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CSE 205 Final Exam 2026: 100 Practice Questions with Answers and Explanations | PDF, Exams of Computer Science

Arizona State University (ASU) - Polytechnic CampusComputer Science

CSE 205 Final Exam 2026: 100 Practice Questions with Answers and Explanations | PDF

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CSE 205 Final Exam 2026: 100 Practice Questions
with Answers and Explanations | PDF
SECTION 1 (1–50) (Java Fundamentals, Variables, Loops, Conditions, Operators)
1. What will be the value of an integer variable after assigning 15 and then
adding 10 to it?
Answer: 25
Explanation: 15 + 10 = 25 using basic arithmetic addition.
2. What data type should you use in Java for storing true or false values?
Answer: boolean
Explanation: boolean stores only two values: true or false.
3. What will happen if you divide two integers like 7 divided by 2 in Java?
Answer: 3
Explanation: Integer division removes the decimal part.
4. What is the result of 10 % 3 in Java programming?
Answer: 1
Explanation: Modulus returns the remainder after division.
5. What keyword is used in Java to declare a constant variable?
Answer: final
Explanation: final prevents value changes after assignment.
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Download CSE 205 Final Exam 2026: 100 Practice Questions with Answers and Explanations | PDF and more Exams Computer Science in PDF only on Docsity!

CSE 205 Final Exam 2026: 100 Practice Questions

with Answers and Explanations | PDF

SECTION 1 (1 – 50) (Java Fundamentals, Variables, Loops, Conditions, Operators)

  1. What will be the value of an integer variable after assigning 15 and then adding 10 to it? Answer: 25 Explanation: 15 + 10 = 25 using basic arithmetic addition.
  2. What data type should you use in Java for storing true or false values? Answer: boolean Explanation: boolean stores only two values: true or false.
  3. What will happen if you divide two integers like 7 divided by 2 in Java? Answer: 3 Explanation: Integer division removes the decimal part.
  4. What is the result of 10 % 3 in Java programming? Answer: 1 Explanation: Modulus returns the remainder after division.
  5. What keyword is used in Java to declare a constant variable? Answer: final Explanation: final prevents value changes after assignment.
  1. What will be printed if you concatenate "Hello" and 5 using + operator? Answer: Hello Explanation: String concatenation converts numbers to text.
  2. What is the default value of a boolean variable declared globally in Java? Answer: false Explanation: Instance variables default to false if not initialized.
  3. What happens when you use == between two primitive integers in Java? Answer: Value comparison Explanation: == compares actual numeric values for primitives.
  4. What will be the output of 5 + 2 * 3 in Java following operator precedence? Answer: 11 Explanation: Multiplication happens before addition.
  5. What symbol is used to write a single-line comment in Java code? Answer: // Explanation: Double slash comments out a single line.
  6. What happens if a variable is declared but not initialized inside a method? Answer: Compilation error Explanation: Local variables must be initialized before use.
  7. What is the result of comparing 10 > 5 in a Java program?
  1. What is the output of 9 / 2 in integer division? Answer: 4 Explanation: Decimal is discarded in integer division.
  2. What does the increment operator ++ do to a variable? Answer: Increases value by 1 Explanation: It adds one to the current value.
  3. What keyword is used to define a method that does not return anything? Answer: void Explanation: void means no return value.
  4. What will be printed if x = 5 and x++ is executed then printed? Answer: 5 Explanation: Post-increment uses original value first.
  5. What is the output of System.out.println(10 == 10)? Answer: true Explanation: Both values are equal.
  6. What happens when you use + between two strings in Java? Answer: Concatenation Explanation: Strings are joined together.
  7. What type of error occurs when syntax rules are broken in Java?

Answer: Compile-time error Explanation: Compiler detects incorrect syntax.

  1. What is stored in a char data type variable? Answer: Single character Explanation: Example: 'A', 'b', '#'.
  2. What is the result of !(true) in Java? Answer: false Explanation: NOT operator reverses boolean value.
  3. What is the result of 4 > 2 && 3 > 5? Answer: false Explanation: One condition is false so AND fails.
  4. What is used to store multiple values of same type in Java? Answer: Array Explanation: Arrays hold fixed-size collections.
  5. What is the index of the first element in an array? Answer: 0 Explanation: Java arrays start from index 0.
  6. What happens if you forget a semicolon in Java? Answer: Compile-time error Explanation: Java requires semicolons to end statements.

Answer: Initialize objects Explanation: Constructors set initial object values.

