Constructors

Appeared in 10 of the 11 available papers.

Examined in

10 of 11 papers

Appears almost every year — treat as core

Typically worth

6.5 marks

Average per paper it appears in · 65 marks in total

Usual form

MCQ

27% of this chapter's 15 questions

Needs a diagram

13%

2 questions carry a figure — practise drawing them

Question-type distribution

MCQ4
Short answer3
Program3
Output2
Definition2
Difference1

Most frequent topics

Constructor overloading 4Class with default constructor and discount slabs 2Creating an object with a parameterised constructor 1Default and parameterised constructors 1Naming a constructor 1Objects and constructors 1Default constructor 1Class with default constructor and slab billing 1

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Print chapter question bank

Showing 15 of 15 matching questions (65 marks).

15 questions

1

Choose the correct answers to the questions from the given options. (Do not copy the questions, write only the correct answers.)

1(xx)2026

MCQEasy1 mark

In constructor overloading all constructors should have the same name as of the class but with a different set of __________.

(a)Access specifiers
(b)Classes
(c)Return type
(d)Parameters

2(iii)2025

Short answerEasy2 marks

Write the Java statement for creating an object named 'sifra' of the class 'Robot', which takes three double parameters.

2(v)2025

OutputModerate2 marks

Consider and give the output of the following program: class report { int a, b; report() { a = 10; b = 15; } report(int x, int y) { a = x; b = y; } void print() { System.out.println(a * b); } static void main() { report r = new report(); r.print(); report p = new report(4, 5); p.print(); } }

1

Choose the correct answers to the questions from the given options. (Do not copy the questions, write only the correct answers.)

1(xv)2024

MCQEasy1 mark

If the name of the class is "Yellow", what can be the possible name for its constructors?

(a)yellow
(b)YELLOW
(c)Yell
(d)Yellow

2(ix)2024

OutputModerate2 marks

Consider the given program and answer the questions given below: class temp { int a; temp() { a = 10; } temp(int z) { a = z; } void print() { System.out.println(a); } void main() { temp t = new temp(); temp x = new temp(30); t.print(); x.print(); } } (a) What concept of OOPs is depicted in the above program with two constructors? (b) What is the output of the method main()?

2(ix)2023

Short answerEasy2 marks

Name the following: (a) What is an instance of the class called? (b) The method which has the same name as that of the class name.

3

Name the following:

3(i)2021

MCQEasy1 mark

The concept of having more than one constructor with different types of parameters:

(a)Copy constructor
(b)Method overloading
(c)Constructor overloading
(d)Overloaded methods

4

State whether the statement is True or False:

4(iv)2021

MCQModerate1 mark

Java compiler automatically creates a default constructor in case no constructor is present in the java class.

(a)True
(b)False
(c)—
(d)—

2(c)2020

DefinitionModerate2 marks

What is constructor overloading?

ProgramHard15 marks

A private Cab service company provides service within the city at the following rates: AC CAR NON AC CAR UPTO 5 KM Rs. 150/- Rs. 120/- BEYOND 5 KM Rs. 10/- PER KM Rs. 08/- PER KM Design a class CabService with the following description: Member variables / data members: String car_type - To store the type of car (AC or NON AC) double km - To store the kilometer travelled double bill - To calculate and store the bill amount Member methods: CabService() - Default constructor to initialize data members. String data members to "" and double data members to 0.0. void accept() - To accept car_type and km (using Scanner class only). void calculate()- To calculate the bill as per the rules given above. void display() - To display the bill as per the following format: CAR TYPE: KILOMETER TRAVELLED: TOTAL BILL: Create an object of the class in the main method and invoke the member methods.

Question diagram will be added.Figure for this question

ProgramHard15 marks

Design a class ShowRoom with the following description: Instance variables / data members: String name - to store the name of the customer long mobNo - to store the mobile number of the customer double cost - to store the cost of the items purchased double dis - to store the discount amount double amount - to store the amount to be paid after discount Member methods: ShowRoom() - default constructor to initialize data members void input() - to input customer name, mobile number, cost void calculate()- to calculate discount on the cost of purchased items, based on the following criteria: Cost Discount (%) Less than or equal to Rs. 10000 5% More than 10000 and up to 20000 10% More than 20000 and up to 35000 15% More than 35000 20% void display() - to display customer name, mobile number, amount to be paid after discount Write a main() method to create an object of the class and call the above member methods.

3(d)2018

Short answerEasy2 marks

Write two characteristics of a constructor.

3(e)2017

DifferenceModerate2 marks

Differentiate between constructor and function.

3(c)2016

DefinitionModerate2 marks

What is a parameterized constructor?

Figure for this question

ProgramHard15 marks

Define a class named BookFair with the following description: Instance variables / data members: String bName - stores the name of the book double price - stores the price of the book Member functions: BookFair() - default constructor to initialize data members void input() - to input and store the name and the price of the book void calculate()- to calculate the price after discount. Discount is calculated based on the following criteria: Price Discount Less than or equal to Rs. 1000 2% of price More than 1000 and up to Rs. 3000 10% of price More than Rs. 3000 15% of price void display() - to display the name and price of the book after discount Write a main() method to create an object of the class and call the above methods.