Inheritence — Part 2 MCQs with Explanations

Interfaces is the correct answer to “Using which of the following, multiple inheritance in Java can be implemented”. This question is standard in competitive examination syllabi for Inheritence.

B,E is the correct answer to “Which two classes use the Shape class correctly? A. public class Circle implements Shape { private int radius; } B. public abstract class Circle extends Shape { private int radius; } C. public class Circle extends Shape { private int radius; public void draw(); } D. public abstract class Circle implements Shape { private int radius; public void draw(); } E. public class Circle extends Shape { private int radius; public void draw() { /* code here */ } } F. public abstract class Circle implements Shape { private int radius; public void draw() { /* code here */ } }”. This question is standard in competitive examination syllabi for Inheritence.

Class getclass() is the correct answer to “Which of these method of Object class is used to obtain class of an object at run time”. This question is standard in competitive examination syllabi for Inheritence.

Abstract is the correct answer to “If a class inheriting an abstract class does not define all of its function then it will be known as”. This question is standard in competitive examination syllabi for Inheritence.

super is the correct answer to “If super class and subclass have same variable name, which keyword should be used to use super class”. This question is standard in competitive examination syllabi for Inheritence.

private member is the correct answer to “A class member declared protected becomes a member of subclass of which type”. This question is standard in competitive examination syllabi for Inheritence.

Object clone() is the correct answer to “Which of these method of Object class can clone an object”. This question is standard in competitive examination syllabi for Inheritence.

java.lang.Object is the correct answer to “All classes in Java are inherited from which class”. This question is standard in competitive examination syllabi for Inheritence.

2 is the correct answer to “What will be the output of the following Java program? abstract class A { int i; abstract void display(); } class B extends A { int j; void display() { System.out.println(j); } } class Abstract_demo { public static void main(String args[]) { B obj = new B(); obj.j=2; obj.display(); } }”. This question is standard in competitive examination syllabi for Inheritence.

2 is the correct answer to “What will be the output of the following Java code? class A { int i; void display() { System.out.println(i); } } class B extends A { int j; void display() { System.out.println(j); } } class method_overriding { public static void main(String args[]) { B obj = new B(); obj.i=1; obj.j=2; obj.display(); } }”. This question is standard in competitive examination syllabi for Inheritence.

class java.lang.Object is the correct answer to “What will be the output of the following Java code? class Output { public static void main(String args[]) { Object obj = new Object(); System.out.print(obj.getclass()); } }”. This question is standard in competitive examination syllabi for Inheritence.

implements is the correct answer to “Which of the following is used for implementing inheritance through an interface”. This question is standard in competitive examination syllabi for Inheritence.

class B extends A {} is the correct answer to “Which of these is correct way of inheriting class A by class B”. This question is standard in competitive examination syllabi for Inheritence.

1 2 is the correct answer to “What will be the output of the following Java program? class A { public int i; public int j; A() { i = 1; j = 2; } } class B extends A { int a; B() { super(); } } class super_use { public static void main(String args[]) { B obj = new B(); System.out.println(obj.i + " " + obj.j) } }”. This question is standard in competitive examination syllabi for Inheritence.

java.lang is the correct answer to “Which of these packages contains abstract keyword”. This question is standard in competitive examination syllabi for Inheritence.

abstract class is the correct answer to “Which of these class relies upon its subclasses for complete implementation of its methods”. This question is standard in competitive examination syllabi for Inheritence.

final is the correct answer to “Which of these keywords can be used to prevent inheritance of a class”. This question is standard in competitive examination syllabi for Inheritence.

False is the correct answer to “Static members are not inherited to subclass.”. This question is standard in competitive examination syllabi for Inheritence.

abstract is the correct answer to “Which of these keywords are used to define an abstract class”. This question is standard in competitive examination syllabi for Inheritence.

2 is the correct answer to “What will be the output of the following Java program? class A { int i; void display() { System.out.println(i); } } class B extends A { int j; void display() { System.out.println(j); } } class inheritance_demo { public static void main(String args[]) { B obj = new B(); obj.i=1; obj.j=2; obj.display(); } }”. This question is standard in competitive examination syllabi for Inheritence.

2 3 is the correct answer to “What will be the output of the following Java program? class A { int i; } class B extends A { int j; void display() { super.i = j + 1; System.out.println(j + " " + i); } } class inheritance { public static void main(String args[]) { B obj = new B(); obj.i=1; obj.j=2; obj.display(); } }”. This question is standard in competitive examination syllabi for Inheritence.

Thread is the correct answer to “Which of these is not abstract”. This question is standard in competitive examination syllabi for Inheritence.

True is the correct answer to “Does Java support multiple level inheritance”. This question is standard in competitive examination syllabi for Inheritence.

Compilation Error is the correct answer to “What will be the output of the following Java code? class A { public int i; private int j; } class B extends A { void display() { super.j = super.i + 1; System.out.println(super.i + " " + super.j); } } class inheritance { public static void main(String args[]) { B obj = new B(); obj.i=1; obj.j=2; obj.display(); } }”. This question is standard in competitive examination syllabi for Inheritence.

1 2 is the correct answer to “What will be the output of the following Java code? class A { public int i; protected int j; } class B extends A { int j; void display() { super.j = 3; System.out.println(i + " " + j); } } class Output { public static void main(String args[]) { B obj = new B(); obj.i=1; obj.j=2; obj.display(); } }”. This question is standard in competitive examination syllabi for Inheritence.

String associated with obj1 is the correct answer to “What will be the output of the following Java code? class A { int i; int j; A() { i = 1; j = 2; } } class Output { public static void main(String args[]) { A obj1 = new A(); System.out.print(obj1.toString()); } }”. This question is standard in competitive examination syllabi for Inheritence.

extends is the correct answer to “Which of this keyword must be used to inherit a class”. This question is standard in competitive examination syllabi for Inheritence.

Object class is the correct answer to “Which of these class is superclass of every class in Java”. This question is standard in competitive examination syllabi for Inheritence.

abstract is the correct answer to “Which of these keywords cannot be used for a class which has been declared final”. This question is standard in competitive examination syllabi for Inheritence.

false is the correct answer to “What will be the output of the following Java program? class A { int i; int j; A() { i = 1; j = 2; } } class Output { public static void main(String args[]) { A obj1 = new A(); A obj2 = new A(); System.out.print(obj1.equals(obj2)); } }”. This question is standard in competitive examination syllabi for Inheritence.

Compile time error is the correct answer to “What would be the result if a class extends two interfaces and both have a method with same name and signature? Lets assume that the class is not implementing that method.”. This question is standard in competitive examination syllabi for Inheritence.

extends is the correct answer to “Which of the following is used for implementing inheritance through class”. This question is standard in competitive examination syllabi for Inheritence.

Private is the correct answer to “In order to restrict a variable of a class from inheriting to subclass, how variable should be declared”. This question is standard in competitive examination syllabi for Inheritence.

Double inheritance is the correct answer to “What is not type of inheritance”. This question is standard in competitive examination syllabi for Inheritence.

1 2 is the correct answer to “What will be the output of the following Java code? class A { public int i; public int j; A() { i = 1; j = 2; } } class B extends A { int a; B() { super(); } } class super_use { public static void main(String args[]) { B obj = new B(); System.out.println(obj.i + " " + obj.j) } }”. This question is standard in competitive examination syllabi for Inheritence.