小编Mik*_*olo的帖子

我试图移动一个矩形,但我不知道该怎么做,我知道它与'mouseClicked(MouseEvent e)`有关,但不知道如何使用它.这是我到目前为止的代码:

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class MovRect extends Applet implements MouseMotionListener, MouseListener {
Color color = Color.green;
int x=30,y=30,w=150,l=150;
String MouseMotion ="";

public void init()
{
    addMouseListener(this);
    addMouseMotionListener(this);
}
public void paint(Graphics g)
{
    super.paint(g);

    g.setColor(color);
    g.drawRect(x, y, w, l);

}
public void mouseClicked(MouseEvent e)
{
    String clickDesc;
    if (e.getClickCount() == 2)
        clickDesc = "double";
    else
        clickDesc = "single";

    System.out.println("Mouse was " + clickDesc + "-clicked at location (" +
        e.getX() + ", " + e.getY() …

该程序假设调用以下URL http://www.google.com当选择退出时,所有其他按钮工作正常但当我点击"退出"时没有任何反应.
我也得到:

warning: unreachable catch clause
    catch( IOException iox ) {
    ^
thrown type MalformedURLException has already been caught

请帮忙

import java.awt.*;
import java.lang.*;
import java.applet.*;
import java.util.Vector;
import java.io.IOException;
import java.net.*;
import java.net.MalformedURLException;
import java.applet.Applet.*;

public class Stage extends Canvas implements Runnable
{
public class Stage2 extends Applet
{

        public Stage2() {};


    }
Stage2 stage2= new Stage2();


Graphics offGraphics = null;
Image    offImage;



Thread   conductor;

Ball     balls[];
int      numBalls;
int      numBallsAllocated;

int      width;
int      height;

int      sleepy …