Core Java - How to make a class immutable (like String)?

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Core Java | Question 460 of 493

How to make a class immutable (like String)?

Total Answers and Comments: 5

Last Update: February 11, 2008 Asked by: sha_kr2001

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December 27, 2007 00:39:45

TarunV

Member Since: December 2007 Contribution: 1

RE: How to make a class immutable (like String)?

Use final modifier

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December 27, 2007 01:43:51

sha_kr2001

Member Since: December 2007 Contribution: 7

RE: How to make a class immutable (like String)?

Dear Mr Tarun,

I dont think that u have not understood the question.Immutable means when ever u will try to change the value of a string then a new object will be created and will point to that new object not to the original one. Using final means that u r not allowing that class to extend...

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January 11, 2008 09:24:09

satyd

Member Since: January 2008 Contribution: 3

RE: How to make a class immutable (like String)?

1.The Class should be final
2.The Properties of the class should be private and should not have any setter methods

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January 11, 2008 09:31:19

satyd

Member Since: January 2008 Contribution: 3

RE: How to make a class immutable (like String)?

More drtails will be:-
A class will be immutable if all of the following are true:

1)All of its fields are final
2)The class is declared final
3)The this reference is not allowed to escape during construction
4)Any fields that contain references to mutable objects, such as arrays, collections, or mutable classes like Date:
    -Are private
    -Are never returned or otherwise exposed to callers
    -Are the only reference to the objects that they reference
    -Do not change the state of the referenced objects after construction

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February 11, 2008 06:07:13

sampra

Member Since: February 2008 Contribution: 279

RE: How to make a class immutable (like String)?

Declare class as final

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