What are the differences between these two declarations?

Question

List<Integer> L = new ArrayList<>();

ArrayList<Integer> AL = new ArrayList<>();

In what way they are different
OR
are they same?

Answer 1

I agree with your answer, but as I saw in many collections tutorials they use the List instead of ArrayList as a reference object thats why it bothered me ask this question.
Thanks for the answer

Answer 2

https://stackoverflow.com/questions/147468/why-should-the-interface-for-a-java-class-be-preferred

Look for the suggested answer in the above link, I found this as much more detailed explanation.

Answer 3

https://www.javaworld.com/article/2073649/why-extends-is-evil.html

This blog post explains why interfaces are more important than Classes.