Java OCA OCP Practice Question 593

Question

Which are true about a static nested class?

Choose all that apply.

  • A. You must have a reference to an instance of the enclosing class in order to instantiate it
  • B. It does not have access to nonstatic members of the enclosing class
  • C. Its variables and methods must be static
  • D. If the outer class is named MyOuter and the nested class is named MyInner, it can be instantiated using new MyOuter.MyInner();
  • E. It must extend the enclosing class 


B and D are correct.

Note

B is correct because a static nested class is not tied to an instance of the enclosing class, and thus can't access the nonstatic members of the class (just as a static method can't access nonstatic members of a class).

D uses the correct syntax for instantiating a static nested class.

A is incorrect because static nested classes do not need (and can't use) a reference to an instance of the enclosing class.

C is incorrect because static nested classes can declare and define nonstatic members.

E is wrong because it just is.

There's no rule that says an inner or nested class has to extend anything.




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