Primitive data types in Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are primitive data types in Java?

Primitive data types are the most basic data types built into the Java language. They store simple values like numbers, characters, and true/false values directly in memory.

beginner

Name the 8 primitive data types in Java.

The 8 primitive data types are: byte, short, int, long, float, double, char, and boolean.

beginner

What is the difference between int and long in Java?

int stores 32-bit integer values, while long stores 64-bit integer values. Use long when you need to store bigger whole numbers.

beginner

Which primitive data type would you use to store a single character?

Use the char data type to store a single character, like a letter or symbol. It uses 16 bits and stores Unicode characters.

beginner

What values can a boolean hold in Java?

A boolean can hold only two values: true or false. It is used to represent simple yes/no or on/off states.

Which of these is NOT a primitive data type in Java?

A String

B int

C boolean

D char

String is not a primitive type; it is a class in Java. The others are primitive data types.

What is the size of a float in Java?

A 64 bits

B 8 bits

C 16 bits

D 32 bits

A float uses 32 bits to store decimal numbers.

Which primitive type would you use to store the value true?

A int

B char

C boolean

D double

boolean stores true or false values.

What is the default value of an int variable in Java?

A null

B 0

C false

D 1

The default value of an int is 0 when declared as a class member.

Which primitive type can store the largest range of whole numbers?

A long

B short

C int

D byte

long stores 64-bit integers, which is the largest range among integer primitives.

Explain what primitive data types are in Java and list all of them.

Think about simple values like numbers and true/false.

Describe when you would use int versus long in Java.

Consider the size in bits and the range of values.