On the wonderful use of future in Java multithreading (with source code)

In Java, future is a future object, which stores the processing results of this thread. It is like a delivery voucher. With it, you can extract the results at any time. In both cases, leaving future is almost difficult. One case is to split orders. For example, your application receives a batch order. At this time, if the fastest order processing is required, it needs to be processed concurrently. If the concurrent results are collected, it will be very cumbersome to program by yourself. At this time, you can use completionservice to solve this problem. Completionservice collects the future into a queue, which can be queued according to the order in which the result processing is completed. In another case, if you need to query some things (such as crawlers) concurrently, as long as one result of the concurrent query returns, you will think that the query has been found and end the query. At this time, you also need to use completionservice and future. Directly, the code is more straightforward:

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The above is all about the wonderful use of future in Java multithreading. I hope it will be helpful to you. Interested friends can refer to: detailed explanation of Java multithreading forkjoinpool instance, Java understanding multithreading through ticket selling, Java using future to obtain multithreading operation results in time, etc. you can leave a message at any time. Welcome to exchange and discuss.