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Exam (elaborations)

Intro to Java Programming – 90 Q&A on OOP, Modifiers, Interfaces – CS101 – 2025/2026

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This document offers a comprehensive set of 90 structured Java exam questions and detailed answers, specifically designed for students enrolled in Intro to Java Programming (CS101) during the 2025/2026 academic year. It is ideal for learners pursuing Computer Science, Software Engineering, and Information Technology degrees, as well as those preparing for Java certification exams or technical interviews. The content is entirely focused on object-oriented principles and core Java concepts, providing clear and complete answers for each question. Key topics include: Object-Oriented Programming (OOP): classes, objects, state, behavior, encapsulation, inheritance, interfaces Access Modifiers: private, protected, package-private, public, static, final Java Operators: arithmetic, logical, assignment, conditional (?:) Control Structures: if, switch, while, do-while, for, including infinite loop examples Primitive Data Types and Variables: local variables, instance/class variables, parameters String and Array Handling: use of String, String[], reference behavior, garbage collection Advanced Concepts: method overloading, casting with interfaces, varargs, this keyword, class design Common Java Errors: initialization mistakes, misused methods, modifiers, and interface misuse Each answer is labeled and explained in context, making this document not only a revision guide, but also a learning tool for students who need to deepen their understanding of Java mechanics. Some exercises are paired with code snippets and output explanations, helping readers connect theory to practice. This document is suitable for: First-year CS101 students Java learners at coding bootcamps Students preparing for Java midterms and finals Candidates preparing for Oracle Java certifications (e.g., OCAJP) Anyone seeking a practical and theory-rich resource for Java revision Keywords: Java Q&A, Java exam answers, Java OOP, Java modifiers, Java interface, Java encapsulation, Java inheritance, Java method, Java variable types, Java keywords, Java syntax, CS101 Java, Java control flow, Java practice exam, Java certification prep

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Uploaded on
September 29, 2025
Number of pages
20
Written in
2025/2026
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Java 2025/2026 Exam Questions and
Detailed Answers | Get it 100% Correct
Answers



What do real world objects contain? - 🧠ANSWER ✔✔state and behavior


Where is a software object's state contained? - 🧠ANSWER ✔✔fields (Java)

or variables (C++)


Where is a software object's behavior exposed? - 🧠ANSWER ✔✔methods

(Java) or functions (C++)

Hiding internal data from the outside world, and accessing it only through

publicly exposed methods is known as data... - 🧠ANSWER

✔✔encapsulation


A blueprint for a software object is called a... - 🧠ANSWER ✔✔class

,Common behavior can be defined in a ___ and inherited into a ___ using

the ___ keyword. - 🧠ANSWER ✔✔superclass, subclass, extends


A collection of methods with no implementation is called an ___. -

🧠ANSWER ✔✔interface


A namespace that organizes classes and interfaces by functionality is

called a ___. - 🧠ANSWER ✔✔package


The term API stands for ___? - 🧠ANSWER ✔✔application programmer

interface


The term "instance variable" is another name for... - 🧠ANSWER ✔✔non-

static field - instance variables are specific to an object


The term "class variable" is another name for ___. - 🧠ANSWER ✔✔static

field - class variables are fixed and global across all instances of the class

A local variable stores temporary state; it is declared inside a ___. -

🧠ANSWER ✔✔method - for example a counter in a loop int i=0;


A variable declared within the opening and closing parenthesis of a method

signature is called a ____. - 🧠ANSWER ✔✔parameter

, What are the eight primitive data types supported by the Java programming

language? - 🧠ANSWER ✔✔byte


short

long

float

double

int

char

boolean

Character strings are represented by the class ___. - 🧠ANSWER

✔✔java.lang.String


An ___ is a container object that holds a fixed number of values of a single

type. - 🧠ANSWER ✔✔array


Consider the following code snippet.




arrayOfInts[j] > arrayOfInts[j+1]



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