Explore topic-wise MCQs in Inner Classes General Questions.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Inner Classes General Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

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();
D. MyOuter.MyInner mi = m.new MyOuter.MyInner();
E. MyInner mi = new MyOuter.MyInner();
Answer» B. MyOuter.MyInner mi = new MyInner();
Discussion
2.

class Foo { class Bar{ } } class Test { public static void main (String [] args) { Foo f = new Foo(); /* Line 10: Missing statement ? */ } } which statement, inserted at line 10, creates an instance of Bar?

A. Foo.Bar b = new Foo.Bar();
B. Foo.Bar b = f.new Bar();
C. Bar b = new f.Bar();
D. Bar b = f.new Bar();
Answer» C. Bar b = new f.Bar();
Discussion
3.

Which statement is true about a static nested class?

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. It's variables and methods must be static.
D. It must extend the enclosing class.
Answer» C. It's variables and methods must be static.
Discussion
4.

class Boo { Boo(String s) { } Boo() { } } class Bar extends Boo { Bar() { } Bar(String s) {super(s);} void zoo() { // insert code here } } which one create an anonymous inner class from within class Bar?

A. Boo f = new Boo(24) { };
B. Boo f = new Bar() { };
C. Bar f = new Boo(String s) { };
D. Boo f = new Boo.Bar(String s) { };
Answer» C. Bar f = new Boo(String s) { };
Discussion