Exploring Primitive Types in AP Computer Science A

This video tutorial by AJ provides an in-depth review of Unit 1: Primitive Types for AP Computer Science A. It covers the basics of variables, data types, and constants in Java, including integers, doubles, booleans, and strings. The tutorial explains how to create and modify variables, perform arithmetic operations, and understand the concept of casting. It also includes a practice test with questions and answers to help students prepare for exams.

What is the purpose of a variable in Java?

• To create user interfaces

• To manage network connections

• To store data in the computer's memory

• To perform arithmetic operations

Which data type in Java is used to store whole numbers without decimal places?

• double

• String

• boolean

• int

What is the correct way to declare a double variable named 'myDouble' with a value of 7.6?

• double myDouble = 7.6;

• int myDouble = 7.6;

• boolean myDouble = 7.6;

• String myDouble = 7.6;

How do you declare a constant integer variable named 'HOURS_IN_A_DAY' with a value of 24?

• int HOURS_IN_A_DAY = 24;

• const int HOURS_IN_A_DAY = 24;

• final int HOURS_IN_A_DAY = 24;

• static int HOURS_IN_A_DAY = 24;

What is the result of the expression 12 % 5 in Java?

• 0

• 5

• 12

• 2

What is the result of casting the double value 7.8 to an integer?

• 7.8

• 8

• 7

• 8.0

Why does casting a double to an integer truncate the decimal part?

• Because it removes the decimal part

• Because it converts the value to a string

• Because it multiplies the value by 10

• Because it rounds the value

What is the maximum value that can be stored in a 4-byte integer?

• 4,294,967,295

• 2,147,483,647

• 2,147,483,648

• 1,073,741,824

Which data type should you use to store a value larger than 2 billion?

• int

• long

• boolean

• double

Which of the following data types is not considered a primitive data type?

• boolean

• String

• double

• int