FutureTask用于闭锁

package com.yanxizhu;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

/**
 * @description: FutureTask可用于闭锁
 * @date: 2022/3/19 11:48
 * @version: 1.0
 */
public class FutureTaskDemo {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        myFutureTask myFutureTask = new myFutureTask();
        FutureTask<Integer> futureTask = new FutureTask<>(myFutureTask);
        new Thread(futureTask).start();
        //必须等线程执行完，才执行下面的代码，因此FutureTask可用于闭锁
        Integer integer = futureTask.get();
        System.out.println("integer="+integer);
        System.out.println("=======================");

    }

    public static class myFutureTask implements Callable<Integer>{

        @Override
        public Integer call() throws Exception {
            int i=1;
            for(;i<1000000;i++){
                i++;
            }
            return i;
        }
    }
}