java单击按钮 java点击按钮弹出窗口

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用到JOptionPane.showConfirmDialog方法，showConfirmDialog 的返回32313133353236313431303231363533e4b893e5b19e31333337626161类型是int,定义一个int类型的变量接收返回值，然后根据业务逻辑判断，代码看不懂，可以自行百度搜索或问同事，编程注重思想。import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class JButtonTest extends JFrame
{
public static void main ( String[] args )
{
JButtonTest b = new JButtonTest ();
b.addWindowListener (new WindowAdapter ()
{
@Override
public void windowClosing ( WindowEvent e )
{
int exi = JOptionPane.showConfirmDialog (null, "要退出该程序吗？", "友情提示", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
if (exi == JOptionPane.YES_OPTION)
{
System.exit (0);
}
else
{
return;
}
}
});
b.setSize (300, 300);
b.setLocationRelativeTo (null);
b.setDefaultCloseOperation (JFrame.DO_NOTHING_ON_CLOSE);
b.setVisible (true);
}
}