Tutorial :constructors in java [duplicate]


Possible Duplicates:
Why do we need a private constructor?
Can a constructor in Java be private?

whts the use of private constructor in java?


One more thing you can achive is SingleTon pattern with the help of the private constructor.

Some thing like this:

public class ClassicSingleton {     private static ClassicSingleton instance = null;     private ClassicSingleton() {        // Exists only to defeat instantiation.     }     public static ClassicSingleton getInstance() {        if(instance == null) {           instance = new ClassicSingleton();        }        return instance;     }  }  


A private constructor allows the developer of a class to better control how this class can be instantiated, e.g. not at all (for a utility class), only internally (for a singleton) or only through factory methods.

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