dining.java

java课程的资料以及实验的代码

class Chopstick
{ 
	boolean available;
	Chopstick()
	{ 
		available=true;
	}
	public synchronized void takeup()
	{ 
		while(!available)
		{ 
			try
			{ 
				System.out.println("哲学家在等待另一根筷子");
				wait();
			}
			catch(InterruptedException e){}
		}
		available=false;
	}
	
	public synchronized void putdown()
	{ 
		available=true;
		notify();
	}
}

class Philosopher extends Thread
{ 
	Chopstick left,right;
	int p_num;
	
	Philosopher(int num,Chopstick c1,Chopstick c2)
	{ 
		p_num=num;
		left=c1;
		right=c2;
	}
	public void eat()
	{ 
		left.takeup();
		right.takeup();
		System.out.println("哲学家"+(p_num+1)+" 正在进餐");
	}
	public void think()
	{ 
		left.putdown();
		right.putdown();
		System.out.println("哲学家"+(p_num+1)+" 正在思考");
	}
	public void run()
	{ 
		while(true)
		{ 
			eat();
			try{sleep(1000);}
			catch(InterruptedException e){}
			think();
			try{sleep(1000);}
			catch(InterruptedException e){}
		}
	}
}

public class Dining
{ 
	static Chopstick[] cs=new Chopstick[5];
	static Philosopher[] ps=new Philosopher[5];
	
	public static void main(String[] args)
	{ 
		for(int i=0;i<5;i++)
		{cs[i]=new Chopstick();}
		for(int i=0;i<5;i++)
		{ps[i]=new Philosopher(i,cs[i],cs[(i+1)%5]);}
		for(int i=0;i<5;i++)
		{ps[i].start();}
	}
}