What is the diamond operator in Java? [duplicate]

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Don’t worry. It’s not an evil. It’s feature of Java 7.

The purpose of the diamond operator is to simplify instantiation of generic classes.

For example, instead of

List<Map<Integer,Set<String>>> p = new ArrayList<Map<Integer,Set<String>>>();

with the diamond operator we can write only

List<Map<Integer,Set<String>>> p = new ArrayList<>();

If you want to know more about it and want to use it, please have a quick look here and decide whether it’s useful to you or not.

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