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public class MyOuter 
{
    public static class MyInner 
    {
        public static void foo() { }
    }
}

which statement, if placed in a class other than MyOuter or MyInner, instantiates an instance of the nested class? 

  • A.MyOuter.MyInner m = new MyOuter.MyInner();
  • B.MyOuter.MyInner mi = new MyInner();
  • C.MyOuter m = new MyOuter();
    MyOuter.MyInner mi = m.new MyOuter.MyInner();
  • D.MyInner mi = new MyOuter.MyInner();

Answer: A

MyInner is a static nested class, so it must be instantiated using the fully-scoped name of MyOuter.MyInner.

Option B is incorrect because it doesn't use the enclosing name in the new.

Option C is incorrect because it uses incorrect syntax. When you instantiate a nested class by invoking new on an instance of the enclosing class, you do not use the enclosing name. The difference between Option A and C is that Option C is calling new on an instance of the enclosing class rather than just new by itself.

Option D is incorrect because it doesn't use the enclosing class name in the variable declaration.

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