Java语言程序设计-进阶篇（八）多线程与并行程序设计【实例】

最新推荐文章于 2024-03-17 19:28:27 发布

原创最新推荐文章于 2024-03-17 19:28:27 发布 · 364 阅读

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#java #多线程 #实例 #线程协作

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本文通过一个Java程序展示了多线程环境下生产者消费者问题的解决，使用了`Buffer`类和`ExecutorService`进行线程协作。程序中，`produceTask`不断写入数据到缓冲区，而`consumerTask`负责删除数据，当缓冲区满或空时，线程会等待相应条件。

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package test;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ConsumerProducer {
	private static Buffer buffer = new Buffer();
	public static void main(String args[]){
		ExecutorService exe = Executors.newFixedThreadPool(2);
		exe.execute(new produceTask());
		exe.execute(new consumerTask());
		exe.shutdown();
		
	}
	
	public static class produceTask implements Runnable{

		@Override
		public void run() {
			int i = 1;
			try{
				while(true){
					System.out.println("produce write"+i);
					buffer.write(i++);
					Thread.sleep((int) (Math.random()+1000));
				}
			}
			catch(InterruptedException ex){
				ex.printStackTrace();
			}
			
		}
		
	}
	
	public static class consumerTask implements Runnable{

		@Override
		public void run() {
			try{
				while(true){
					System.out.println("\t\tconsumer delete "+buffer.remove());
					buffer.remove();
					Thread.sleep((int) (Math.random()+1000));
				}
			}
			catch(InterruptedException ex){
				ex.printStackTrace();
			}
			
		}
		
	}
}

package test;


import java.util.LinkedList;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;


public class Buffer {
	int CAPACITY = 1;
	private LinkedList<Integer> myquene = new LinkedList<>();
	private static Lock lock = new ReentrantLock();
	private static Condition notempty = lock.newCondition();
	private static Condition notfull = lock.newCondition();
	
	public int remove() {
		int value = 0;
		lock.lock();
		try{
			while(myquene.isEmpty()){
				System.out.println("\t\twait for notempty conditon");
				notempty.await();
			}
			value = myquene.remove();
			notfull.signal();
		}
		catch(InterruptedException ex){
			ex.printStackTrace();
		}
		finally{
			lock.unlock();
			return value;
		}
		
	}


	public void write(int i) {
		lock.lock();
		try{
			while(myquene.size() == CAPACITY){
				System.out.println("wait for not full condition");
				notfull.await();
			}
			myquene.offer(i);
			notempty.signal();
		}	
		catch(InterruptedException ex){
			ex.printStackTrace();
		}
		finally{
			lock.unlock();
		}
		
		
		
	}


}

程序运行的结果如下所示

produce write1
		consumer delete 1
		wait for notempty conditon
produce write2
produce write3
		wait for notempty conditon
		consumer delete 3
		wait for notempty conditon
produce write4
		wait for notempty conditon
produce write5
		consumer delete 5
		wait for notempty conditon
produce write6
produce write7
		wait for notempty conditon
		consumer delete 7
		wait for notempty conditon
produce write8
produce write9
		wait for notempty conditon
		consumer delete 9
		wait for notempty conditon
produce write10
		wait for notempty conditon
produce write11
		consumer delete 11
		wait for notempty conditon
produce write12
		wait for notempty conditon
produce write13
		consumer delete 13
		wait for notempty conditon
produce write14
produce write15
		consumer delete 15
		wait for notempty conditon
produce write16
		wait for notempty conditon
produce write17
		consumer delete 17
		wait for notempty conditon
produce write18
		wait for notempty conditon
produce write19
		consumer delete 19
		wait for notempty conditon
produce write20
		wait for notempty conditon
produce write21
		consumer delete 21
		wait for notempty conditon
produce write22
produce write23
		wait for notempty conditon
		consumer delete 23
		wait for notempty conditon
produce write24
		wait for notempty conditon
produce write25
		consumer delete 25
		wait for notempty conditon
produce write26
produce write27
		wait for notempty conditon
		consumer delete 27
		wait for notempty conditon
produce write28
		wait for notempty conditon
produce write29
		consumer delete 29
		wait for notempty conditon