Which ThreadPool in Java should I use?

Question

There are a huge amount of tasks. Each task is belong to a single group. The requirement is each group of tasks should executed serially just like executed in a single thread an

Answer 1

I would suggest to use task queues:

• For every group of tasks You have create a queue and insert all tasks from that group into it.
• Now all Your queues can be executed in parallel while the tasks inside one queue are executed serially.

A quick google search suggests that the java api has no task / thread queues by itself. However there are many tutorials available on coding one. Everyone feel free to list good tutorials / implementations if You know some: