多线程： 生产与消费 1.生产者Producer生产produce产品，并将产品放到库存inventory里；同时消费者Consumer从库存inventory里消费consume产品。 2.库存inventory的总量（最大库存量100）是有限的。如果库存inventory满了，生产者不能在库存inventory继续生产produce产品，须等待状态。等待产品被消费者Consumer消费consume了，再往库存inventory生产produce产品。 3.若库存inventory空了，消费者Consumer也须等待状态。等待生产者生产produce产品，再将消费者Consumer唤醒进行消费consume。 补充要求：需要6个线程，分别实现 1.库存为0；2.消费1消费10个（但库存零，则需等待）；3.生产2生产5个；4.生产3生产5个（此时库存有10个，则满足消费1的消费；）最终库存仍有0个；5.生产4生产100个）；6.生产5生产10个（因库存满了，无法生产，需等待）
import java.util.concurrent.BlockingQueue;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.LinkedBlockingQueue; public class BlockingQueueTest { public static void main(String[] args) { ExecutorService service = Executors.newCachedThreadPool(); BlockingQueue blockingQueue = new LinkedBlockingQueue (100); System.out.println("blockingQueue now contains " + blockingQueue.size() + " unit"); service.submit(new Consumer1(blockingQueue)); gap(blockingQueue); service.submit(new Productor2(blockingQueue)); gap(blockingQueue); service.submit(new Productor3(blockingQueue)); gap(blockingQueue); service.submit(new Productor4(blockingQueue)); gap(blockingQueue); service.submit(new Productor5(blockingQueue)); gap(blockingQueue); service.shutdown(); } private static void gap(BlockingQueue blockingQueue) { try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("blockingQueue now contains " + blockingQueue.size() + " unit"); }}class Consumer1 implements Runnable{ BlockingQueue blockingQueue; public Consumer1(BlockingQueue blockingQueue) { super(); this.blockingQueue = blockingQueue; } @Override public void run() { // TODO Auto-generated method stub System.out.println("Consumer1 start: need 10 units"); for(int i = 0; i < 10; i++){ try { blockingQueue.take(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println("Consumer1 end: has got 10 units"); } }class Productor2 implements Runnable{ BlockingQueue blockingQueue; public Productor2(BlockingQueue blockingQueue) { super(); this.blockingQueue = blockingQueue; } @Override public void run() { // TODO Auto-generated method stub System.out.println("Productor2 start: put 5 units"); for(int i = 0; i < 5; i++){ try { blockingQueue.put("Object"); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println("Productor2 end: has put 5 units"); } }class Productor3 implements Runnable{ BlockingQueue blockingQueue; public Productor3(BlockingQueue blockingQueue) { super(); this.blockingQueue = blockingQueue; } @Override public void run() { // TODO Auto-generated method stub System.out.println("Productor3 start: put 5 units"); for(int i = 0; i < 5; i++){ try { blockingQueue.put("Object"); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println("Productor3 end: has put 5 units"); } }class Productor4 implements Runnable{ BlockingQueue blockingQueue; public Productor4(BlockingQueue blockingQueue) { super(); this.blockingQueue = blockingQueue; } @Override public void run() { // TODO Auto-generated method stub System.out.println("Productor4 start: put 100 units"); for(int i = 0; i < 100; i++){ try { blockingQueue.put("Object"); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println("Productor4 end: has put 100 units"); } }class Productor5 implements Runnable{ BlockingQueue blockingQueue; public Productor5(BlockingQueue blockingQueue) { super(); this.blockingQueue = blockingQueue; } @Override public void run() { // TODO Auto-generated method stub System.out.println("Productor5 start: put 10 units"); for(int i = 0; i < 100; i++){ try { blockingQueue.put("Object"); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println("Productor5 end: has put 10 units"); } } 每个线程是隔了1s启动的, 结果
blockingQueue now contains 0 unit
Consumer1 start: need 10 units blockingQueue now contains 0 unit Productor2 start: put 5 units Productor2 end: has put 5 units blockingQueue now contains 0 unit Productor3 start: put 5 units Productor3 end: has put 5 units Consumer1 end: has got 10 units blockingQueue now contains 0 unit Productor4 start: put 100 units Productor4 end: has put 100 units blockingQueue now contains 100 unit Productor5 start: put 10 units blockingQueue now contains 100 unit