Inheritance in Java

Inheritance in Java - Important Points

31.		Which keyword is used to implement method overriding in Java?

A. override

B. final

C. abstract

D. none of the above

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Answer: option a

Explanation:

The 'override' keyword is used to implement method overriding in Java.

32.		Which of the following is not a superclass of the String class in Java?

A. Object

B. CharSequence

C. Number

D. Comparable

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Answer: option c

Explanation:

Number is not a superclass of the String class in Java.

33.		What is the purpose of the 'super' keyword in Java?

A. To call a method or constructor of a superclass

B. To declare a superclass

C. To access a private field of a superclass

D. To override a method of a superclass

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Answer: option a

Explanation:

The 'super' keyword is used to call a method or constructor of a superclass in Java.

34.		Which of the following statements is true regarding the 'this' keyword in Java?

A. It can be used to access a static field of a class.

B. It can be used to call a method of a superclass.

C. It can be used to refer to the current instance of a class.

D. It can be used to declare a constructor.

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Answer: option c

Explanation:

The 'this' keyword is used to refer to the current instance of a class in Java.

35.		What is the output of the following program? class A { void display() { System.out.println("Class A"); } } class B extends A { void display() { super.display(); System.out.println("Class B"); } } public class Main { public static void main(String[] args) { B obj = new B(); obj.display(); } }

35.

What is the output of the following program?

class A {
void display() {
System.out.println("Class A");
}
}
class B extends A {
void display() {
super.display();
System.out.println("Class B");
}
}
public class Main {
public static void main(String[] args) {
B obj = new B();
obj.display();
}
}

A. Class A, Class B

B. Class B, Class A

C. Class A

D. Class B

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Answer: option a

Explanation:

The output of the above code will be 'Class A, Class B', as the 'display()' method in class B calls the 'display()' method of class A using the 'super' keyword, followed by printing 'Class B'.

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