Question

Java 窗体事件

以下是我自己写的一段窗体事件的代码，我自己仔细看了几遍，觉得没有写错，但是Eclipse报错，我是新人，刚学Java没多久，请高手指点一下~

import java.awt.event.WindowFocusListener;

import javax.swing.*;

public class WindowEvent extends JFrame{
public static void main(){
WindowEvent frame = new WindowEvent();
frame.setVisible(true);
}
public WindowEvent(){
super();
addWindowFocusListener( new MYWindowFocusListener());
setTitle("WindowEvent");
setBounds(100,100,500,375);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private class MYWindowFocusListener() implements WindowFocusListener{
public void windowGainedFocus(WindowEvent e){

}
public void windowLostFocus(WindowEvent e){

}
}

}

如果能帮我讲解一下，会再追加分数的

Answer 1

import java.awt.event.*;

import javax.swing.*;

public class WindowEvent extends JFrame{
public static void main(){
WindowEvent frame = new WindowEvent();
frame.setVisible(true);
}
public WindowEvent(){
super();
addWindowFocusListener( new MYWindowFocusListener());
setTitle("WindowEvent");
setBounds(100,100,500,375);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private class MYWindowFocusListener implements WindowFocusListener{

public void windowGainedFocus(java.awt.event.WindowEvent e) {

}
public void windowLostFocus(java.awt.event.WindowEvent e) {

}
}

}

private class MYWindowFocusListener() implements WindowFocusListener{

MYWindowFocusListener是个内部类 后面不能加（）它是类不是方法，应该是
private class MYWindowFocusListener implements WindowFocusListener{

Answer 2

class MYWindowFocusListener 后不应加括号

Answer 3

addWindowFocusListener( new MYWindowFocusListener()
{
//这里不感觉少点东西吗?
//写上你的处理事件函数.
}
);

Answer 4

您的main()函数没有跟参数，改成这样试:
public static void main(String[] args) {
//您的代码
}