并发编程基础（第 四讲）

  Executor 框架

 

package test;

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

/**
 * * *  GOOK LUCK  * *
 *
 * @Author by   wukainian,
 * @Date on     2019/5/15.
 */
public class ExecutorsUser {
     public static void main(String[] args) {
         ExecutorService pool = Executors.newSingleThreadExecutor();
         ExecutorService pool1 = Executors.newCachedThreadPool();
         ExecutorService pool2 = Executors.newScheduledThreadPool(11);
         ExecutorService pool3 = Executors.newFixedThreadPool(111);
      }
}

 

 

 

 

 

有界队列

package concurrent018;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;



public class UseThreadPoolExecutor1 {


	public static void main(String[] args) {
		/**
		 * 在使用有界队列时，若有新的任务需要执行，如果线程池实际线程数小于corePoolSize，则优先创建线程，
		 * 若大于corePoolSize，则会将任务加入队列，
		 * 若队列已满，则在总线程数不大于maximumPoolSize的前提下，创建新的线程，
		 * 若线程数大于maximumPoolSize，则执行拒绝策略。或其他自定义方式。
		 * 
		 */	
		ThreadPoolExecutor pool = new ThreadPoolExecutor(
				1, 				//coreSize
				2, 				//MaxSize
				60, 			//60
				TimeUnit.SECONDS, 
				new ArrayBlockingQueue<Runnable>(3)			//指定一种队列 （有界队列）
				//new LinkedBlockingQueue<Runnable>()
				, new MyRejected()
				//, new DiscardOldestPolicy()
				);
		
		MyTask mt1 = new MyTask(1, "任务1");
		MyTask mt2 = new MyTask(2, "任务2");
		MyTask mt3 = new MyTask(3, "任务3");
		MyTask mt4 = new MyTask(4, "任务4");
		MyTask mt5 = new MyTask(5, "任务5");
		MyTask mt6 = new MyTask(6, "任务6");
		
		pool.execute(mt1);
		pool.execute(mt2);
//		pool.execute(mt3);
//		pool.execute(mt4);
//		pool.execute(mt5);
//		pool.execute(mt6);
		
		pool.shutdown();
		
	}
}

 

 

 

无界队列

package concurrent018;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

public class UseThreadPoolExecutor2 implements Runnable{

	private static AtomicInteger count = new AtomicInteger(0);
	
	@Override
	public void run() {
		try {
			int temp = count.incrementAndGet();
			System.out.println("任务" + temp);
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) throws Exception{
		//System.out.println(Runtime.getRuntime().availableProcessors());
		BlockingQueue<Runnable> queue = 
				//new LinkedBlockingQueue<Runnable>();
				new ArrayBlockingQueue<Runnable>(10);
		ExecutorService executor  = new ThreadPoolExecutor(
					5, 		//core
					10, 	//max
					120L, 	//2fenzhong
					TimeUnit.SECONDS,
					 );
		
		for(int i = 0 ; i < 20; i++){
			executor.execute(new UseThreadPoolExecutor2());
		}
		Thread.sleep(1000);
		System.out.println("queue size:" + queue.size());		//10
		Thread.sleep(2000);
	}


}

 

标签：四讲,java,concurrent,编程,util,并发,import,new,MyTask
来源： https://blog.csdn.net/weixin_41404773/article/details/90239844