问题描述

我是菜鸟，搞不定了，麻烦了

代码如下：

import java.awt.*;
import java.awt.event.*;
public class Jian extends Frame implements WindowListener
{//上面的错误是什么？但是程序还可以运行
    Jian()
    {
        this.setTitle("窗口监听");
        this.addWindowListener(this);
        this.setBounds(100,100,300,300);
        this.setVisible(true);

    }
    public void windowActivated(WindowEvent e)
    {
        System.out.println("激活");
    }
    public void windowClose(WindowEvent e)
    {
        System.out.println("释放");
    }http://ask.csdn.net/questions/214642#
    public void windowClosing(WindowEvent e)
    {
        System.out.println("菜单关闭");
        this.dispose();
    }
    public void windowDeactivated(WindowEvent e)
    {
        System.out.println("失去焦点");
    }
    public void windowDeiconified(WindowEvent e)
    {
        System.out.println("到最大化");
    }
    public void windowIcoified(WindowEvent e)
    {
        System.out.println("到最小化");
    }
    public void windowOpend(WindowEvent e)
    {
        System.out.println("打开");
    }

    public static void main(String args[])
    {
        new Jian();
    }

}

解决方案

鼠标放上去看一下提示，有可能是重名

解决方案二：

为什么不把所有的错误信息都黏贴出来，光看代码是很难判断出错的地方是那里的，

解决方案三：

解决方案四：

这就是全部的信息了：

激活
Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problem:
The type Jian must implement the inherited abstract method WindowListener.windowOpened(WindowEvent)

at Jian.windowOpened(Jian.java:3)
at java.awt.Window.processWindowEvent(Window.java:1859)
at java.awt.Window.processEvent(Window.java:1820)
at java.awt.Component.dispatchEventImpl(Component.java:4583)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4413)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

失去焦点
激活
菜单关闭
Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problem:
The type Jian must implement the inherited abstract method WindowListener.windowClosed(WindowEvent)

at Jian.windowClosed(Jian.java:3)
at java.awt.Window.processWindowEvent(Window.java:1865)
at java.awt.Window.processEvent(Window.java:1820)
at java.awt.Component.dispatchEventImpl(Component.java:4583)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4413)失去焦点

at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

解决方案五：

The type Jian must implement the inherited abstract method WindowListener.windowClosed(WindowEvent)
好明显的错误提示，这是要你实现它的抽象方法，你的代码肯定是没有实现抽象方法windowClosed(WindowEvent)，
你的代码是
public void windowClose(WindowEvent e)
{
System.out.println("释放");
}
名字少了一个d，是两个不同的方法

解决方案六：

激活
Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problem:
The type Jian must implement the inherited abstract method WindowListener.windowOpened(WindowEvent)

at Jian.windowOpened(Jian.java:3)
at java.awt.Window.processWindowEvent(Window.java:1859)
at java.awt.Window.processEvent(Window.java:1820)
at java.awt.Component.dispatchEventImpl(Component.java:4583)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4413)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

菜单关闭
失去焦点
释放

解决方案七：

The type Jian must implement the inherited abstract method WindowListener.windowOpened(WindowEvent)
自己也要学会看错误提示，要仔细看，
public void windowOpend(WindowEvent e)
{
System.out.println("打开");
}
要实现的方法是windowOpened(WindowEvent)，和你的不同，你的少了一个 e 。

个人认为你应该系统的学习知识，你这种情况可以看出你基础不扎实，如果你想继续往这方面发展，应该练好基础。另外要锻炼心性，你还不够细心

解决方案八：

WindowListener接口中抽象方法要全部实现的，像Eclipse中会根据提示自动导入的，建议在IDE中编写。