Prerita Saini

Added a code of butterfly pattern with hollow space in java. - [x] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md). - [x] This pull request is all my own work -- I have...

Update Pangram.java

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Updated the Pangram.java file by adding a bitwise approach and improving code readability - [x] I have read [CONTRIBUTING.md](https://github.com/TheAlgorithms/Java/blob/master/CONTRIBUTING.md). - [x] This pull request is all my own work --...

Added Sum_Index_Value.java code

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To sum the even and odd index values separately from string in java. # Pull Request ## Related issue Fixes # ## What does this PR do? - ... ##...

Added SlidingWindow.java

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Added a code that give basic idea of Sliding Window concept in java.

Added Shopping.java (Inheritance) code

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Added simple Shopping system code by using inheritance concept in java.