a5_11.java

JAVA的课后作业题答案.. 原理是利用APPLET和事件响应

/*<APPLET  Code="a5_11.class"
   Width=500    Height=500>
 </APPLET>*/
import java.awt.event.*;
import java.awt.*;
import java.applet.*;
public class  a5_11 extends Applet implements MouseMotionListener,MouseListener{ 
	 int beginx=0;
	 int beginy=0;
	 int x=0;
	 int y=0;
	public void init(){
		addMouseMotionListener(this);
	    addMouseListener(this);
	}
  public void mousePressed(MouseEvent e){
       beginx=e.getX();
		beginy=e.getY();
		}
public void mouseEntered(MouseEvent e){    
}
	public void paint(Graphics g){
		g.draw3DRect(beginx,beginy,x,y,true);	
	}
	public void mouseDragged (MouseEvent e){
		x=Math.abs(beginx-e.getX());
		y=Math.abs(beginy-e.getY());
		String s ="鼠标当前位置：X="+e.getX()+";Y="+e.getY();
		showStatus(s);
		repaint();
	}
	public void mouseMoved(MouseEvent e){
}
public void mouseReleased(MouseEvent e){

}
public void mouseExited(MouseEvent e){
}
public void mouseClicked(MouseEvent e){
}
}