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Private Constructors in j2se
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Pandu Rangam
Greenhorn
Joined: Dec 08, 2006
Posts: 24
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Can any one tell is there any class with a private constructor in j2se api other than Math class?
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SCJP 1.4,<br />SCWCD 1.4
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Ernest Friedman-Hill
author and iconoclast
Marshal
Joined: Jul 08, 2003
Posts: 24057
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Sure, lots. java.lang.System and java.util.Arrays are the first two that come to mind.
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[Jess in Action][AskingGoodQuestions]
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Pandu Rangam
Greenhorn
Joined: Dec 08, 2006
Posts: 24
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if the constructor is private, then is it a singleton. I mean Math,Runtime, System etc are following Singleton design pattern?
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Peter Chase
Ranch Hand
Joined: Oct 30, 2001
Posts: 1970
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Originally posted by Pandu Rangam:
if the constructor is private, then is it a singleton. I mean Math,Runtime, System etc are following Singleton design pattern?
No. Singleton implies private constructor, but private constructor does not imply Singleton.
A private constructor may be used to help to forbid any instantiation of a utility class. It may also be used for instantiable classes whose public construction interface is a factory method, rather than a constructor. Type-safe enums, pre Java 5, are another use. There are probably more.
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Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.<br /> <br />#:^P
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subject: Private Constructors in j2se
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