  1. What happens when two strings are compared using ==? Answer: Memory reference comparison Explanation: It does not compare actual text content.
  2. What is the correct way to declare an integer variable in Java? Answer: int x; Explanation: int is the keyword for integers.
  3. What is the output of 6 + 4 / 2? Answer: 8 Explanation: Division happens before addition.
  4. What does the break statement do in a loop? Answer: Exits loop immediately Explanation: Stops loop execution early.
  5. What is the purpose of the continue statement in loops? Answer: Skips current iteration Explanation: Moves to next loop cycle.
  6. What is a method in Java? Answer: A reusable block of code Explanation: Methods perform specific tasks.
  1. What happens if you assign a double value to an int variable without casting? Answer: Compilation error Explanation: Possible loss of precision.
  2. What is the output of 3 == 3.0 in Java? Answer: true Explanation: Numeric values are equal after type conversion.
  3. What is the purpose of System.out.println()? Answer: Prints output with new line Explanation: Displays data on console.
  4. What happens when you use nested loops? Answer: Loop inside another loop executes repeatedly Explanation: Inner loop runs fully for each outer loop iteration.
  5. What is the result of 12 / 5 in Java integer division? Answer: 2 Explanation: Decimal is removed.
  6. What is the main purpose of the main method in Java? Answer: Program execution entry point Explanation: Java starts running from main method.
  7. What happens when you declare an array of size 5 but try to access index 5?
  1. What will happen if you try to modify a string directly in Java? Answer: Strings are immutable Explanation: A new string is created instead.
  2. What keyword is used to define a method inside a class in Java? Answer: return type (e.g., void, int, String) Explanation: Methods must declare a return type.
  3. What is the output of a method that has no return statement but return type is void? Answer: Nothing is returned Explanation: void methods only execute actions.
  4. What is a parameter in a Java method? Answer: Input value passed into method Explanation: Parameters allow data input.
  5. What is the output of calling a method that returns 10 and printing it? Answer: 10 Explanation: Returned value is displayed.
  6. What is method overloading in Java? Answer: Same method name with different parameters Explanation: It improves code flexibility.
  1. What is the purpose of a constructor in a class? Answer: Initialize object state Explanation: Runs automatically when object is created.
  2. What happens if no constructor is defined in a class? Answer: Default constructor is provided Explanation: Java supplies a no-argument constructor.
  3. What keyword is used to create an object in Java? Answer: new Explanation: Allocates memory for object creation.
  4. What does the keyword this refer to inside a class? Answer: Current object instance Explanation: It refers to the calling object.
  5. What is inheritance in Java? Answer: One class acquiring properties of another Explanation: Promotes code reuse.
  6. What keyword is used to inherit a class in Java? Answer: extends Explanation: Used for class inheritance.
  7. What is method overriding in Java?
  1. What happens when you concatenate null with a string? Answer: "null" is treated as text Explanation: It becomes part of string.
  2. What is recursion in Java? Answer: Method calling itself Explanation: Used for repetitive problems.
  3. What is the base case in recursion? Answer: Condition that stops recursion Explanation: Prevents infinite loop.
  4. What happens if recursion has no base case? Answer: Stack overflow error Explanation: Infinite method calls occur.
  5. What is the output of System.out.println(2 + 3 + "4")? Answer: 54 Explanation: Left-to-right evaluation (5 then string concat).
  6. What is the output of System.out.println("2" + 3 + 4)? Answer: 234 Explanation: Everything becomes string after first concatenation.
  7. What is the difference between while and do-while loop?

Answer: do-while executes at least once Explanation: Condition checked after execution.

  1. What is the output of a loop that runs from 1 to 5 inclusive printing each number? Answer: 1 2 3 4 5 Explanation: Each iteration prints incremented value.
  2. What is a nested loop? Answer: Loop inside another loop Explanation: Used for matrix/grid problems.
  3. What is the time complexity of a single loop from 1 to n? Answer: O(n) Explanation: Executes n times linearly.
  4. What is the time complexity of nested loops each running n times? Answer: O(n²) Explanation: Multiplication of iterations.
  5. What is the output of comparing two identical string literals using ==? Answer: May return true (string pool optimization) Explanation: Same reference in string pool.
  6. What is the safest way to compare string values in Java? Answer: equals() method Explanation: Compares actual content.

Answer: Automatic memory cleanup of unused objects Explanation: JVM frees memory.

  1. What is the role of JVM in Java? Answer: Runs Java bytecode Explanation: Enables platform independence.
  2. What is bytecode in Java? Answer: Intermediate compiled code for JVM Explanation: Not machine-specific.
  3. What is compilation in Java? Answer: Converting source code to bytecode Explanation: Done by javac compiler.
  4. What is the main advantage of Java being platform independent? Answer: Write once, run anywhere Explanation: Bytecode runs on any JVM.