java线程池测试

package com.company;

import java.util.concurrent.*;

public class 线程池 {
    public static void main(String[] args) {
        long start = System.currentTimeMillis();

        ExecutorService executor = Executors.newFixedThreadPool(1000);
        for (int i = 1000; i <= 50000; i++) {
            try {
                System.out.println(executor.submit(new MyCallable(i)).get());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        executor.shutdown();

        /*
        try {

            for (int i = 1000; i <= 50000; i++) {
                int sum = 0;
                for (int j = 0; j <= i; j++) {
                    sum += j;
                }
                Thread.sleep(10);
                System.out.println(sum);
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
         */

        long end = System.currentTimeMillis();
        System.out.println(end - start);
    }
}

class MyCallable implements Callable<Integer> {
    private int n;

    public MyCallable(int n) {
        this.n = n;
    }

    @Override
    public Integer call() throws Exception {
        int sum = 0;
        for (int i = 0; i <= n; i++) {
            sum += i;
        }
        Thread.sleep(1);
        return sum;
    }
}