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

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Given a thread-safe singleton implemented with an enum: public enum Config { INSTANCE; private int v = 1; } Which statement about this pattern is TRUE?

It is not thread-safe because enum constants are initialized lazily on each access It requires an explicit synchronized getInstance() method to be safe It provides serialization safety and guards against reflection-based instantiation automatically It cannot hold mutable instance fields like v

Correct Answer:

It provides serialization safety and guards against reflection-based instantiation automatically

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