HowToDoInJava

Java Diamond Operator – Improved Type Inference

by

Before java 7, while using generics you had to supply type parameters to variables types and to their actual types. Now, it has been relieved a bit in this new java 7 feature, and a blank diamond on right side of declaration will work fine.

Compiler is smart enough in java 7 to identify that blank diamond infer to type defined on left hand side of declaration.

public class ElvisOperatorTest {
    public static void main(String[] args) {
        @SuppressWarnings("unused")
        Map<string , Integer> params = new HashMap<>();
    }
}

Happy Leaning !!

Feedback, Discussion and Comments

  1. Thanks

    Reply

Ask Questions & Share Feedback

Your email address will not be published. Required fields are marked *

*Want to Post Code Snippets or XML content? Please use [java] ... [/java] tags otherwise code may not appear partially or even fully. e.g.
[java] 
public static void main (String[] args) {
...
} 
[/java]

Help me fight spammers. Solve this simple math. *