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Immutable class - equals() and hashCode() methods ?

 
Ranch Hand
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Whether Immutable class need to implement equals() and hashCode() methods ?
 
Rancher
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Yes.

Usually.
 
Java Cowboy
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Whether you need to implement hashCode() and equals() is a separate issue from whether your class is immutable or not.

It's often a good idea to implement hashCode() and equals(), but it's not absolutely required for immutable classes.
 
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