Java Programming Quiz

What is the role of the JVM in the Java program execution process?

• It compiles Java source code directly into machine code.

• It interprets and executes Java bytecode on any platform.

• It only optimizes the code for better performance but doesn’t execute it.

• It is responsible for managing the file system on the host machine.

Which of the following statements about Java variables is TRUE?

• Java variable names can start with a digit.

• Java variable names are not case-sensitive.

• Java variable names can start with an underscore or a letter.

• Java variable names can include spaces.

Given the expression: int result = 5 + 2.5 * 4; What is the value of result?

• 15

• 13

• 21

• 25

What is the main difference between a while loop and a do-while loop?

• A while loop always runs at least once, while a do-while loop may never run.

• A while loop does not require a condition, while a do-while loop does.

• A do-while loop always runs at least once, while a while loop may never run.

• They are identical in their runtime behavior.

Which method is used to read integer input from the console in Java using a Scanner object?

• scanner.nextLine()

• scanner.nextFloat()

• scanner.next()

• scanner.nextInt()

Which statement about methods in Java is FALSE?

• A method can return a value or be declared void if it returns nothing.

• A method can be overloaded by changing its parameter list.

• All method parameters in Java are passed by reference.

• The public static void main(String[] args) method is the entry point to a Java application.

Which of the following best describes the proper way to declare an array of integers in Java?

• int array = new int[10];

• int[] array = new int(10);

• int array[] = new int[10];

• array int = [10] new;

What does the final keyword do in Java variable declarations?

• It prevents the variable from being used inside a loop.

• It allows the variable to be changed only within a certain scope.

• It makes the variable constant and prevents reassignment.

• It makes the variable only accessible within the current class.

Which of the following best describes method overloading in Java?

• Having methods in multiple classes with the same name.

• Having a method with the same name but different return types only.

• Having multiple methods with the same name but different parameter lists.

• Having methods with different names but identical parameter lists.

Which statement is TRUE about selection sort compared to bubble sort?

• Selection sort always has better time complexity than bubble sort.

• Selection sort swaps elements in each pass only once.

• Selection sort depends on the array being sorted beforehand.

• Selection sort is a built-in Java method.