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    Design Patterns:

            Design Patterns are the best rules and they are developed and proved by industry   

       experts and release to the industry for elimination the side effects which are recurring  

      occurrence in software development.

           Originally design patterns are not concept of java. But all the design patterns are 

      implemented effectively in java programming.

     In the industry day by day, we come across so many number of design patterns which are  

    developed and released by industry experts.

      These design patterns are widely used in JSE and JEE applications in the real world. 

   As a part of JSE we have two types of design patterns they are.

         1)   FactoryMethod.

         2)   SingletonClass.

    In real world projects of java the developers will apply design patterns for eliminating 

  the side effects and making the project as maintain free.