Discussion :: Inner Classes
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which statement, if placed in a class other than MyOuter or MyInner, instantiates an instance of the nested class?public class MyOuter { public static class MyInner { public static void foo() { } } }
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A.
MyOuter.MyInner m = new MyOuter.MyInner();
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B.
MyOuter.MyInner mi = new MyInner();
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C.
MyOuter m = new MyOuter(); MyOuter.MyInner mi = m.new MyOuter.MyInner(); |
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D.
MyInner mi = new MyOuter.MyInner();
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Answer : Option A
Explanation :
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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