Inheritance in Java

Inheritance in Java - Important Points

26.		Which type of inheritance is used in Java for classes?

A. Single inheritance

B. Multiple inheritance

C. Hybrid inheritance

D. Hierarchical inheritance

View Answer Discuss Work Space

Answer: option a

Explanation:

Single inheritance is used in Java for classes.

27.		Which of the following is not a benefit of inheritance in Java?

A. Code reusability

B. Polymorphism

C. Encapsulation

D. Modularity

View Answer Discuss Work Space

Answer: option c

Explanation:

Encapsulation is not a benefit of inheritance in Java, as it is a separate concept.

28.		What is the access modifier of a method or field that is inherited by a subclass in Java?

A. public

B. private

C. protected

D. default

View Answer Discuss Work Space

Answer: option c

Explanation:

The access modifier of a method or field that is inherited by a subclass in Java is 'protected'.

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

29.

What is the output of the following program?

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

A. Class A

B. Class B

C. Compilation error

D. Runtime error

View Answer Discuss Work Space

Answer: option b

Explanation:

The output of the above code will be 'Class B', as the 'display()' method in class B overrides the method in class A.

30.		What is the output of the following program? class A { int x = 10; } class B extends A { int x = 20; } public class Main { public static void main(String[] args) { A obj1 = new A(); B obj2 = new B(); System.out.println(obj1.x); System.out.println(obj2.x); } }

30.

What is the output of the following program?

class A {
int x = 10;
}
class B extends A {
int x = 20;
}
public class Main {
public static void main(String[] args) {
A obj1 = new A();
B obj2 = new B();
System.out.println(obj1.x);
System.out.println(obj2.x);
}
}

A. 10, 20

B. 20, 20

C. 10, 10

D. Compilation error

View Answer Discuss Work Space

Answer: option a

Explanation:

The output of the above code will be '10, 20', as the variable 'x' in class A and class B have different values.

Worried about Placements?

Get on FAST TRACK COURSE

Inheritance in Java

Subscribe for Latest Career Trends

Use AI and ChatGPT for Career Guidance

Unlock Your Future

Worried for Placements in 2025?

Join FAST TRACK Course

Supercharge Your SUCCESS

Join All in One Placement Mock Tests-2025