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How to create immutable objects in java what is the advantage of immutable object

4,463 views · Published 4 November 2012 · 2:59 · Indexed 14 November 2026

Channel: Interview DOT · 2012 · Science & Technology

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How to create immutable objects in Java ? 
Immutable means: my public visible state cannot change after initialization.

Make the class final.
Make all members final, set them explicitly, in a static block, or in the constructor.
Make all members private.
No Methods that modify state.
Be extremely careful to limit access to mutable member components -- use Defensive Copy.

What are the advantages of immutable objects ?
One of the great advantages are that immutable objects are thread safe. Why ? Because the values will never change. They are free to be read at any time by anyone and require no synchronization.

They are great for reusable constants object.

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