Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a default constructor. Which of the following is correct?
1. A a = new A();
2. A a = new B();
3. B b = new A();
4. B b = new B();

A) 1 and 2 B) 2 and 4 C) 3 and 4 D) 1 and 3 E) 2 and 3

Answer & Solution

Correct Answer: Option B

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1 Comment

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Akash Mulik 9 years ago

Option 1. & 3. is wrong because we cant create object of abstract class.
2 & 4 are correct because B is concrete class and its object is created and in Option 2, reference of class A(abstract class) can be used to hold its child class's object.

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Suppose A is an abstract class B is a concrete subclass...

Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a default constructor. Which of the following is correct? 1. A a = new A(); 2. A a = new B(); 3. B b = new A(); 4. B b = new B();

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Related Questions on Interfaces and Abstract Classes

Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a default constructor. Which of the following is correct?
1. A a = new A();
2. A a = new B();
3. B b = new A();
4. B b = new B();