0722~ thread pool extension

Seven parameters of thread ( a key ):

1. Number of core threads ;

2. Maximum number of threads ;

3. Survival time ;

4. Unit of time to live ;

5. Set thread queue ;

6. Set the thread factory ;

7. Set rejection policy ;

Four common thread pools :

Cache thread pool ( The fastest ):newCachedThreadPool;

Single thread pool ( The slowest ):newSingleThreadExecutor;

Fixed thread pool ( Xiaokuai ):newFixedThreadPool;

These three thread pools are generally not used in projects , All use custom thread pools ;

 

  pluses : Submission priority and execution priority ;

  Submit priority : The core --> queue --> Non core

  Execution priority : The core --> Non core --> queue