弹出的窗口怎么点右上角那把X关闭不了

[Yanbin_Q]

//j1.java

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class j1 extends Applet{

public void init(){
new j2();
}

}

class j2 extends Frame{
public j2(){
super("Applet 小窗口");
setSize(450,300);
show();
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}
}

页面执行的时候，弹出一个容口，但是点关闭关不了，如果把j2单独放在应用程序里可以被关闭。

[Yanbin_Q]

楼上说的极是

[shine333]

把show()放到listener后面，

因为show的执行是在整个窗体显示期间，也就是说，只有你关闭了窗口后，show才会返回，然后才能执行后面的语句

[seaman0916]

赞成shine333(shine).

一般关于JFrame你都把show写在最后!
不然,有时就会出问题的!

试试看

[Yanbin_Q]

我调过来试过了，也还是不行呀，一样出现的错误是
java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM)

at java.security.AccessControlContext.checkPermission(Unknown Source)

at java.security.AccessController.checkPermission(Unknown Source)

at java.lang.SecurityManager.checkPermission(Unknown Source)

at java.lang.SecurityManager.checkExit(Unknown Source)

at java.lang.Runtime.exit(Unknown Source)

at java.lang.System.exit(Unknown Source)

at j2$1.windowClosing(j1.java:22)

at java.awt.Window.processWindowEvent(Unknown Source)

at java.awt.Window.processEvent(Unknown Source)

at java.awt.Component.dispatchEventImpl(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Window.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)

但我曾看过别人的可以关掉

[shine333]

当然不应该用exit了，你自己的窗口关了，就要求整个系统退出，有这种道理吗，dispose()就可以了