启动线程

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一、Executors 启动线程
1、newSingleThreadExecutor ：

适用于在另一个线程中连续运行的任何事物（长期存货的任务），例如监听套接字的连接任务 TIJ1122, 如果向
SingleThreadExecutor提交了多个任务，那么这些人物将会排队，一个个执行

代码：

  class MyRunnable implements Runnable {        final int id = taskId++;        @Override        public void run() {            System.out.print("  I AM  " + id);            Thread.yield();            System.out.print("  I AM " + id);            Thread.yield();            System.out.print("  I AM " + id);            Thread.yield();            System.out.println("  I AM " + id);            Thread.yield();        }    }

  ExecutorService exec = Executors.newSingleThreadExecutor();        for (int i = 0; i < 5; i++)            exec.submit(new Test().new MyRunnable());        exec.shutdown();

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2、CachedThreadPool

    ExecutorService exec = Executors.newCachedThreadPool();

FixedThreadPool类似