Java ☕ Variables

This video tutorial introduces the concept of variables in programming, emphasizing their role as containers for values. It explains the different types of variables in Java, including primitive data types like int, long, short, float, double, byte, char, and boolean, as well as the non-primitive String type. The tutorial provides guidelines for naming variables in Java, highlighting the importance of descriptive yet concise names. It also covers the process of declaring and initializing variables, with examples and a practical activity to reinforce learning.

What is the primary purpose of a variable in programming?

• To store a fixed value

• To act as a placeholder for values that can change

• To execute a specific function

• To display output to the user

Which of the following is NOT a primitive data type in Java?

• String

• int

• char

• boolean

How many bits does a 'long' data type use to store values in Java?

• 128 bits

• 64 bits

• 32 bits

• 16 bits

What is the main difference between a 'char' and a 'String' in Java?

• char is a primitive type, String is a function

• char is used for numbers, String is used for text

• char stores a single character, String stores multiple characters

• char stores multiple characters, String stores a single character

Which of the following is a correct variable name in Java?

• 1stVariable

• my-variable

• myVariable

• my variable

What is the naming convention called where each word in a variable name starts with a capital letter except the first word?

• Kebab Case

• Camel Case

• Snake Case

• Pascal Case

Which of the following is NOT allowed in a Java variable name?

• Numbers

• Spaces

• Lowercase letters

• Underscores

What is the purpose of the 'F' suffix in a float value in Java?

• To mark the end of a statement

• To denote a function

• To specify the value is a float

• To indicate a fixed value

Which data type would you use to store a true or false value in Java?

• int

• char

• boolean

• String

What is the correct way to declare a variable of type 'int' with the name 'age' and a value of 25?

• 25 int = age;

• age int = 25;

• int 25 = age;

• int age = 25;