day 016 Thread

线程池

• 线程不需要新建销毁，降低资源消耗，实现资源重用

• 管理线程大小等

• ExecutorService Executors

• package pool;
  
  import java.util.concurrent.Callable;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.FutureTask;
  
  /**
   * @ Author     ：wwwzhqwww
   * @ Date       ：Created in 16:35 2021/1/20
   * @ Description：线程池
   * @ Modified By：
   * @Version: $version$
   */
  public class TestPool {
      public static void main(String[] args) {
          ExecutorService executorService = Executors.newFixedThreadPool(10);
          for (int i = 0; i < 10; i++) {
              executorService.execute(new MyThread());
          }
  
          executorService.shutdownNow();
          new MyThread3().start();
          FutureTask<Integer> futureTask =new FutureTask<Integer>(new MyThread2());
          new Thread(futureTask).start();
      }
  }
  class MyThread implements Runnable{
  
      @Override
      public void run() {
              System.out.println(Thread.currentThread().getName()+"线程：");
      }
  }
  class MyThread2 implements Callable<Integer>{
  
      @Override
      public Integer call() throws Exception {
          System.out.println("i am callable");
          return 100;
      }
  }
  class MyThread3 extends Thread{
      @Override
      public void run() {
          System.out.println("im thread");
      }
  }