Java Data Types

Java data types represent the type of data that variables can store. Here's a summary:

Primitive Data Types:

• Represent basic values and are predefined by the language.
• Include integer types (int, long, short, byte), floating-point types (float, double), characters (char), and boolean (boolean).

Integer Types:

• int: Represents 32-bit signed integers.
• long: Represents 64-bit signed integers.
• short: Represents 16-bit signed integers.
• byte: Represents 8-bit signed integers.

Floating-Point Types:

• float: Represents 32-bit floating-point numbers.
• double: Represents 64-bit floating-point numbers (default for floating-point literals).

Character Type:

• char: Represents a single 16-bit Unicode character.

Boolean Type:

• boolean: Represents a boolean value (true or false).

Reference Data Types:

• Represent references to objects.
• Include classes, interfaces, arrays, and enumerations.

Example

public class DataTypesExample {
    public static void main(String[] args) {
        // Primitive data types
        int age = 25;
        long population = 7000000000L;
        float pi = 3.14f;
        double price = 99.99;
        char grade = 'A';
        boolean isJavaFun = true;

        // Reference data types
        String name = "John";
        int[] numbers = {1, 2, 3, 4, 5};
        Object obj = new Object();

        System.out.println("Age: " + age);
        System.out.println("Population: " + population);
        System.out.println("Pi: " + pi);
        System.out.println("Price: " + price);
        System.out.println("Grade: " + grade);
        System.out.println("Is Java Fun? " + isJavaFun);
        System.out.println("Name: " + name);
        System.out.println("First Number: " + numbers[0]);
    }
}

Summary

Java supports primitive data types (integers, floating-point numbers, characters, booleans) and reference data types (objects, arrays). Understanding data types is essential for defining variables and writing Java programs that manipulate different types of data.