Pre-Test (Programming Java) 2024

Which of the following is a primitive data type in Java?

• String
• Integer
• float
• Double

In Java, what is the keyword used for declaring a variable explicitly?

• var
• int
• let
• const

What is the default value of an uninitialized boolean variable in Java?

• true
• false
• null
• undefined

Which of the following is not a Java access modifier?

• public
• private
• protected
• static

Which of the following statements is true about Java virtual machine (JVM)?

• JVM is an interpreter that executes Java bytecode.
• JVM is a compiler that generates Java bytecode.
• JVM is a library that provides Java standard classes.
• JVM is a tool that optimizes Java code

Which of the following operators is used to create a new object in Java?

• new
• create
• init
• return

Which of the following is not a valid identifier in Java?

• _first_name
• First_Name
• first name
• firstName

Which of the following is a valid way to declare a multi-dimensional array in Java? (Choose 2)

• int[] arr = {1, 2, 3};
• int[][] arr = {{1, 2}, {3, 4}};
• int[2][2] arr = {{1, 2}, {3, 4}};
• int arr[][] = {{1, 2}, {3, 4}};

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

• A while loop is always executed at least once, while a do-while loop may not be executed at all.
• A do-while loop is always executed at least once, while a while loop may not be executed at all.
• A while loop and a do-while loop are the same thing.
• A do-while loop is faster than a while loop.

What is the difference between a break statement and a continue statement in Java?

• A break statement terminates the current loop, while a continue statement skips the current iteration of the loop.
• A continue statement terminates the current loop, while a break statement skips the current iteration of the loop.
• A break statement and a continue statement are the same thing.
• A continue statement is faster than a break statement.