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immutable objects....

prateek sharmaa
Ranch Hand

Joined: May 15, 2010
Posts: 38
hi all,
can anyone please tell me that what are immutable objects in Java other than the following :
(1) String
(2) Wrapper Objects

and how can we make objects immutable??
Istvan Kovacs
Ranch Hand

Joined: May 06, 2010
Posts: 100
http://java.sun.com/docs/books/tutorial/essential/concurrency/imstrat.html

(Under the hood, String isn't completely immutable, it's effectively immutable. The string's hash code is cached in an instance variable, but is not computed until it is first accessed.)
Rob Spoor
Sheriff

Joined: Oct 27, 2005
Posts: 19720
    
  20

prateek sharmaa wrote:and how can we make objects immutable??

Please SearchFirst. This question has been asked several times before.
prateek sharmaa
Ranch Hand

Joined: May 15, 2010
Posts: 38
thanks Rob and Istvan for the reply and i am really sorry for posting the question without searching.

now can you please give me the answer of my first question that whether any other objects are there other thatn Strings and Wrapper objects that are immutable??
Rob Spoor
Sheriff

Joined: Oct 27, 2005
Posts: 19720
    
  20

java.lang.Class
java.lang.Object
java.net.URI

And then I got bored

In essence, any class that does not allow its internal state (fields) to be changed is immutable. Any stateless object (like instances of java.lang.Object) are inherently immutable.
 
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