package com.a.b;

import java.awt.Color;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

public class Window {

	public static void main(String[] args) {

		//

		final JFrame f = new JFrame("窗口的");

		f.addWindowListener(new WindowAdapter() {

			// 这里没有那个方法

			public void actionPerformed(WindowEvent e) {// 这里的参数f还非的是final型的

				int userSelect = JOptionPane.showConfirmDialog(f, "确定要退出吗？",

						"你好", JOptionPane.YES_NO_OPTION);

				if (userSelect == JOptionPane.YES_NO_OPTION) {

					System.exit(0);

				}

			}

		});

		f.setBackground(Color.green);

		f.setVisible(true);

		f.setSize(500, 500);

		f.setDefaultCloseOperation(3);

	}

}