    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());

    JButton b = new JButton("Give me a message");
    b.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        JOptionPane.showMessageDialog(JOptionDemo.this,
            "This is your message: etaoin shrdlu", "Coded Message",
            JOptionPane.INFORMATION_MESSAGE);
      }
    });
    cp.add(b);

    b = new JButton("Goodbye!");
    b.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        System.exit(0);
      }
    });
    cp.add(b);

    // size the main window
    pack();
  }

  public static void main(String[] arg) {
    JOptionDemo x = new JOptionDemo("Testing 1 2 3...");
    x.setVisible(true);
  }
}