FutureTask初尝试

package JavaDay6_02;

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

/**
 * @author myvina@qq.com
 * @date 18-6-2  上午9:53
 */

public class Demo2 {
    private final FutureTask<Integer> futureTask = new FutureTask<Integer>(new Callable<Integer>() {
        @Override
        public Integer call() throws Exception {
            System.out.println("（预加载线程输出）开始计算...");
            Thread.sleep(2000);
            System.out.println("（预加载线程输出）计算完成...");
            return Integer.MAX_VALUE;
        }
    });
    private final Thread thread = new Thread(futureTask);

    public void start() { thread.start();}

    public int get() throws ExecutionException, InterruptedException {
        return futureTask.get();
    }

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        Demo2 demo2 = new Demo2();

        System.out.println("（主线程输出）预加载...");
        demo2.start();

        Thread.sleep(1000);
        System.out.println("（主线程输出）计算结果为（如果没计算出来则等待）：");
        System.out.println("（主线程输出）计算结果为：" + demo2.get());
    }
}

    运行结果为：