0

When I create a single ArrayList, I create it as follows

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

When I create an array of ArrayList, I create it as follows

ArrayList<Integer>[] aal = new ArrayList[10];

My question is, why can't we specify the generics while creating an array, just like we do when creating an ArrayList. Why doesn't the following work to create an array of ArrayList

ArrayList<Integer>[] aal = new ArrayList<>()[10];
Improve this question
3
  • 2
    Array is structure which should guarantee type of its elements. Generics break that guarantee because they are erased at runtime. Commented Mar 18, 2017 at 19:10
  • Official tutorial abot this subject: docs.oracle.com/javase/tutorial/java/generics/… Commented Mar 18, 2017 at 19:13
  • 1
    This has been asked before too many times to count -- in the future, please search first. The usual solution is to not try to create an array of a generic collection but rather to instead create a collection of collections, such as a List of Lists, here List<List<Integer>>. Commented Mar 18, 2017 at 19:14
Related questions
27496
Why is processing a sorted array faster than processing an unsorted array?
12225
How can I remove a specific item from an array in JavaScript?
4129
Create ArrayList from array
Load 7 more related questions Show fewer related questions

0

Reset to default

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.