菜鸟的问题

[china2685920]

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

public class CloseTest implements WindowListener{
public Frame f;

public void go(){
f=new Frame("test");
f.setLayout(new FlowLayout());
Button bn=new Button("yy");
f.add(bn);
f.addWindowListener(this);
f.setSize(300,200);
f.setVisible(true);
}

public static void main(String args[]){
CloseTest yy=new CloseTest();
yy.go();
}
public void windowClosed(WindowEvent e) {}
}


CloseTest is not abstract and does not override abstract method windowOpened(java.awt.event.WindowEvent) in java.awt.event.WindowListener
public class CloseTest implements WindowListener{
^
1 error

Process completed.
为什么会这样？

[ladofwind]

必须实现:windowOpened(WindowEvent e) 方法

[huataixiang19810225]

由于WindowListener是一个抽象类,所以你需要实现windowOpened(WindowEvent e)方法,可以在你的类里面任意加一个该方法的实现:
public void windowOpened(WindowEvent e){
//可以啥也不干
}

[lpeter]

实现了这个方法也没有用,这个类有七个方法,你得全部实现!!!

[heronce]

实现这七方法就行了：
public void windowActivated(WindowEvent e){}
public void windowClosed(WindowEvent e){}
public void windowClosing(WindowEvent e){}
public void windowDeactivated(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowOpened(WindowEvent e){}
要不然就继承WindowAdapter适配器，这样简单

[aywrenyue]

用Adapter把

[stevensinclair]

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

public class CloseTest {
public Frame f;

public void go(){
f=new Frame("test");
f.setLayout(new FlowLayout());
Button bn=new Button("yy");
f.add(bn);
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);//正常退出
}
}
);
f.setSize(300,200);
f.setVisible(true);
}
public static void main(String args[]){
CloseTest yy=new CloseTest();
yy.go();
}
}///：~

你想这样吧，ok，我给你修改好了。记得要给分哦。
呵呵。

[china2685920]

学了不少，谢谢大家热心帮忙~~