求解JApplet 中的update()方法为何没有调用？

[hitzsf]

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;


public class TMouse extends JApplet implements MouseListener{
Container con;
int width,height;
int x,y;
int flag;

public void init(){
con=this.getContentPane();

x=y=0;
width=height=2;

flag=0;

con.addMouseListener(this);
}

public void update(Graphics g){
g.setColor(this.getBackground());
g.fillRect(0,0,
getWidth(),
getHeight());
paint(g);
}

public void paint(Graphics g){

g.setColor(Color.blue);
g.drawString("Click the MouseButton ....",5,20);
g.setColor(Color.red);

if(flag==1)
g.drawString("Mouse Entered Applet",5,80);

}

public void mouseEntered(MouseEvent me){
flag=1;
repaint();
}

public void mouseExited(MouseEvent me){
flag=2;
repaint();
}

public void mouseClicked(MouseEvent me){
flag=3;
x=me.getX();
y=me.getY();
repaint();
}

public void mousePressed(MouseEvent me){
flag=4;
x=me.getX();
y=me.getY();
repaint();
}

public void mouseReleased(MouseEvent me){
flag=5;
x=me.getX();
y=me.getY();
repaint();
}
}


/*
<Applet Code=TMouse width=400 height=200>
</Applet>
*/

内容没有被覆盖啊，后来在update()中 加入了打印语句，也未见执行，

repaint() ->update()->paint() 应该是这个顺序的，可是为何不见update()方法的执行呢？

[hitzsf]

搞定了，呵呵

[hitzsf]

虽然解决了刷新面板的问题，但还不能明白为啥 update()方法为何没有调用
有说是java线程的问题，不知道对不对？

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;


public class  TMouse extends JApplet implements MouseListener{
	Container con;
	int width,height;
	int x,y;
	int flag;

    @Override
	public void init(){    
    	con=this.getContentPane();

		x=0;
        y=0;
		width=20;
        height=20;

		flag=0;
        

		con.addMouseListener(this);
	}

    @Override
	public void update(Graphics g){
        System.out.println("s");
		g.setColor(Color.yellow);
		g.fillRect(0,0,this.getWidth(),this.getHeight());
        paint(g);            
		
	}

    @Override
	public void paint(Graphics g){
		super.paint(g);
		g.setColor(Color.blue);
		g.drawString("Click the MouseButton ....",5,20);
		g.setColor(Color.red);

		if(flag==1)
			g.drawString("Mouse Entered Applet",5,80);

		else if(flag==2)
			g.drawString("Mouse Exited Applet",5,80);

		else if(flag==3){
                       	g.drawString("Mouse Entered Applet",5,80);
			g.fillRect(x,y,width,height);
			g.drawString("Click Here!",x,y);
		}

		else if(flag==4){
			g.drawString("Mouse Entered Applet",5,80);
			g.fillRect(x,y,width,height);
			g.drawString("Pressed Here!",x,y);
		}

		else if(flag==5){
			g.drawString("Mouse Entered Applet",5,80);
			g.fillRect(x,y,width,height);
			g.drawString("Mouse Released!",x,y);
		}
	}

    @Override
		public void mouseEntered(MouseEvent me){
			flag=1;
			repaint(0,0,0,getWidth(),getHeight());
		}

    @Override
		public void mouseExited(MouseEvent me){
			flag=2;
			repaint(0,0,0,getWidth(),getHeight());
		}

    @Override
		public void mouseClicked(MouseEvent me){
			flag=3;
			x=me.getX();
			y=me.getY();
			repaint();
		}

    @Override
		public void mousePressed(MouseEvent me){
			flag=4;
			x=me.getX();
			y=me.getY();
			repaint();
		}

    @Override
		public void mouseReleased(MouseEvent me){
			flag=5;
			x=me.getX();
			y=me.getY();
			repaint();
		}
}


/*
<Applet Code=TMouse  width=400  height=200>
</Applet>
*/