public class MyThread extends Thread {
 @Override
 publicvoid run() {
 System.out.println(Thread.currentThread().getName() + "正在执行");
 }
}

ExecutorService pool = Executors. newSingleThreadExecutor();
 Thread t1 = new MyThread();
 Thread t2 = new MyThread();
 Thread t3 = new MyThread();
 //将线程放入池中进行执行
 pool.execute(t1);
 pool.execute(t2);
 pool.execute(t3);
 //关闭线程池
 pool.shutdown();

pool-1-thread-1正在执行
pool-1-thread-1正在执行
pool-1-thread-1正在执行

ExecutorService pool = Executors.newFixedThreadPool(3);
Thread t1 = new MyThread();
 Thread t2 = new MyThread();
 Thread t3 = new MyThread();
 Thread t4 = new MyThread();
 Thread t5 = new MyThread();
 //将线程放入池中进行执行
 pool.execute(t1);
 pool.execute(t2);
 pool.execute(t3);
 pool.execute(t4);
 pool.execute(t5);
pool.shutdown();

pool-1-thread-1正在执行
pool-1-thread-2正在执行
pool-1-thread-1正在执行
pool-1-thread-2正在执行

ExecutorService pool = Executors.newCachedThreadPool();
 Thread t1 = new MyThread();
 Thread t2 = new MyThread();
 Thread t3 = new MyThread();
 Thread t4 = new MyThread();
 Thread t5 = new MyThread();
 //将线程放入池中进行执行
 pool.execute(t1);
 pool.execute(t2);
 pool.execute(t3);
 pool.execute(t4);
 pool.execute(t5);
 //关闭线程池
 pool.shutdown();

pool-1-thread-2正在执行
pool-1-thread-4正在执行
pool-1-thread-3正在执行
pool-1-thread-1正在执行
pool-1-thread-5正在执行

ScheduledExecutorService pool = Executors.newScheduledThreadPool(2);
pool.scheduleAtFixedRate(new Runnable() {//每隔一段时间就触发异常
  @Override
  public void run() {
   //throw new RuntimeException();
   System.out.println("================");
  }
 }, 1000, 2000, TimeUnit.MILLISECONDS);
pool.scheduleAtFixedRate(new Runnable() {//每隔一段时间打印系统时间，证明两者是互不影响的
  @Override
  public void run() {
   System.out.println("+++++++++++++++++");
  }
 }, 1000, 2000, TimeUnit.MILLISECONDS);

================
+++++++++++++++++
+++++++++++++++++
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