标签:await ace void pre stack tac throws integer eth
1.使用wait()/notifyAll实现生产者和消费者
1 /** 2 * 锁对象类 3 * 协作类 4 */ 5 public class MyQueue { 6 private Queue<Integer> queue; 7 private int limit; 8 9 public MyQueue(int limit) { 10 this.queue = new ArrayDeque<>(limit); 11 this.limit = limit; 12 } 13 14 public synchronized void put(int n) throws InterruptedException { 15 while (queue.size()==limit){ 16 wait(); 17 } 18 queue.add(n); 19 /** 20 * 通知所有queue上的线程(消费者线程,生产者线程) 21 */ 22 notifyAll(); 23 } 24 public synchronized int get() throws InterruptedException { 25 while (queue.isEmpty()){ 26 wait(); 27 } 28 int e=queue.poll(); 29 /** 30 * 通知所有queue上的线程(消费者线程,生产者线程) 31 */ 32 notifyAll(); 33 return e; 34 } 35 }
1 /** 2 * 生产者线程 3 */ 4 public class ProduceThread extends Thread { 5 private MyQueue queue; 6 7 public ProduceThread(MyQueue queue) { 8 this.queue = queue; 9 } 10 11 @Override 12 public void run() { 13 int num=0; 14 while (true){ 15 try { 16 System.out.println("生产数据:" + num); 17 queue.put(num); 18 num++; 19 Thread.sleep((int)(Math.random()*100)); 20 } catch (InterruptedException e) { 21 e.printStackTrace(); 22 } 23 } 24 } 25 }
1 /** 2 * 消费者线程 3 */ 4 public class ConsumerThread extends Thread { 5 private MyQueue queue; 6 7 public ConsumerThread(MyQueue queue) { 8 this.queue = queue; 9 } 10 11 @Override 12 public void run() { 13 while (true){ 14 try { 15 int res=queue.get(); 16 System.out.println("消费数据:"+res); 17 Thread.sleep((int)(Math.random()*100)); 18 } catch (InterruptedException e) { 19 e.printStackTrace(); 20 } 21 } 22 } 23 }
1 /** 2 * 主线程 3 */ 4 public class MainTest { 5 public static void main(String[] args) { 6 MyQueue queue=new MyQueue(100); 7 new ProduceThread(queue).start(); 8 new ConsumerThread(queue).start(); 9 } 10 }
2.使用ReentrantLock和condition实现生产者和消费者功能
1 /** 2 * 协作类 3 */ 4 public class MyBlockQueue { 5 private Queue<Integer> queue=null; 6 private int limit; 7 private Lock lock=new ReentrantLock(); 8 private Condition produceCondition =lock.newCondition(); 9 private Condition ConsumerCondition =lock.newCondition(); 10 11 public MyBlockQueue(int limit) { 12 this.limit = limit; 13 queue=new ArrayDeque<>(limit); 14 } 15 public void put(int n) throws InterruptedException { 16 lock.lockInterruptibly();//可中断锁 17 try { 18 while (queue.size()==limit){ 19 produceCondition.await(); 20 } 21 queue.add(n); 22 ConsumerCondition.signal(); 23 }finally { 24 lock.unlock(); 25 } 26 } 27 28 29 public int get() throws InterruptedException { 30 lock.lockInterruptibly(); 31 try { 32 while (queue.isEmpty()){ 33 ConsumerCondition.await(); 34 } 35 int e=queue.poll(); 36 produceCondition.signal(); 37 return e; 38 }finally { 39 lock.unlock(); 40 } 41 } 42 }
1 /** 2 * 生产者线程 3 */ 4 public class ProduceThread extends Thread { 5 private MyBlockQueue queue; 6 7 public ProduceThread(MyBlockQueue queue) { 8 this.queue = queue; 9 } 10 11 @Override 12 public void run() { 13 int num=0; 14 while (true){ 15 try { 16 System.out.println("生产数据:" + num); 17 queue.put(num); 18 num++; 19 Thread.sleep((int)(Math.random()*100)); 20 } catch (InterruptedException e) { 21 e.printStackTrace(); 22 } 23 } 24 } 25 }
1 /** 2 * 消费者线程 3 */ 4 public class ConsumerThread extends Thread { 5 private MyBlockQueue queue; 6 7 public ConsumerThread(MyBlockQueue queue) { 8 this.queue = queue; 9 } 10 11 @Override 12 public void run() { 13 while (true){ 14 try { 15 int res=queue.get(); 16 System.out.println("消费数据:"+res); 17 Thread.sleep((int)(Math.random()*100)); 18 } catch (InterruptedException e) { 19 e.printStackTrace(); 20 } 21 } 22 } 23 }
1 /** 2 * 主线程 3 */ 4 public class MainTest { 5 public static void main(String[] args) { 6 MyBlockQueue queue=new MyBlockQueue(100); 7 new ProduceThread(queue).start(); 8 new ConsumerThread(queue).start(); 9 } 10 }
分析:wait/notify只能实现一个条件队列;准备唤醒生产者队列,却把消费者也唤醒了;相互竞争后最终生产者满足条件,开始执行,消费者再次变成等待状态。
而使用显示锁,则可以创建多条等待队列。
java利用多线程实现生产者和消费者功能————美的掉渣的代码
标签:await ace void pre stack tac throws integer eth
原文地址:https://www.cnblogs.com/guoyansi19900907/p/13335224.html