Java SE 8 Programmer II Practice Questions - Oracle Certified Professional, Java SE 8 Programmer II (Exam 1Z0-809) Exam

Which set of characteristics correctly describes a properly implemented immutable class in Java?

Fields are private and non-final; setters return defensive copies The class is final, all fields are private and final, no setters exist, and mutable fields are defensively copied in the constructor and getters All fields are public final so they cannot be reassigned by callers The class implements Cloneable and overrides clone() to return shallow copies

Correct Answer:

The class is final, all fields are private and final, no setters exist, and mutable fields are defensively copied in the constructor and getters

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