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Callers can use the {{clone()}} method to obtain an instance of such a mutable class. The {{clone()}} method must create a new instance of the {{final}} member class and copy the original state to it. The new instance is necessary because no accessible copy method may be available in the member class. If the member class evolves in the future, it is critical to include the new state in the manual copy. Finally, the {{clone()}} method must create and return a new instance of the enclosing class ({{MutableClass}}) using the newly created member instance ({{d}}) \[[SCG 2007|AA. Java References#SCG 07]\]. |
Compliant Solution (
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Copy Constructor)
This compliant solution uses a copy constructor that initializes a MutableClass instance when an argument of the same type (or subtype) is passed to it.
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