[Java基础] java多线程关于消费者和生产者

  • Z时代
  • 2024-01-10
  • 分类：综合

java

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<String> blockingQueue = new LinkedBlockingQueue<String>(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<String> 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<String> blockingQueue;
 public Consumer1(BlockingQueue<String> 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<String> blockingQueue;
 public Productor2(BlockingQueue<String> 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<String> blockingQueue;
 public Productor3(BlockingQueue<String> 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<String> blockingQueue;
 public Productor4(BlockingQueue<String> 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<String> blockingQueue;
 public Productor5(BlockingQueue<String> 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

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