华容道（Java Applet）

package JiaNan;
import java.awt.*; 
import java.applet.*; 
import java.awt.event.*; 
class People extends Button implements FocusListener //代表华容道人物的类 
{
	Rectangle rect=null; 
	int left_x,left_y;//按扭的左上角坐标 
	int width,height; //按扭的宽和高 
	String name; 
	int number; 
	People(int number,String s,int x,int y,int w,int h,HuaRongRoad road) 
	{
		super(s); 
		name=s;
		this.number=number; 
		left_x=x;left_y=y; 
		width=w;height=h;
		setBackground(Color.orange); 
		road.add(this);
		addKeyListener(road); 
		setBounds(x,y,w,h);
		addFocusListener(this); 
		rect=new Rectangle(x,y,w,h); 
	} 
	public void focusGained(FocusEvent e) 
	{ 
		setBackground(Color.red); 
	} 
	public void focusLost(FocusEvent e) 
	{ 
		setBackground(Color.orange); 
	} 
} 
public class HuaRongRoad extends Applet implements KeyListener,ActionListener 
{ 
	People people[]=new People[10]; 
	Rectangle left,right,above ,below;//华容道的边界 
	Button restart=new Button("重新开始"); 

	public void init() 
	{
		setSize(370,370);
		setLayout(null);
		restart.setBackground(Color.yellow); 
		add(restart); 
		restart.setBounds(5,5,80,25); 
		restart.addActionListener(this); 
		people[0]=new People(0,"曹操",104,54,100,100,this); 
		people[1]=new People(1,"关羽",104,154,100,50,this); 
		people[2]=new People(2,"张飞",54, 154,50,100,this); 
		people[3]=new People(3,"刘备",204,154,50,100,this); 
		people[4]=new People(4,"张辽",54, 54, 50,100,this); 
		people[5]=new People(5,"曹仁",204, 54, 50,100,this); 
		people[6]=new People(6,"兵 ",54,254,50,50,this); 
		people[7]=new People(7,"兵 ",204,254,50,50,this); 
		people[8]=new People(8,"兵 ",104,204,50,50,this); 
		people[9]=new People(9,"兵 ",154,204,50,50,this); 
		people[9].requestFocus(); 
		left=new Rectangle(49,49,5,260); 
		people[0].setForeground(Color.white) ; 
		right=new Rectangle(254,49,5,260); 
		above=new Rectangle(49,49,210,5); 
		below=new Rectangle(49,304,210,5); 
	} 
	public void paint(Graphics g) 
	{
		//画出华容道的边界 
		g.setColor(Color.cyan); 
		g.fillRect(49,49,5,260);//left 
		g.fillRect(254,49,5,260);//right 
		g.fillRect(49,49,210,5); //above 
		g.fillRect(49,304,210,5);//below 
		//提示曹操逃出位置和按键规则 
		g.setColor(Color.blue); 
		g.drawString("点击相应的人物,然后按键盘上的上下左右箭头移动",100,20); 
		g.setColor(Color.red); 
		g.drawString("曹操到达该位置",110,300); 
	} 
	public void keyPressed(KeyEvent e) 
	{
		People man=(People)e.getSource();//获取事件源 
		man.rect.setLocation(man.getBounds().x, man.getBounds().y); 
		if(e.getKeyCode()==KeyEvent.VK_DOWN) 
		{
	        man.left_y=man.left_y+50; //向下前进50个单位 
			man.setLocation(man.left_x,man.left_y); 
			man.rect.setLocation(man.left_x,man.left_y); 
			//判断是否和其它人物或下边界出现重叠,如果出现重叠就退回50个单位距离 
			for(int i=0;i<10;i++) 
			{
				if((man.rect.intersects(people[i].rect))&&(man.number!=i)) 
				{
					man.left_y=man.left_y-50; 
					man.setLocation(man.left_x,man.left_y); 
					man.rect.setLocation(man.left_x,man.left_y); 
				} 
			} 
			if(man.rect.intersects(below)) 
			{
				man.left_y=man.left_y-50; 
				man.setLocation(man.left_x,man.left_y); 
				man.rect.setLocation(man.left_x,man.left_y); 
			} 
		} 
		if(e.getKeyCode()==KeyEvent.VK_UP) 
		{ 
			man.left_y=man.left_y-50; //向上前进50个单位 
			man.setLocation(man.left_x,man.left_y); 
			man.rect.setLocation(man.left_x,man.left_y); 
			//判断是否和其它人物或上边界出现重叠,如果出现重叠就退回50个单位距离 
			for(int i=0;i<10;i++) 
			{
				if((man.rect.intersects(people[i].rect))&&(man.number!=i)) 
				{
				man.left_y=man.left_y+50; 
				man.setLocation(man.left_x,man.left_y); 
				man.rect.setLocation(man.left_x,man.left_y); 
				} 
			} 
			if(man.rect.intersects(above)) 
			{ 
				man.left_y=man.left_y+50; 
				man.setLocation(man.left_x,man.left_y); 
				man.rect.setLocation(man.left_x,man.left_y); 
			} 
		} 
		if(e.getKeyCode()==KeyEvent.VK_LEFT) 
		{
			man.left_x=man.left_x-50; //向左前进50个单位 
			man.setLocation(man.left_x,man.left_y); 
			man.rect.setLocation(man.left_x,man.left_y); 
			//判断是否和其它人物或左边界出现重叠,如果出现重叠就退回50个单位距离 
			for(int i=0;i<10;i++) 
			{
				if((man.rect.intersects(people[i].rect))&&(man.number!=i)) 
				{
					man.left_x=man.left_x+50; 
					man.setLocation(man.left_x,man.left_y); 
					man.rect.setLocation(man.left_x,man.left_y); 
				} 
			} 
			if(man.rect.intersects(left)) 
			{
				man.left_x=man.left_x+50; 
				man.setLocation(man.left_x,man.left_y); 
				man.rect.setLocation(man.left_x,man.left_y); 
			} 
		} 
		if(e.getKeyCode()==KeyEvent.VK_RIGHT) 
		{
			man.left_x=man.left_x+50; //向右前进50个单位 
			man.setLocation(man.left_x,man.left_y); 
			man.rect.setLocation(man.left_x,man.left_y); 
			//判断是否和其它人物或右边界出现重叠,如果出现重叠就退回50个单位距离 
			for(int i=0;i<10;i++) 
			{
				if((man.rect.intersects(people[i].rect))&&(man.number!=i)) 
				{
					man.left_x=man.left_x-50; 
					man.setLocation(man.left_x,man.left_y); 
					man.rect.setLocation(man.left_x,man.left_y); 
				} 
			} 
			if(man.rect.intersects(right)) 
			{ 
				man.left_x=man.left_x-50; 
				man.setLocation(man.left_x,man.left_y); 
				man.rect.setLocation(man.left_x,man.left_y); 
			} 
		} 
	} 
	public void keyTyped(KeyEvent e){} 
	public void keyReleased(KeyEvent e){} 
	public void actionPerformed(ActionEvent e) 
	{ 
		this.removeAll(); 
		this.init(); 
	} 
}