The design of Singleton class should ensure the following 1. the class is instantiated only once and further requests to the class to create instance are forced to return a reference to the existing one and only object. 2. the instantiation of the class can be delayed until it is actually needed ( lazy instantiation). More on singleton patternSingle Pattern in java tutorial<http://www.techlabs4u.com/2012/02/singleton-pattern-in-java-tutorial-use.html>
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