Multiple Choice Question

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Submitted by heartin on Mon, 10/05/2015 - 07:44

QID:

Type:

Multiple Choice Question

Category:

Java Programmer I

Tags:

inheritance

overriding

abstract classes

Validated against:

java8

Question:

Given:

interface I {
}

class A implements I {
	
	public void m(){
		
	}
}

abstract class B extends A { //line 1

	public abstract void m(); //line 2
}

class C extends B { //line 3
	
}

Select 1 option

A. Class will compile successfully

B. Compilation will fail at line marked as line 1.

C. Compilation will fail at line marked as line 2.

D. Compilation will fail at line marked as line 3.

Reference:

http://javajee.com/rules-for-overriding

Answer and Explanation (Click to expand)

Answer:

Explanation:

B and C are incorrect, as you can make a non-abstract method as abstract in child class while overriding; however child class should also be declared as abstract.

D is correct, as the compilation error happens in the line marked as line 3, as the method m() is now abstract in its parent and hence D should either implement that method or declare itself as abstract.

Q&A Set:

Set X

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