5.JUC线程高级-创建线程的第三种方式实现 Callable接口

package com.pyy.juc;


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

public class TestCallable {

    public static void main(String[] args) {
        ThreadCallableDemo tcd = new ThreadCallableDemo();

        // 执行Callable方式，需要FutureTask 实现类的支持，用于接收运算结果。
        FutureTask<Integer> result = new FutureTask<>(tcd);

        new Thread(result).start();

        // 获取线程执行后的结果
        try {
            Integer sum = result.get();
            System.out.println(sum);
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        }
    }
}

class ThreadCallableDemo implements Callable<Integer> {

    @Override
    public Integer call() throws Exception {
        int sum = 0;

        for(int i = 0; i <= 100; i++) {
            sum += i;
        }
        return sum;
    }
}