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.

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