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See this thread and this one for details.
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immutable

 
eswar kumar
Ranch Hand
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what is immutable? what are the other immutable objects available in Java except string?
 
Ernest Friedman-Hill
author and iconoclast
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An immutable object is one whose state cannot change; it represents a constant of some kind. java.lang.Integer, Long, Short, Character, Byte, Float, and Double are some of the other immutable classes in the JDK. There are others, and of course anyone can write an immutable class.
 
Zeeman Chen
Greenhorn
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check this out
http://mindprod.com/jgloss/immutable.html
 
David O'Meara
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... or this...
 
Steve Roderick
Greenhorn
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My mate went for a job interview in java and they asked him how "they could change a string by passing it into a method". ANSWER they can't, or use a StringBuffer
[ November 27, 2003: Message edited by: Steve Roderick ]
 
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