1: import java.awt.event.WindowAdapter;
2: import java.awt.event.WindowEvent;
3:
4: import javax.swing.JFrame;
5: import javax.swing.JOptionPane;
6: import javax.swing.WindowConstants;
7:
8: public class TestJDialog {
9:
10: public static void main(String[] args) {
11: JOptionPane.showMessageDialog(null, "程序开始启动");
12: // 要被内置类访问，所以定义成fianl
13: final JFrame f = new JFrame("TestJDialog");
14: // 当用户在点击JFrame上的关闭窗口按键时，JFrame会自动隐藏这个框架窗口，
15: // 但没有真正关闭这个窗口，还在内存中，我们要调用windowClosing，
16: // 或用下面的方法
17: f.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
18: f.addWindowListener(new WindowAdapter() {
19:
20: @Override
21: public void windowClosing(WindowEvent e) {
22: super.windowClosing(e);
23: int retval = JOptionPane.showConfirmDialog(f, "你真的要结束吗？",
24: "结束程序", JOptionPane.YES_NO_OPTION);
25: if (retval == JOptionPane.YES_OPTION) {
26: System.exit(0);
27: }
28: }
29: });
30: f.setSize(200, 200);
31: f.setVisible(true);
32: }
33:
34: }