juc-分支合并框架

package lock;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinTask;
import java.util.concurrent.RecursiveTask;

//分支合并
class MyTask extends RecursiveTask<Integer>{
    //拆分差值不超过10
    private static final Integer number = 10;
    private int begin;//拆分开始值
    private int end;//拆分结束值
    private int result;//返回结果

    //创建有参构造
    public MyTask(int begin,int end){
        this.begin=begin;
        this.end=end;
    }
    //拆分和合并过程
    @Override
    protected Integer compute() {
        //判断差值是否大于10 小于直接相加
        if (end-begin>=number){
            //相加操作
            for (int i = begin; i <= end ; i++) {
                result = result+i;
            }
        }else {//进一步拆分
            //获取数据中间值
            int middle = (begin+end)/2;
            //拆分左边
            MyTask task01 = new MyTask(begin,middle);
            //拆分右边
            MyTask task02 = new MyTask(middle,end);
            //调用方法拆分
            task01.fork();
            task02.fork();
            //合并结果
            result = task01.join() + task02.join();
        }
        return result;
    }
}
public class Lock_10 {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //创建MyTask对象
        MyTask myTask = new MyTask(0,100);
        //创建分支合并池对象
        ForkJoinPool forkJoinPool = new ForkJoinPool();
        ForkJoinTask<Integer> forkJoinTask = forkJoinPool.submit(myTask);
        //获取最终合并之后结果
        Integer integer = forkJoinTask.get();
        System.out.println(integer);
        //关闭池对象
        forkJoinPool.shutdown();

    }
}

　　fork是分支

　　join是合并