“Purdue CNIT 155 Final Exam Mega Prep Pack: 140 Practice Questions with Answers + Study Guides, 4 Quizlets & 7-Day Study Planner

Purdue CNIT 155 Final Exam Mega Prep Pack: 140
Practice Questions with Answers + Study Guides, 4
Quizlets & 7-Day Study Planner




Purdue CNIT 155 Final Exam Study Guide (2025
Edition)
Course Focus: Introduction to Object-Oriented Programming with Java
Exam Format: Multiple Choice, Coding Output Analysis, and Short Programming Tasks




Core Topics to Study
1. Java Basics

• Syntax, structure of a Java program
• Data types (int, double, char, boolean, String)
• Variable declaration and initialization
• Comments: // (single-line), /* */ (multi-line)

Example:

java
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int age = 20;
double gpa = 3.75;
String name = "Boilermaker";



2. Control Structures

• if, else if, else statements
• switch statements
• Logical operators: &&, ||, !

,Example:

java
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if (score >= 90) {
System.out.println("A");
} else if (score >= 80) {
System.out.println("B");
}



3. Loops

• for, while, and do-while loops
• Nested loops
• Loop control: break, continue

Example:

java
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for (int i = 0; i < 10; i++) {
System.out.println(i);
}



4. Arrays

• One-dimensional and two-dimensional arrays
• Array declaration, initialization, traversal

Example:

java
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int[] nums = {1, 2, 3};
System.out.println(nums[0]); // Output: 1



5. Methods (Functions)

• Method definition and calling
• Parameters, return values
• Method overloading

Example:

java
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public static int add(int a, int b) {
return a + b;
}



6. Classes & Objects

• Class structure: fields, constructors, methods

, • Creating objects
• this keyword
• Access modifiers: public, private, protected

Example:

java
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public class Dog {
String name;
public Dog(String n) {
name = n;
}
}



7. Inheritance

• extends keyword
• super keyword
• Method overriding
• @Override annotation

Example:

java
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class Animal {
void makeSound() {
System.out.println("Sound");
}
}

class Dog extends Animal {
@Override
void makeSound() {
System.out.println("Bark");
}
}



8. Exception Handling

• Try/catch blocks
• finally clause
• Common exceptions: ArithmeticException, NullPointerException

Example:

java
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try {
int result = ;
} catch (ArithmeticException e) {
System.out.println("Cannot divide by zero!");
}



9. File I/O Basics (if covered)

, • Using Scanner and File classes
• Reading from text files




Practice Questions
1. What’s the output of this code?

java
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int x = 5;
while (x < 8) {
System.out.print(x);
x++;
}

2. Fix the error:

java
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public void printHello()
System.out.println("Hello");

3. Write a method that returns the sum of elements in an array.




Tips for the Final Exam
• Memorize syntax patterns (especially loops and conditionals).
• Practice tracing code for output.
• Know how to debug common errors (null pointers, out-of-bounds, etc.).
• Review past assignments and labs – many questions are similar!




Purdue CNIT 155 Final Exam Study Planner (7-
Day Plan)
Goal: Build confidence with Java programming concepts, reinforce logic building, and be ready for any question type.




Daily Planner Overview
Day Focus Areas Tasks
- Review Java syntax, data types, and variable rules
Day 1 Java Basics + Variables - Watch 30-min YouTube crash course
- Practice 10 variable declaration examples