实验题目：用Java的等待/通知机制实现“厨师—食 者”问题。假设分别有4位厨师和6位食者。厨师做一盘 菜的时间为4s，食者吃一盘菜的时间为3s。编程实现这 一功能，参考“生产者—消费者”问题。

Food类

package cook_eat;

public class Food {

}

　　

Cook类

package cook_eat;

public class Cook extends Thread{

	private Table table;
	
	public Cook(Table table) {
		this.table = table;
	}

	@Override
	public void run() {
		while(true) {
			// 做菜
			Food food = new Food();
			// 需要四秒
			try {
				Thread.sleep(4000);
			} catch (Exception e) {
				e.printStackTrace();
			}
			// 上菜
			table.putFood(food);
		}
	}
	
}

　　

Eater类

package cook_eat;

public class Eater extends Thread{

	private Table table;
	
	public Eater(Table table) {
		this.table = table;
	}
	
	@Override
	public void run() {
		while(true) {
			// 吃菜
			Food food = table.getFood();
			// 需要三秒
			try {
				Thread.sleep(3000);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

}

　　

Table类

package cook_eat;

import java.util.LinkedList;

class Table extends LinkedList<Object> {
	int maxSize; // 容器的最大容量
 
	public Table(int maxSize) {
		this.maxSize = maxSize;
	}
	public synchronized void putFood(Food f) { // 向容器内放置食品
		
		while (this.size() >= this.maxSize) {
			try {
				System.out.println("The table is too full,wait a moment!");
				wait();
			} catch (Exception e) {
			}
		}
		this.addLast(f);
		System.out.println("厨师上一份菜，现在桌上还有有"+this.size()+"份菜");
		notifyAll();
	}
 
	public synchronized Food getFood() { // 从容器内取食品
		Food f;
		while (this.size() <= 0) {
			try {
				System.out.println("There is no food now ,come here later!");
				wait();
			} catch (Exception e) {
			}
		}
		f = (Food) this.getFirst();
		this.remove(f);
		System.out.println("食客吃了一份菜，现在桌上有"+this.size()+"份菜");
		notifyAll();
		return f;
	}
}

　　

Test类

package cook_eat;

public class Test {

	public static void main(String[] args) {
		// 假定一开始桌上有六道菜
		Table table = new Table(6);
		// 厨师开始做菜
		new Cook(table).start();
		new Cook(table).start();
		new Cook(table).start();
		new Cook(table).start();
		// 食客开始吃菜
		new Eater(table).start();
		new Eater(table).start();
		new Eater(table).start();
		new Eater(table).start();
		new Eater(table).start();
		new Eater(table).start();
	}

}