Inner Classes

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 MyInner mi = new MyOuter.MyInner();

B MyOuter m = new MyOuter(); MyOuter.MyInner mi = MyOuter.MyInner();

C MyOuter.MyInner m = new MyOuter.MyInner();

D MyOuter.MyInner mi = new MyInner();

ANS:A - MyOuter.MyInner m = new MyOuter.MyInner();

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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