This document contains 50+ expertly answered questions on Classes and Objects from the Intro to Java Programming (CS101) course, tailored for the 2025/2026 academic year. It is specifically developed for first-year students in Computer Science, Software Engineering, and IT fields. Whether you’re reviewing for exams, quizzes, or assignments, this pack offers clear, structured insight into the foundational principles of object-oriented programming (OOP) in Java.
All questions are paired with accurate and concise answers and reflect real classroom or exam scenarios. The document is also suitable for self-learners or Java beginners needing to understand the core logic of Java objects and memory management.
Core topics covered include:
State vs. Behavior of Objects
Instance Variables and Instance Methods
Constructors: Purpose, Declaration, and Use
Access Modifiers: public, private
Object Instantiation using new
Calling Instance Methods
Parameters and Arguments
Reference Variables and Object Memory
Null References and Garbage Collection
Accessors (Getters) and Mutators (Setters)
Object Immutability
Common Methods like toString()
String Operations: Concatenation and Trimming
Object Cloning and State Copying
The content is ideal for:
University students enrolled in CS101 or OOP fundamentals
Java beginners learning to define and use classes effectively
Coding bootcamp students reinforcing their OOP basics
OCAJP certification candidates
Tutors preparing Java class/object-related quizzes
This collection gives students a strong conceptual foundation in Java’s class-based structure, promoting both academic success and industry readiness in object-oriented design.
Keywords:
Java classes, Java objects, Java OOP, Java constructors, instance variables, instance methods, access modifiers, Java reference variables, Java garbage collection, Java getters, Java setters, object instantiation, CS101 Java, Java toString, Java string methods
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Java Classes and Objects 2025/2026
Exam Questions and Verified Answers |
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Objects have two properties. One is state. What is the other? - 🧠ANSWER
✔✔Behavior
The state of an object is stored in _____ _____ - 🧠ANSWER ✔✔Instance
variables
The behavior of an object is represented by ______ ______ - 🧠ANSWER
✔✔Instance methods
The job of a _____ is to initialize instance variables at the time an object is
created. - 🧠ANSWER ✔✔Constructor
Nested inside a class declaration are three kinds of declarations. What are
they? - 🧠ANSWER ✔✔Constructor declarations
