Runnable和Callable的使用

package study;

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

public class day03_runnable和callable {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        Task1 task1 = new Task1();
        new Thread(task1).start();

        Task2 task2 = new Task2(10);
        FutureTask<Long> futureTask = new FutureTask<Long>(task2);
        new Thread(futureTask).start();  // FutureTask实现了Runnable, 所以可以传入Thread的构造函数

        Long result = futureTask.get(); // 死等计算完成结果
        System.out.println(result);
    }
}

class Task1 implements Runnable {
    @Override
    public void run() {
        System.out.println("Runnable");
    }
}

class Task2 implements Callable<Long> {
    private long num;

    public Task2(int num) {
        this.num = num;
    }

    @Override
    public Long call() throws Exception {
        return this.num + 10;
    }
}