Data Types
In Java programming, data types define the type of data that a variable can store and also specify the size and value range of that data. Each data type is predefined, which makes Java a statically typed and strongly typed language. This means every variable must be declared with a specific data type before it is used.
Data types help the compiler understand what kind of value a variable holds, such as a number, character, or logical value (true/false).
Types (Java data types are mainly divided into two categories:)
1. Primitive Data Types
Primitive data types are the basic data types used to store simple values directly in memory.
- boolean → true or false values
- char → single character (e.g., 'A')
- byte → small integer values
- short → short integer values
- int → integer numbers
- long → large integer numbers
- float → decimal numbers
- double → large decimal numbers
2. Non-Primitive Data Types
Non-primitive data types are used to store complex data and multiple values. These are also called reference types.
- String → sequence of characters (text)
- Array → collection of similar data elements
- Class → blueprint for objects
- Interface → used to achieve abstraction
Example
public class DataTypesExample {
public static void main(String[] args) {
String name = "Hello";
int number = 100;
float price = 10.5f;
char grade = 'A';
boolean isJavaEasy = true;
System.out.println("String: " + name);
System.out.println("int: " + number);
System.out.println("float: " + price);
System.out.println("char: " + grade);
System.out.println("boolean: " + isJavaEasy);
}
}
