TopicTestInheritance

 

Java Test Paper

                  • Variables, Loops,
                  • Conditional Statements,
                  • Access Modifiers,
                  • and Inheritance

Section A: Multiple Choice (1 mark each)

  1. What is the correct way to declare an integer variable in Java? a. int x = 5; b. integer x = 5; c. var x = 5; d. x = 5;

  2. Which of the following loops is suitable when the number of iterations is known in advance? a. for loop b. while loop c. do-while loop d. switch loop

  3. In Java, what does the break statement do? a. Terminates the program. b. Exits the loop or switch statement. c. Skips the current iteration of a loop. d. Skips the next iteration of a loop.

  4. Which access modifier restricts a class member's visibility to only the class in which it is declared? a. public b. protected c. private d. package-private (default)

  5. In Java, what is inheritance? a. A mechanism for accessing class members from other classes. b. A way to create objects. c. A process where a subclass inherits the properties and behaviors of a superclass. d. A method for defining variables.

Section B: True/False (1 mark each)

  1. True or False: Variables declared inside a block of code are only accessible within that block.
  2. True or False: The do-while loop always executes its code block at least once.
  3. True or False: The else if block in an if statement is mandatory.
  4. True or False: The default access modifier allows access to a class member only within the same class and package.
  5. True or False: Inheritance in Java allows a subclass to inherit members with private access from its superclass.

Section C: Code-related Questions (2 marks each)

  1. Write a Java code snippet that declares a variable count and initializes it to 0. Then, use a for loop to print the numbers from 1 to 5.

  2. Create a class named "Vehicle" with a protected member variable "speed." Then, create a subclass named "Car" that inherits from "Vehicle" and provides a method named "getSpeed" to access and return the "speed" value.

  3. Write a Java code snippet that takes an integer input from the user and prints "Even" if the number is even and "Odd" if the number is odd.

  4. Create a class named "Person" with private member variables for "name" and "age." Then, create a subclass named "Employee" that inherits from "Person" and provides methods to set and retrieve these attributes.

  5. Write a Java code snippet that calculates and prints the sum of all even numbers from 1 to 50 using a for loop.

  6. Create a class hierarchy for shapes, starting with a base class "Shape." Define subclasses like "Circle," "Rectangle," and "Triangle," and provide methods to calculate the area of each shape.

  7. Write a Java program that uses a for loop to print the Fibonacci series up to the 10th term.

Section D: Bonus (3 marks)

  1. Explain the differences between the public, protected, private, and package-private (default) access modifiers in Java. Provide examples to illustrate these differences.

  2. Extend the shape hierarchy from question 16 by adding an "EquilateralTriangle" subclass. Provide an implementation for calculating its area.

Comments

Post a Comment

Popular posts from this blog

FrontEnd - FAQs - Part 1

  Front End FAQS – Part 1                                                                                                          HTML 1.         What is HTML? Answer : HTML (Hypertext Markup Language) is a markup language used to create and structure content for the web. HTML code consists of a series of tags that define different elements, such as headings, paragraphs, images, links, and more. HTML is the backbone of the web and is used...
Read more

Java Script - FAQs

Java Script FAQs   1.        What is JavaScript, and what are its features? Answer : JavaScript is a high-level, dynamic programming language that is primarily used for creating interactive web applications. It was first created in 1995 by Brendan Eich and has since become one of the most widely used programming languages in the world. Some of the features of JavaScript include: ·          Object-oriented programming: JavaScript is a highly object-oriented language and supports many of the features that are found in other object-oriented languages like Java and C++. This allows developers to create complex applications with a high degree of abstraction and modularity. ·          Dynamic typing: JavaScript is a dynamically typed language, which means that variables do not need to be declared with a specific data type before they are used. This makes it much easier for develo...
Read more

CoreJava - ClassesObjectsMethods - Assignment

Image
  CoreJava - ClassesObjectsMethods - Assignment Classes, Objects, Methods: 1.        Create a class called "Person" with instance variables for name, age, and gender. 2.        Create an object of the "Person" class and set its instance variables. 3.        Write a method in the "Person" class that prints out the person's name, age, and gender. 4.        Write a method that calculates the age of a person based on their birth year. 5.        Write a method that checks if a person is an adult (over 18 years old). 6.        Create a class called "Rectangle" with instance variables for length and width. 7.        Write a method in the "Rectangle" class that calculates the area of the rectangle. 8.        Write a method that calculates the perimet...
Read more