大虾帮我看一下代码好吗？

Question

app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
{
                           JOptionPane.showMessageDialog(this, "message");//加在这
System.exit( 0 );
}
}
);

Answer 1

我说的是子窗口，JInternalFrame关闭的时候弹出。

Answer 2

//你运行下面的程序就可以实现了
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.sql.*;
import javax .swing.event.*; 
public class Hand extends JFrame
{

JDesktopPane theDesktop; public Hand()
{
    
theDesktop = new JDesktopPane();
getContentPane().add( theDesktop ); JMenuBar bar = new JMenuBar();
setJMenuBar( bar );

JMenu toolMenu = new JMenu( "¹¤¾ß" );
JMenuItem selectMenuItem = new JMenuItem( "²éѯ" );
selectMenuItem.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent e )
{
             JInternalFrame selectFrame = new JInternalFrame( "Êý¾Ý¿â²éѯ",
                                        true, true, true, true );
         selectFrame.setSize( 500, 400 );
         theDesktop.add( selectFrame );
                 selectFrame.setOpaque( true );  selectFrame.addInternalFrameListener(
 new InternalFrameAdapter()
{
public void internalFrameClosing(InternalFrameEvent e)
{
JOptionPane.showMessageDialog(null,"the JInternalFrame closing");
}
}
);
         selectFrame.show(); }
}
);
toolMenu.add( selectMenuItem );
bar.add( toolMenu );
setSize ( 800, 600 );
show();


}
public static void main( String args[] )
 {
final Hand app = new Hand();

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

Answer 3

错误提示：
D:\java>javac Hand.java
Hand.java:35: cannot resolve symbol
symbol: class InternalFrameListener
                       new InternalFrameListener() {
                           ^
1 error

Answer 4

你需要导入：
import javax.swing.event.InternalFrameAdapter;
import javax.swing.event.InternalFrameEvent;
载试试

Answer 5

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.sql.*;
import javax.swing.event.InternalFrameAdapter;
import javax.swing.event.InternalFrameEvent;
public class Hand extends JFrame
{        JDesktopPane theDesktop;
        JInternalFrame selectFrame;
        public Hand()
        {                theDesktop = new JDesktopPane();
                getContentPane().add( theDesktop );                JMenuBar bar = new JMenuBar();
                setJMenuBar( bar );                JMenu toolMenu = new JMenu( "工具" );
                JMenuItem selectMenuItem = new JMenuItem( "查询" );
                selectMenuItem.addActionListener(
                        new ActionListener() {
                        public void actionPerformed( ActionEvent e )
                        {
                     selectFrame = new JInternalFrame( "数据库查询",
                                                                true, true, true, true );
                         selectFrame.setSize( 500, 400 );
                         theDesktop.add( selectFrame );
                 selectFrame.setOpaque( true );
                         selectFrame.show();
                         selectFrame.addInternalFrameListener(new InternalFrameAdapter() {
                             public void internalFrameClosing(InternalFrameEvent e) {
                                 JOptionPane.showMessageDialog(null, "message");
                             }
                         });
                        }
                }
                );
                toolMenu.add( selectMenuItem );
                bar.add( toolMenu );
                setSize ( 800, 600 );
                show();
        }
public static void main( String args[] )
 {
        final Hand app = new Hand();        app.addWindowListener(
                new WindowAdapter() {
                public void windowClosing( WindowEvent e )
                {
                        System.exit( 0 );
                }
        }
        );
  }
 }我已经帮你测试过了，没有问题！