J2se Swing JOptionPane应用:对话框,启动,关闭提示


 

 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:  }

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