【正确答案】程序如下：
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class Chp9_3_E extends Applet implements MouseListener,MouseMotionListener{
int x1,y1,x2,y2;
public void init(){
addMouseListener(this);
addMouseMotionListener(this);
}
public void paint(Graphics g){
g.drawRect(x1,y1,x2,y2);
int area=Math.abs(x2-x1)*Math.abs(y2-y1);
showStatus("矩形面积: "+area);
}
//implementation of MouseListener
public void mousePressed(MouseEvent e){
x1=e.getX();
y1=e.getY();
}
public void mouseClicked(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mouseReleased(MouseEvent e){}
//implementation of MouseMotionEvent
public void mouseDragged(MouseEvent e){
x2=e.getX();
y2=e.getY();
repaint();
}
public void mouseMoved(MouseEvent e){}
}
运行结果为：
【答案解析】