This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
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kalyan, If you were to make the constructor(s) unavailable, the class would then be un-subclassable. Instances of the class could still be obtained through some static method. A class based on the singleton pattern, might choose to make it's contructor(s) private, and then control the any instance creation of the class through a static method (often named getInstance).