Data Types in Java | What are the different Data Types in Java?

In Java, a data type is a classification of the type of data that a variable can hold. 

Java has two types of data: primitive and non-primitive.

Primitive data types include:

int: This data type is used to store integers (whole numbers) with a minimum value of -2^31 and a maximum value of 2^31-1.

int age = 30;
int year = 2020;
 

float: This data type is used to store decimal numbers with a single precision (32-bit).

float temperature = 23.5f;
float pi = 3.14f;
 

double: This data type is used to store decimal numbers with double precision (64-bit).

double weight = 65.23;
double salary = 100000.00;
 

char: This data type is used to store a single character (a letter, a number, or a symbol) enclosed in single quotes.

char grade = 'A';
char gender = 'M';
 

boolean: This data type can only hold the values true or false.

boolean isStudent = true;
boolean isMorning = false;
 

byte: This data type is used to store 8-bit integers.

byte age = 30;
byte b = 100;
 

short: This data type is used to store 16-bit integers.

short s = 32000;
short distance = 25;
 

long: This data type is used to store 64-bit integers.

long l = 100000;
long salary = 2000000;
 

Non-primitive data types include:

String: This is a class in Java used to store and manipulate strings of characters.

String name = "John Doe";
String address = "New York, USA";
 

Arrays: This data type is used to store a collection of variables of the same data type.

int[] numbers = new int[5];
String[] names = {"John", "Jane", "Mike"};
 

Classes: Classes are templates for creating objects, which are instances of a class.

MyClass obj = new MyClass();
Student student = new Student();
 

Interfaces: Interfaces define a set of methods that a class must implement, but do not provide implementations for those methods.

List<String> list = new ArrayList<>();
Queue<Integer> queue = new LinkedList<>();
 

Enumerations: Enumerations are used to define a set of named values.

enum Days {SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY};
Days day = Days.MONDAY;
 

It is important to use the appropriate data type for a variable to ensure that the variable can hold the expected value and to prevent errors.