Explain in detail the thread support of executorservice, callable and future in JDK

Explain in detail the thread support of executorservice, callable and future in JDK

1. Code background:

If there are thread1, thread2, thread3 and thread4 threads to count the sizes of C, D, e and f disks respectively, and all threads are counted and handed over to thread5 thread for summary, how should it be realized?

2. Code:

The code for counting the size of the "plate", which implements the callable interface in the JDK,

The code for statistical summary also implements the callable interface in the JDK,

Client: use executors. In JDK The newfixedthreadpool method creates executorservice. The submit method of executorservice receives the implementation of the callable interface. The JDK will be processed as a thread, and the future will be used to receive the return value of the submit method. When the future calls the get method, if the thread has not finished executing, the program is blocked here until the thread has finished executing.

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