上机题目（初级）- 鼠标控制小球（Java）

本节实现小球跟随鼠标移动的功能，这里要实现鼠标移动监听，代码如下：

import java.awt.Color;import java.awt.Frame;import java.awt.Graphics;import java.awt.Panel;import java.awt.event.MouseEvent;import java.awt.event.MouseMotionListener;public class KeyListenerDemo {public static void main(String[] args) {Frame frame = new Frame();frame.setSize(800, 800);frame.setBackground(Color.BLACK);MyPanel myPanel = new MyPanel();frame.add(myPanel);frame.addMouseMotionListener(myPanel);myPanel.addMouseMotionListener(myPanel);frame.show();}}class MyPanel extends Panel implements MouseMotionListener {int x = 150;int y = 150;@Overridepublic void paint(Graphics g) {g.setColor(Color.WHITE);g.fillOval(x, y, 20, 20);}@Overridepublic void mouseDragged(MouseEvent e) {}@Overridepublic void mouseMoved(MouseEvent e) {x=e.getX();y=e.getY();repaint();}}

代码运行实例如下：