对话框

//copyright©liupengcheng
//http://www.cnblogs.com/liupengcheng

addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } });

/**
* Created by Administrator on 2014/11/4.
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

class TestJDialog {
    public static void main(String [] args){
        JOptionPane.showMessageDialog(null,"程序开始启动");
        final JFrame f = new JFrame("TestJDialog");
        f.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);

        f.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                int retval = JOptionPane.showConfirmDialog(f,"你真的要结束吗？"
                        ,"结束程序",JOptionPane.YES_NO_OPTION);
                if (retval == JOptionPane.YES_OPTION)
                    System.exit(0);
            }
        });
        f.setSize(200,200);
        f.setVisible(true);
    }
}