#Java Basics # Four Rejection strategies for thread pools

AbortPolicy

• The queue is full, throw an exception RejectedExecutionException

DiscardPolicy

• If the queue is full, discard it without throwing an exception

DiscardOldestPolicy

• Discard the longest surviving task in the queue to make room for new tasks

CallerRunsPolicy

• Back to where it came from, which is to hand the task back to the thread that submitted it
  • If the main thread submits a thread, if the queue in the thread pool is full, main will perform the task