获取多线程的方法有几种

答：传统的是继承thread类和实现runnable接口，java5以后又有实现callable接口和java的线程池获得

Callable和Runnable的对比

  1. //实现Runnable接口
  2. class MyThread1 implements Runnable{
  3.  @Override
  4.  public void run() {
  6.  }
  7. }
  8. //实现Callable接口
  9. class MyThread2 implements Callable<Integer>{
  10.  @Override
  11.  public Integer call() throws Exception {
  12.   return 200;
  13.  } 
  14. }

Callable接口与Runnable接口的区别

答：

  1. 是否有返回值
  2. 是否抛异常
  3. 落地方法不一样，一个是run，一个是call

    Callable的使用：

    ```java public class CallableTest { public static void main(String[] args) throws ExecutionException, InterruptedException {
    1.  FutureTask<String> stringFutureTask = new FutureTask<String>(new Thread1());
    2.  new Thread(stringFutureTask).start();
    3.  System.out.println(stringFutureTask.get());
    }

}

class Thread1 implements Callable{ @Override public String call() throws Exception { return “success”; } } ```