Variables and datatypes in java

Variables are containers that store data in a program. Every variable has:

1. Type → What kind of data it can store (number, text, etc.)

2. Name → Identifier for the variable

3. Value → The actual data stored

Syntax for Variable

dataType variableName = value;

• dataType → int, double, char, String, etc.

• variableName → name you give to the variable

• value → data you assign

Example

public class Main {

public static void main(String[] args) {

int age = 20; // integer variable

String name = "Preethika"; // text variable

System.out.println("Name: " + name);

System.out.println("Age: " + age);

}

}

Data Types

A data type specifies what kind of data a variable can store. Java has two main types of data types.

1.Primitive Data Types

2.Non – Primitive Data Types

Primitive Data Types

Non-Primitive Data Types

These are more complex types, like:

• String → Stores text

• Arrays → Store multiple values of the same type

• Classes → User-defined objects

Example

public class Main {

public static void main(String[] args) {

int age = 25;

double salary = 55000.50;

char grade = 'A';

boolean isPassed = true;

String name = "Preethika";

System.out.println("Name: " + name);

System.out.println("Age: " + age);

System.out.println("Salary: " + salary);

System.out.println("Grade: " + grade);

System.out.println("Passed: " + isPassed);

}