Java Variables and Data Types

In Java, variables are used to store data. Every variable in Java must be declared with a data type. Here are some of the common data types:

• int - used for integers
• double - used for decimal numbers
• boolean - used for true/false values
• char - used for single characters
• String - used for sequences of characters (strings)

Example of Variables in Java

public class VariablesExample {
    public static void main(String[] args) {
        int age = 25;
        double salary = 55000.50;
        boolean isEmployed = true;
        char grade = 'A';
        String name = "John";

        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
        System.out.println("Salary: " + salary);
        System.out.println("Employed: " + isEmployed);
        System.out.println("Grade: " + grade);
    }
}
    

This example demonstrates how to declare and use variables in Java. The program prints the values of the variables to the console.