Java 创建线程的3种方法及各自的优点

 class MyThread extends Thread {
   //重写run方法，线程运行后，跑的就是run方法 
   public void run(){
     //System.out.println("");
   }
  
   public static void main(String[] args){
     Thread t1 = new MyThread();
        t1.start(); //线程运行,调用的 run()方法.
   }
 }

 class TestThread implements Runnable{
  
   @Override
   public void run() {
     // implement run method here 
     //System.out.println("");
   }
  
   public static void main() {
     final TestThread obj = new TestThread();
     Thread t1 = new Thread(obj);
     t1.start();
   }
 
 }

class MyCallable implements Callable {
  @Override
  public Integer call() throws Exception {
    int sum = 0;
    for (int i = 1; i <= 100; i++) {
      sum += i;
    }
    return sum;
  }

  public static void main(String[] args) throws Exception {
    MyCallable mc = new MyCallable(); //实例化 callable

    FutureTask oneTask = new FutureTask(mc); //用FutureTask包裹
    Thread oneThread = new Thread(oneTask); //用Thread包裹
    oneThread.start();
    System.out.print(oneTask.get()); //获取返回值
  }
}

FutureTask<Integer> task=new FutureTask<Integer>(()->{
  throw new Exception("自定义异常");
});
 
new Thread(task).start();
 
try {
  System.out.println(task.get());
} catch (Exception e) {
  System.out.println(e.getMessage());
}

 ExecutorService es = Executors.newCachedThreadPool();
 Runnable r = <your runnable here>;
 es.execute(r);