java 控制台报错：求对报错的解释。 我屏蔽了一条语句：然后就报错了：类不是抽象的且没有覆盖 抽象方法。

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class MouseMove extends Applet implements MouseListener,MouseMotionListener
{
	int x,y;
	String s = "";
	public void init(){
	this.addMouseListener(this);
	this.addMouseMotionListener(this);
	}
	public void paint(Graphics g){
	g.drawString(s,50,100);
	float a,b,c;
	a = (float)Math.random();
	b = (float)Math.random();
	c = (float)Math.random();
	g.setColor(new Color(a,b,c));
	g.drawString("鼠标当前的位置:("+x+","+y+")",x,y);
	}
	public void mouseClicked(MouseEvent e){
	x = e.getX();
	y = e.getY();
	if(e.getClickCount()==1)
		s="once";
	else if(e.getClickCount()==2)
	     s="twice";
	repaint();
	}
	public void mouseEntered(MouseEvent e){
	x = e.getX();
	y = e.getY();
	s = "鼠标进入Applet";
	repaint();
	}
	public void mouseExited(MouseEvent e){
	x = e.getX();
	y = e.getY();
	s = "鼠标离开了Applet";
	repaint();
	}
	public void mousePressed(MouseEvent e){
	x = e.getX();
	y = e.getY();
	s = "您按下鼠标";
	repaint();
	}
	public void mouseReleased(MouseEvent e){
	x = e.getX();
	y = e.getY();
	s = "您松开了鼠标";
	repaint();
	}
	public void mouseDragged(MouseEvent e){
	x = e.getX();
	y = e.getY();
	s = "您拖动了鼠标";
	repaint();
	}
	/*public void mouseMoved(MouseEvent e){
	x = e.getX();
	y = e.getY();
	s = "您移动了鼠标";
	repaint();
	}*/
}

追问：恩 抽象类的子类必须实现接口的所有方法吗o我明白 您的意思啦

答案：你的类必须实现MouseListener和MouseMotionListener这两个接口中的所有方法。
所以mouseMoved(MouseEvent e)方法不能被注释掉。
你可以象下面这样注释就没问题了。
public void mouseMoved(MouseEvent e) {
 /*
	x = e.getX();
	y = e.getY();
	s = "您移动了鼠标";
	repaint();
*/
}

其他：你应该把你的错误贴出来，要不然我怎么解释？ 

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