What is the Difference between ArrayBlockingQueue and LinkedBlockingQueue

Question

1. What scenarios is it better to use an ArrayBlockingQueue and when is it better to use a LinkedBlockingQueue?
2. If LinkedBlockingQueue default capacity is equal to M

Answer 1

ArrayBlockingQueue is backed by an array that size will never change after creation. Setting the capacity to Integer.MAX_VALUE would create a big array with high costs in space. ArrayBlockingQueue is always bounded.

LinkedBlockingQueue creates nodes dynamically until the capacity is reached. This is by default Integer.MAX_VALUE. Using such a big capacity has no extra costs in space. LinkedBlockingQueue is optionally bounded.