ForkJoin学习

package com.king.forkjoin;

import java.util.concurrent.RecursiveAction;
import java.util.concurrent.RecursiveTask;



public class ForkJoinDemo extends RecursiveTask {
    private Long start;
    private Long end;
    private Long temp = 10000L;

    public ForkJoinDemo(Long start, Long end) {
        this.start = start;
        this.end = end;
    }

    //计算方法
    @Override
    protected Long compute() {
        if ((end-start) 
package com.king.forkjoin;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinTask;
import java.util.stream.LongStream;



public class Test {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        test3();
    }

    //普通方法
    public static void test1(){
        Long sum = 0L;
        long start = System.currentTimeMillis();
        for (Long i = 1L; i < 10_0000_0000; i++) {
            sum+=i;
        }
        long end = System.currentTimeMillis();
        System.out.println("sum="+sum+"时间:"+(end-start));
    }

    //ForkJoin方法
    public static void test2() throws ExecutionException, InterruptedException {
        long start = System.currentTimeMillis();
        ForkJoinPool forkJoinPool = new ForkJoinPool();
        ForkJoinTask task = new ForkJoinDemo(0L, 10_0000_0000L);
        forkJoinPool.execute(task); //执行
        ForkJoinTask submit = forkJoinPool.submit(task);//提交
        Long sum = submit.get();

        long end = System.currentTimeMillis();
        System.out.println("sum="+sum+"时间:"+(end-start));
    }
    public static void test3(){
        long start = System.currentTimeMillis();
        //Stream并行流
        long sum = LongStream.rangeClosed(0L, 10_0000_0000L).parallel().reduce(0, Long::sum);
        long end = System.currentTimeMillis();
        System.out.println("sum="+sum+"时间:"+(end-start));
    }
}