ForkJoinPool中递归任务和递归操作之间的区别

Question

We can submit two types of tasks to forkJoinPool . one is RecursiveAction and other is RecursiveTask .

What is the difference between both of them?

Answer 1

From the first lines of their respective Javadocs:

• [ RecursiveTask is] A recursive result-bearing ForkJoinTask.
• [ RecursiveAction is] A recursive resultless ForkJoinTask.

Although technically, RecursiveAction does return a value, it's just always null , because it's a ForkJoinTask<Void> , and that's the only possible value of Void .

Answer 2

它们是相似的，除了RecursiveTask返回结果而RecursiveAction没有返回值。