线程池（用于处理Runnable任务或Callable任务）

一，线程池

二， 如何创建线程池

 

案例： 

 //1,通过ThreadPoolExecuter创建一个线程池对象
        ExecutorService pool = new ThreadPoolExecutor(3,5,8,
                TimeUnit.SECONDS,
                new LinkedBlockingQueue<>(4),
                Executors.defaultThreadFactory(),
                new ThreadPoolExecutor.AbortPolicy());

 

三，处理Runnable任务 

超过了最大线程量后的处理方法： 

 

 四，案例

package XianChengChildren;

import java.util.concurrent.*;

public class ThewadPoolTest1 {
    public static void main(String[] args) {
        //1,通过ThreadPoolExecuter创建一个线程池对象
        ExecutorService pool = new ThreadPoolExecutor(3,5,8,
                TimeUnit.SECONDS,
                new LinkedBlockingQueue<>(4),
                Executors.defaultThreadFactory(),
                new ThreadPoolExecutor.AbortPolicy());
        //2,处理Runnable任务
        Runnable target =new MyRunnable();
        //执行任务 execute
        pool.execute(target);
        pool.execute(target);
        pool.execute(target);
        pool.execute(target);
        pool.execute(target);
        pool.execute(target);
        //执行完后关闭线程池
        pool.shutdown();
        //立刻关闭，不管临时任务
        //pool.shutdownNow();

    }
}

package XianChengChildren;

public class MyRunnable implements  Runnable{
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+"===>输出666~~");
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

 

五，处理Callable任务 

 

六，案例

 

package XianChengChildren;

import java.util.concurrent.*;

public class ThewadPoolTest1 {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //1,通过ThreadPoolExecuter创建一个线程池对象
        ExecutorService pool = new ThreadPoolExecutor(3,5,8,
                TimeUnit.SECONDS,
                new LinkedBlockingQueue<>(4),
                Executors.defaultThreadFactory(),
                new ThreadPoolExecutor.AbortPolicy());
        //2,处理Callable任务
       Future f1 = pool.submit(new MyRunnable(100));
       Future f2 = pool.submit(new MyRunnable(200));
       Future f3 = pool.submit(new MyRunnable(300));
       Future f4 = pool.submit(new MyRunnable(400));

        System.out.println(f1.get());
        System.out.println(f2.get());
        System.out.println(f3.get());
        System.out.println(f4.get());



    }
}

package XianChengChildren;

import java.util.concurrent.Callable;

public class MyRunnable implements Callable {
    private int n;

    public MyRunnable(int n) {
        this.n = n;
    }

    @Override
    public Object call() throws Exception {
        int sum=0;
        for (int i = 0; i <=n ; i++) {
            sum+=1;
        }
        return Thread.currentThread().getName()+"线程求出了1-"+n+"的和是"+sum;
    }
}