Inheritance in Java

Inheritance in Java - Important Points

21.		Which keyword is used to implement method overloading in Java?

A. override

B. final

C. abstract

D. none of the above

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Answer: option d

Explanation:

The 'override' keyword is used to implement method overriding, not method overloading.

22.		Which keyword is used to prevent a class from being inherited in Java?

A. final

B. static

C. abstract

D. private

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Answer: option a

Explanation:

The 'final' keyword is used to prevent a class from being inherited in Java.

23.		What is the output of the following program? class A { int x = 10; } class B extends A { int y = 20; } class C extends B { void display() { System.out.println(x + y); } } public class Main { public static void main(String[] args) { C obj = new C(); obj.display(); } }

23.

What is the output of the following program?

class A {
int x = 10;
}
class B extends A {
int y = 20;
}
class C extends B {
void display() {
System.out.println(x + y);
}
}
public class Main {
public static void main(String[] args) {
C obj = new C();
obj.display();
}
}

A. 30

B. 20

C. 10

D. Compilation error

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Answer: option a

Explanation:

The output of the above code will be 30 as the 'display()' method in class C adds the values of 'x' and 'y'.

24.		Which of the following statements is true regarding inheritance in Java?

A. A class can inherit from multiple classes in Java.

B. A subclass can access private members of its superclass.

C. Constructors are not inherited in Java.

D. Inheritance is not supported in Java.

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Answer: option c

Explanation:

Constructors are not inherited in Java.

25.		Which keyword is used to implement an abstract method in a subclass in Java?

A. abstract

B. final

C. static

D. override

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Answer: option d

Explanation:

The 'override' keyword is used to implement an abstract method in a subclass in Java.

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