What are the data types of java

The data type defines the type of value stored in the variable and determines the scope and operation of the variable. There are 8 primitive data types and two reference types in Java. Integer type: byte, short, int, long Floating point type: float, double Character type: char Boolean type: boolean Array: Collection class used to store elements of the same type: used to define and create objects

Java Data Types

What are data types?

Data types define the types of values ​​that variables can store. It determines the scope, precision, and operation of the variable.

Data types in Java

There are 8 main primitive data types and two reference types in Java:

Primitive data types

• Integer type: byte, short, int, long
• Floating point type: float, double
• Character type: char
• Boolean type: boolean

Reference type

• Array: Used to store a collection of elements of the same type
• Class: Used to define and create objects

Primitive data type

Integer type

Stores integers, with different lengths and ranges:

• byte: 8 bits, range: -128 to 127
• short: 16 bits, range: -32,768 to 32,767
• int: 32 bits, range: -2,147,483,648 to 2,147,483,647
• long : 64 bits, range: -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807

##Floating point type

Storage floating point number (decimal):

float: 32 bits, the precision is about 6-7 significant digits
• double: 64 bits, the precision is about 15-16 significant digits

Character type

Stores a single character, the bottom layer uses Unicode character encoding:

char: 16 bits, can store any Unicode character

Boolean type

Storing boolean value (true or false):

boolean: true or false

Reference type

Array

Reference type, which can store a collection of elements of the same type:

int[] numbers = {1, 2, 3} ;

Class

Reference type, used to define and create objects:

class Person { String name; int age ; }

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