How to create immutable class in "Java"

Immutable objects......?

Immutable objects are instance whose state does not change after it has been initialized.
For example, one of our favourite class String is also immutable, that's why once it's instantiated its value never changed.
And all other wrapper classes(Integer, Boolean, Byte, Short) all are Immutable class.

There is some following way, by using that we can also make our own Immutable class.

  1. Declare the class as final so it can't be extended.
  2. Make all fields private so that direct access is not allowed.
  3. Don't provide setter methods for the variables.
  4. Make all Mutable fields final, so that its values can be assigned only once.
  5. Initialize all the fields via constructor performing deep copy.
  6. Performing cloning of objects in the getter methods to return a copy rather than returning the actual object reference.


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