经典问题-生产者和消费者

下面的代码是只能生产和消费1个产品，如果是多个就需要修改标志位和循环条件。

 

去除代码中的注释部分，可以帮助你理解多线程的操作原理。

 

修改多个产品可以添加

private final int maxNumber;

private int currentNum;

 

while(currentNum == maxNumber) {

   produece waiting 

}

 

......

可以使用vector保存产品。

 

 

package com;public abstract class AbstractProduct {/** 产品号 */public String productId;public String getProductId() {return productId;}public void setProductId(String productId) {this.productId = productId;}public String toString() {return productId;}}

 

 

package com;public class Consumer implements Runnable {private Store store;public Store getStore() {return store;}public void setStore(Store store) {this.store = store;}public void run() {while(true) {AbstractProduct product = this.store.getProduct();}}}

 

 

package com;public class Others implements Runnable {public void run() {while(true) {System.out.println(Thread.currentThread().getId() + " others thread");}}}

 

package com;public class Produce implements Runnable {private Store store;public Store getStore() {return store;}public void setStore(Store store) {this.store = store;}public void run() {for(int i = 1; i < 5; i++) {AbstractProduct product = new Product(String.valueOf(i));this.store.putProduct(product);}}}

 

 

package com;public class Product extends AbstractProduct {public Product(String productId) {this.productId = productId;}private Store store;public Store getStore() {return store;}public void setStore(Store store) {this.store = store;}}

 

 

 

package com;public class Store {private boolean flag;private AbstractProduct product;public synchronized void putProduct(AbstractProduct product) {System.out.println(Thread.currentThread().getName() + " ready put");while(flag) {try {System.out.println(Thread.currentThread().getName() + " put waiting ...");//System.out.println(Thread.currentThread().getName() + " begin sleep");//Thread.currentThread().sleep(100);//System.out.println(Thread.currentThread().getName() + " get up");this.wait(1000);} catch (InterruptedException e) {e.printStackTrace();}}flag = true;this.product = product;System.out.println(Thread.currentThread().getName() + " puted " + product );this.notifyAll();}public synchronized AbstractProduct getProduct() {System.out.println(Thread.currentThread().getName() + " ready get");while(!flag) {System.out.println(Thread.currentThread().getName() + " get waiting");try {this.wait(1000);} catch (InterruptedException e) {e.printStackTrace();}}flag = false;System.out.println(Thread.currentThread().getName() + " geted " + product);this.notifyAll();return product;}}

 

 

package com;public class Test {/** * @param args */public static void main(String[] args) {Store store = new Store();Produce produce = new Produce();produce.setStore(store);(new Thread(produce)).start();Consumer consumer = new Consumer();consumer.setStore(store);(new Thread(consumer)).start();//Others others = new Others();//(new Thread(others)).start();}}

 

 

 

测试结果：

 

 

Thread-1 ready putThread-1 puted 1Thread-1 ready putThread-1 put waiting ...Thread-2 ready getThread-2 geted 1Thread-2 ready getThread-2 get waitingThread-1 puted 2Thread-1 ready putThread-1 put waiting ...Thread-2 geted 2Thread-2 ready getThread-2 get waitingThread-1 puted 3Thread-1 ready putThread-1 put waiting ...Thread-2 geted 3Thread-2 ready getThread-2 get waitingThread-1 puted 4Thread-2 geted 4Thread-2 ready getThread-2 get waitingThread-2 get waitingThread-2 get waitingThread-2 get waitingThread-2 get waitingThread-2 get waitingThread-2 get waitingThread-2 get waiting

 

 

修改代码:

package com;public class Others implements Runnable {public void run() {while(true) {try {Thread.sleep(1000);System.out.println(Thread.currentThread().getName() + " others thread");} catch (InterruptedException e) {e.printStackTrace();}}}}

package com;public class Test {/** * @param args */public static void main(String[] args) {Store store = new Store();Produce produce = new Produce();produce.setStore(store);(new Thread(produce)).start();Consumer consumer = new Consumer();consumer.setStore(store);(new Thread(consumer)).start();Others others = new Others();(new Thread(others)).start();}}

 

Thread-1 ready putThread-1 puted 1Thread-1 ready putThread-1 put waiting ...Thread-2 ready getThread-2 geted 1Thread-2 ready getThread-2 get waitingThread-1 puted 2Thread-1 ready putThread-1 put waiting ...Thread-2 geted 2Thread-2 ready getThread-2 get waitingThread-1 puted 3Thread-1 ready putThread-1 put waiting ...Thread-2 geted 3Thread-2 ready getThread-2 get waitingThread-1 puted 4Thread-2 geted 4Thread-2 ready getThread-2 get waitingThread-3 others threadThread-2 get waitingThread-3 others threadThread-2 get waitingThread-3 others threadThread-2 get waitingThread-3 others threadThread-2 get waitingThread-3 others threadThread-2 get waitingThread-3 others threadThread-2 get waitingThread-3 others threadThread-2 get waiting

 

 

你可以看看多个生产者的情况：

package com;public class Test {/** * @param args */public static void main(String[] args) {Store store = new Store();Produce produce = new Produce();produce.setStore(store);(new Thread(produce)).start();Consumer consumer = new Consumer();consumer.setStore(store);(new Thread(consumer)).start();Others others = new Others();(new Thread(others)).start();Produce produce1 = new Produce();produce1.setStore(store);(new Thread(produce1)).start();}}

 

Thread-1 ready putThread-1 puted 1Thread-1 ready putThread-1 put waiting ...Thread-2 ready getThread-2 geted 1Thread-2 ready getThread-2 get waitingThread-4 ready putThread-4 puted 1Thread-4 ready putThread-4 put waiting ...Thread-1 put waiting ...Thread-2 geted 1Thread-2 ready getThread-2 get waitingThread-1 puted 2Thread-1 ready putThread-1 put waiting ...Thread-4 put waiting ...Thread-2 geted 2Thread-2 ready getThread-2 get waitingThread-4 puted 2Thread-4 ready putThread-4 put waiting ...Thread-1 put waiting ...Thread-2 geted 2Thread-2 ready getThread-2 get waitingThread-4 puted 3Thread-4 ready putThread-4 put waiting ...Thread-1 put waiting ...Thread-2 geted 3Thread-2 ready getThread-2 get waitingThread-4 puted 4Thread-1 put waiting ...Thread-2 geted 4Thread-2 ready getThread-2 get waitingThread-1 puted 3Thread-1 ready putThread-1 put waiting ...Thread-2 geted 3Thread-2 ready getThread-2 get waitingThread-1 puted 4Thread-2 geted 4Thread-2 ready getThread-2 get waitingThread-3 others threadThread-2 get waitingThread-3 others threadThread-2 get waitingThread-3 others threadThread-2 get waiting