1.创建线程的四种方式

写main方法

public static void main(String[] args) throws ExecutionException, InterruptedException {
         System.out.println("main......start.....");
         Thread thread = new Thread01();
         thread.start();
         System.out.println("main......end.....");
    }

继承Thread

 public static class Thread01 extends Thread {
        @Override
        public void run() {
            System.out.println("当前线程：" + Thread.currentThread().getId());
            int i = 10 / 2;
            System.out.println("运行结果：" + i);
        }
    }

实现Runnable接口

public static class Runable01 implements Runnable {
        @Override
        public void run() {
            System.out.println("当前线程：" + Thread.currentThread().getId());
            int i = 10 / 2;
            System.out.println("运行结果：" + i);
        }
    }

实现Callable接口

public static class Callable01 implements Callable<Integer> {
        @Override
        public Integer call() throws Exception {
            System.out.println("当前线程：" + Thread.currentThread().getId());
            int i = 10 / 2;
            System.out.println("运行结果：" + i);
            return i;
        }
    }

通过FutureTask来开启线程

         FutureTask<Integer> futureTask = new FutureTask<>(new Callable01());
         new Thread(futureTask).start();
         System.out.println(futureTask.get());

线程池

//线程池，每个系统应该有一个共有的有一个或者是有两个
    public static ExecutorService executor = Executors.newFixedThreadPool(10);

ExecutorService service = Executors.newFixedThreadPool(10);
         service.execute(new Runable01());
         Future<Integer> submit = service.submit(new Callable01());
         submit.get();