java多線程-生產者消費者

    例子用java多線程模擬生產者消費者的例子，上代碼，代碼有註釋說的清楚：

倉庫

package day5;
/**
 * <p>Title: Warehouse.java</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2014</p>
 * @author 雪含心
 * @date 2014年2月7日
 */
public class Warehouse {
	private int MAXNUM = 100;
	private int currentCount;
	
	public Warehouse(int i) {
		this.currentCount = i;
	}

	/**
	 * 生產者
	 * @param neednum
	 */
	public synchronized void produce(int neednum){
		
		// 噹噹前的數量和生產的數量大於倉庫容量時等待消費
		while (currentCount + neednum > MAXNUM) {
			try {
				System.out.println("要生產的產品" + neednum + "個產品，超過倉庫最大值" + MAXNUM);

				wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		currentCount += neednum;
		System.out.println("已經生產了" + neednum + "個產品，現倉儲量爲" + currentCount);

		notifyAll();
	}
	
	/**
	 * 消費者方法
	 * @param neednum
	 */
	public synchronized void consume(int neednum){
		
		// 噹噹前的消費的數量大於庫存時等待生產
		while (currentCount < neednum) {
			try {
				wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		currentCount -= neednum;
		System.out.println("已經消費了" + neednum + "個產品，現倉儲量爲" + currentCount);
		notifyAll();
	}
	
}

 生產者

package day5;
/**
 * <p>Title: Productor.java</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2014</p>
 * @author 雪含心
 * @date 2014年2月7日
 */
public class Producer extends Thread {

	private Warehouse house;
	private int neednum;
	
	public Producer(Warehouse house, int neednum){
		this.neednum = neednum;
		this.house = house;
	}
	@Override
	public void run() {
		house.produce(neednum);
	}


}

 消費者

package day5;
/**
 * <p>Title: Consumer.java</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2014</p>
 * @author 雪含心
 * @date 2014年2月7日
 */
public class Consumer extends Thread {
	
	private Warehouse house;
	private int neednum;
	
	public Consumer(Warehouse house, int neednum){
		this.neednum = neednum;
		this.house = house;
	}
	@Override
	public void run() {
		house.consume(neednum);
	}

}

 測試用例

package day5;
/**
 * <p>Title: Test.java</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2014</p>
 * @author 雪含心
 * @date 2014年2月7日
 */
public class Test {
	
	public static void main(String[] args) {
		
		Warehouse hourse = new Warehouse(30); 
		while(true){
			Consumer c1 = new Consumer(hourse,50); 
		    Consumer c2 = new Consumer(hourse, 20); 
		    Consumer c3 = new Consumer(hourse, 30); 
		    Consumer c4 = new Consumer(hourse,50); 
		    Consumer c5 = new Consumer(hourse, 20); 
		    Consumer c6 = new Consumer(hourse, 30); 
  		    
		    Producer p1 = new Producer(hourse, 10); 
		    Producer p2 = new Producer(hourse, 10); 
		    Producer p3 = new Producer(hourse, 10); 
		    Producer p4 = new Producer(hourse, 10); 
		    Producer p5 = new Producer(hourse, 10); 
		    Producer p6 = new Producer(hourse, 10); 
		    Producer p7 = new Producer(hourse, 80); 
		    
		    c1.start(); 
		    c2.start(); 
		    c3.start(); 
		    c4.start(); 
		    c5.start(); 
		    c6.start(); 
		    
		    p1.start(); 
		    p2.start(); 
		    p3.start(); 
		    p4.start(); 
		    p5.start(); 
		    p6.start(); 
		    p7.start(); 
		}
	    
	}
}