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New language features in java7

new features :

* Language support for collections
* Automatic Resource Management
* Improved Type Inference for Generic Instance Creation (diamond)
* Underscores in numeric literals
* Strings in switch
* Binary literals
* Simplified Varargs Method Invocation

Refer:- http://code.joejag.com/2009/new-language-features-in-java-7/
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