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// 发牌程序。

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class CardBuffer //加互斥锁的缓冲区

{

private int value;

private boolean isEmpty = true; //value是否为空的信号量

private int order=0; //信号量，e68a8462616964757a686964616f31333236373165约定取牌线程的次序

synchronized void put(int i)

{

while (!isEmpty) //当value不空时，等待

{

try

{

this.wait(); //等待

}

catch(InterruptedException e) {}

}

value = i; //当value空时，value获得值

isEmpty = false; //设置value为不空状态

notifyAll(); //唤醒所有其他等待线程

}

synchronized int get(int order) //order是取牌线程约定的次序

{

while (isEmpty || (this.order!=order)) //当value空或取牌次序不符时等待

{

try

{

this.wait();

}

catch(InterruptedException e) {}

}

isEmpty = true; //设置value为空状态，并返回值

notifyAll();

this.order = (this.order+1)%4; //加1使取牌次序轮转

return value;

}

}

class Sender extends Thread //发牌线程类

{

private CardBuffer cardbuffer;

private int count;

public Sender(CardBuffer cardbuffer,int count)

{

this.cardbuffer = cardbuffer;

this.count = count;

}

public void run()

{

for (int i=1;i<=this.count;i++)

cardbuffer.put(i);

}

}

class Receiver extends Thread //取牌线程类

{

private CardBuffer cardbuffer;

private JTextArea text;

private int order; //信号量，约定取牌线程的次序

public Receiver(CardBuffer cardbuffer,JTextArea text,int order)

{

this.cardbuffer = cardbuffer ;

this.text = text ;

this.order = order;

}

public void run()

{

while(true)

{

text.append(" "+cardbuffer.get(this.order));

try

{

this.sleep(100);

}

catch(InterruptedException e) {}

}

}

}

class CardJFrame extends JFrame

{

public CardJFrame()

{

super("发牌程序");

this.setSize(430,200);

this.setLocation(300,240);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.setLayout(new GridLayout(3,3,5,5)); //3行3列网格布局，间隔为5

JTextArea text_north,text_east,text_south,text_west; //获得牌的4个文本区

text_north = new JTextArea();

text_east = new JTextArea();

text_south = new JTextArea();

text_west = new JTextArea();

text_north.setLineWrap(true); //设置文本区自动换行

text_east.setLineWrap(true);

text_south.setLineWrap(true);

text_west.setLineWrap(true);

text_north.setEditable(false);

text_east.setEditable(false);

text_south.setEditable(false);

text_west.setEditable(false);

Font font = new Font("Helvetica", Font.PLAIN, 16);

text_north.setFont(font);

text_east.setFont(font);

text_south.setFont(font);

text_west.setFont(font);

this.add(new JPanel()); //网格布局的第1行

this.add(text_north);

this.add(new JPanel());

this.add(text_west); //网格布局的第2行

this.add(new JPanel());

this.add(text_east);

this.add(new JPanel()); //网格布局的第3行

this.add(text_south);

this.add(new JPanel());

this.setVisible(true);

CardBuffer cardbuffer = new CardBuffer();

Sender s = new Sender(cardbuffer,52);

s.setPriority(10); //设置最高优先级

s.start(); //启动发牌线程

(new Receiver(cardbuffer,text_north,0)).start(); //创建并启动4个取牌线程，优先级为5

(new Receiver(cardbuffer,text_east,1)).start();

(new Receiver(cardbuffer,text_south,2)).start();

(new Receiver(cardbuffer,text_west,3)).start();

}

public static void main(String arg[])

{

new CardJFrame();

}

}

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