Question

小弟写JAVA的一个小程序遇到了问题，求解。构造一个窗口，然后关闭这个窗口时，弹出一个提示的窗口。

import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;
public class Frame
{
public static void main(String[] args)
{
myFrame frame = new myFrame();
frame.setVisible(true);
frame.addWindowListener(new
WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.out.println("OK");
//这里想弹一个窗口出来
messageFrame message = new messageFrame();
message.setVisible(true);
}
});
}
}
class myFrame extends JFrame
{
public myFrame()
{
setSize(400, 200);
setLocationByPlatform(true);
setTitle("want to close?");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}
private JPanel buttonPanel;
}
class messageFrame extends JFrame
{
public messageFrame()
{
setSize(500, 500);
setLocationByPlatform(true);
setTitle("OK");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

myText text = new myText();
add(text);
}
class myText extends JComponent
{
public void paintComponent(Graphics g)
{
g.drawString("windowClosed", 100, 100);
}
}
}
我编译运行之后，第一个窗口显示了出来，但我一点关闭，第二个窗口好像闪了一下，就没了，怎么搞得？求解！

Answer 1

这是你的源代码：
import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;
public class Frame
{
public static void main(String[] args)
{
myFrame frame = new myFrame();
frame.setVisible(true);
frame.addWindowListener(new
WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.out.println("OK");
//这里想弹一个窗口出来
messageFrame message = new messageFrame();
message.setVisible(true);
}
});
}
}
class myFrame extends JFrame
{
public myFrame()
{
setSize(400, 200);
setLocationByPlatform(true);
setTitle("want to close?");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //注意你的这句错了，设置了默认的点击关闭按钮的时候执行关闭，应该去掉，你的代码比较多，我修改过了。

}
private JPanel buttonPanel;
}
class messageFrame extends JFrame
{
public messageFrame()
{
setSize(500, 500);
setLocationByPlatform(true);
setTitle("OK");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

myText text = new myText();
add(text);
}
class myText extends JComponent
{
public void paintComponent(Graphics g)
{
g.drawString("windowClosed", 100, 100);
}
}
}

这是我修改后的代码：
import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;
class myFrame extends JFrame
{
public myFrame()
{
setSize(400, 200);
setLocationByPlatform(true);
setTitle("want to close?");
}
messageFrame message = new messageFrame(); //这里想弹一个窗口出来

public static void main(String[] args)
{
myFrame frame = new myFrame();

frame.setVisible(true);
frame.addWindowListener(new
WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
new messageFrame().showFrame();

}
});
}

}
class messageFrame extends JFrame
{
public void showFrame()
{
setSize(500, 500);
setLocationByPlatform(true);
setTitle("OK");
myText text = new myText();
add(text);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
class myText extends JComponent
{
public void paintComponent(Graphics g)
{
g.drawString("windowClosed", 100, 100);
}
}
}