一个简单的窗体打开、关闭和激活事件

Question

import javax.swing.*;
import java.awt.event.*;
public class Swing15 extends JFrame implements WindowListener
{
   public Swing15()
   {
   this.setTitle("窗体打开、关闭和激活事件");
   this.addWindowListener(this);
   this.setBounds(300,250,300,200);
   this.setVisible(true);
   }
   public void windowOpened(WindowEvent e)
   {
   System.out.println("窗体首次变为可见");
   }
   public void windowClosing(WindowEvent e)
   {
   System.out.println("关闭窗体");
   }
   public void windowClosed(WindowEvent e)
   {
   System.out.println("关闭窗口后");
   }
   public void windowIconfied(WindowEvent e)
   {
   System.out.println("从正常状态变为最小化状态");
   }
   public void windowDeiconfied(WindowEvent e)
   {
   System.out.println("从最小化状态变为正常状态");
   }
   public void windowActivated(WindowEvent e)
   {
   System.out.println("窗体被激活");
   }
   public void windowDeactivated(WindowEvent e)
   {
   System.out.println("窗体变为非激活");
   }
   public static void main(String[] args)
   {
   Swing15 s=new Swing15();
   }
}
这道程序的运行咋的就不能如我所愿了咯，有好多奇怪的信息，看不懂，呵呵，麻烦讲解下哦。

Answer 1

你这段代码运行后事件并不会执行。就会显示一个窗口。如果你要执行事件的话，还要添加监听把这些事件的代码监听addWindowListener(new WindowListener(){//实现监听接口 });
具体的做法你可以参考下其它的书或到网上多找找相关的资料

Answer 2

Swing15.java:3: Swing15 不是抽象的，并且未覆盖 java.awt.event.WindowListener 中的抽象方法 windowDeiconified(java.awt.event.WindowEvent)
还有你有个方法没有实现，你编译能过吗？？？？

Answer 3

还有2个方法需要覆盖.import javax.swing.*;
import java.awt.event.*;public class Swing15 extends JFrame implements WindowListener {
public Swing15() {
this.setTitle("窗体打开、关闭和激活事件");
this.addWindowListener(this);
this.setBounds(300, 250, 300, 200);
this.setVisible(true);
} public void windowOpened(WindowEvent e) {
System.out.println("窗体首次变为可见");
} public void windowClosing(WindowEvent e) {
System.out.println("关闭窗体");
} public void windowClosed(WindowEvent e) {
System.out.println("关闭窗口后");
} public void windowIconfied(WindowEvent e) {
System.out.println("从正常状态变为最小化状态");
} public void windowDeiconfied(WindowEvent e) {
System.out.println("从最小化状态变为正常状态");
} public void windowActivated(WindowEvent e) {
System.out.println("窗体被激活");
} public void windowDeactivated(WindowEvent e) {
System.out.println("窗体变为非激活");
} public static void main(String[] args) {
Swing15 s = new Swing15();
} public void windowDeiconified(WindowEvent e) { //加上这个 } public void windowIconified(WindowEvent e) { //加上这个 }
}

Answer 4

import javax.swing.*;
import java.awt.event.*;public class Swing15 extends JFrame implements WindowListener {
public Swing15() {
this.setTitle("Window Open-Close-Activate event");
this.addWindowListener(this);
this.setBounds(300, 250, 300, 200);
this.setVisible(true);
} public void windowOpened(WindowEvent e) {
System.out.println("window opened first time");
} public void windowClosing(WindowEvent e) {
System.out.println("window closing");
} public void windowClosed(WindowEvent e) {
System.out.println("window closed");
} public void windowIconfied(WindowEvent e) {            //Iconfied--->Iconified      拼写错误？
System.out.println("window iconfied");
} public void windowDeiconfied(WindowEvent e) {          //Deiconfied--->Deiconified  拼写错误？
System.out.println("window deiconfied");
} public void windowActivated(WindowEvent e) {
System.out.println("window activated");
} public void windowDeactivated(WindowEvent e) {
System.out.println("window deactivated");
} public static void main(String[] args) {
Swing15 s = new Swing15();
} @Override
public void windowDeiconified(WindowEvent e) {
// TODO Auto-generated method stub
System.out.println("window deiconified");
} @Override
public void windowIconified(WindowEvent e) {
// TODO Auto-generated method stub
System.out.println("window iconified");
}
}