JUC_ForkJoin分支合并框架

清疚 2023-03-13 03:56 19阅读 0赞

# ForkJoinPool #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NoaWxsX0x5bg_size_16_color_FFFFFF_t_70]

# ForkJoinTask #

![在这里插入图片描述][20200511074427136.png]

# RecursiveTask #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NoaWxsX0x5bg_size_16_color_FFFFFF_t_70 1]

## demo-fibonacci ##

import java.util.concurrent.ExecutionException;
    import java.util.concurrent.ForkJoinPool;
    import java.util.concurrent.ForkJoinTask;
    import java.util.concurrent.RecursiveTask;
    
    public class FibonacciDemo extends RecursiveTask<Integer> {
        
    
        private int num;
    
        public FibonacciDemo(int num) {
        
            this.num = num;
        }
    
        /**
         * The main computation performed by this task.
         *
         * @return the result of the computation
         */
        @Override
        protected Integer compute() {
        
            if(num<=2){
        
                return 1;
            }
            FibonacciDemo fibonacciDemo=new FibonacciDemo(num-1);
            FibonacciDemo fibonacciDemo2=new FibonacciDemo(num-2);
            fibonacciDemo.fork();
            fibonacciDemo2.fork();
    
            return fibonacciDemo.join()+fibonacciDemo2.join();
        }
    
        public static void main(String[] args) throws ExecutionException, InterruptedException {
        
            ForkJoinPool forkJoinPool=new ForkJoinPool();
            FibonacciDemo fibonacciDemo=new FibonacciDemo(5);
            ForkJoinTask<Integer> forkJoinTask=forkJoinPool.submit(fibonacciDemo);
            System.out.println(forkJoinTask.get());
            forkJoinPool.shutdown();
        }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NoaWxsX0x5bg_size_16_color_FFFFFF_t_70]: /images/20230312/9f555f241d5e4ce9b2c209ee3fd80e47.png
[20200511074427136.png]: /images/20230312/cb35359f543044cd9b8e032eee768822.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NoaWxsX0x5bg_size_16_color_FFFFFF_t_70 1]: /images/20230312/5fa06269ad1249289ba930966238edab.png