Calculator in Java for Unit Conversion in Hindi

How to Make a Calculator in Java for Unit Conversion Using Swing Package

1-How to make a Calculator in C#.NET Technology
https://www.youtube.com/watch?v=EjWtq...
2-Scientific Calculator in Java
https://www.youtube.com/watch?v=L-r9r...
3-How to make advanced Graphic Calculator in Java
https://www.youtube.com/watch?v=gPMeV...
4-How to Make a Graphic Calculator in Java
https://www.youtube.com/watch?v=Gkb8w...
5-How to Make a Simple Calculator in Java with Net beans IDE 
https://www.youtube.com/watch?v=EkPlb...

Note: Java Language is based on Class & Object.
4 Pillers in Java are -Encapsulation , Abstraction , Inheritance & Polymorphism