This is a custom threadpool.

For more on threadpool you can visit these pages.

1. Wiki
2. GeeksforGeeks

Explaination of code.

• The main class creates 4 sample task.
• The sample task sleeps for 2 secs and prints the task number.
• The SIZE reffers to the no. of threads in the threadpool.
• MyThreadPool is the implementation of my custom threadpool.