Java: concurrency with Runnable

In this simple tutorial we will see how to process some work in multiple threads using limited pool of x threads. Please note that there is an overhead in using threads.

You could use number of available CPUs as your pool size.

Result:

CPUs 8

thread with value 1 current sum 3

thread with value 2 current sum 3

thread with value 3 current sum 6

thread with value 4 current sum 10

thread with value 5 current sum 15

thread with value 6 current sum 21

thread with value 7 current sum 28

thread with value 8 current sum 36

final sum 120

thread with value 11 current sum 66

thread with value 13 current sum 91

thread with value 15 current sum 120

thread with value 9 current sum 45

thread with value 14 current sum 105

thread with value 12 current sum 78

thread with value 10 current sum 55