
Java Class and Object Quiz
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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Which of the following best describes a class in Java?
A runtime entity
A blueprint for objects
An instance of an object
A collection of libraries
Answer explanation
Answer: B – a blueprint for objects
Explanation: A class acts as a template that defines variables and methods used to create objects.
2.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
What is an object in Java?
A compiled file
A set of instructions
An instance of a class
A variable
Answer explanation
Answer: C – an instance of a class
Explanation: Objects are specific instances created using a class, representing real-world entities.
3.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
What keyword is used to create an object in Java?
this
new
object
create
Answer explanation
Answer: B – new
Explanation: The new keyword allocates memory and creates a new object of a class.
4.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Which of the following is NOT a benefit of using classes and objects?
Encourages code reuse
Promotes modularity
Forces linear programming
Simplifies maintenance
Answer explanation
Answer: C – Forces linear programming
Explanation: OOP supports modular and scalable programming, not linear procedural code.
5.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Which of the following is a correct example of a class structure in Java?
class A { void A(); }
public static class A() {}
class A { int x; void show() {} }
object A {}
Answer explanation
Answer: C – class A { int x; void show() {} }
Explanation: This defines a class with a variable and method — the correct structure in Java.
6.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
What happens to instance variables when multiple objects are created from the same class?
Shared among all objects
Exist only in main()
Each object gets its own copy
Stored in static memory
Answer explanation
Answer: C – Each object gets its own copy
Explanation: Instance variables are unique for every object created from the class.
7.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Given the class Student, how do you create an object of it?
Student();
Student obj = new Student();
object Student = new();
new Student();
Answer explanation
Answer: B – Student obj = new Student();
Explanation: This is the correct syntax using the new keyword to instantiate an object.
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