Java Literals

In Java, literals represent fixed values that are directly written in the code. Here's an overview:

Types of Literals:

• Numeric Literals: Represent numeric values such as integers, floating-point numbers, and characters.
• String Literals: Represent sequences of characters enclosed in double quotes (").
• Boolean Literals: Represent boolean values true and false.
• Null Literal: Represents a null reference.

Numeric Literals:

• Integer Literals: Whole numbers without decimal points.
• Floating-Point Literals: Numbers with decimal points or in exponential notation (e.g., 3.14, 2.5e3).
• Character Literals: Single characters enclosed in single quotes ('A', '5').

String Literals:

• Represent sequences of characters enclosed in double quotes ("Hello, Java!").

Boolean Literals:

• Represent boolean values true and false.

Null Literal:

• Represents a reference that does not point to any object (null).

Example

public class LiteralsExample {
    public static void main(String[] args) {
        // Numeric literals
        int age = 25;
        double pi = 3.14;
        char grade = 'A';

        // String literal
        String message = "Hello, Java!";

        // Boolean literals
        boolean isJavaFun = true;
        boolean isLearning = false;

        // Null literal
        String name = null;

        System.out.println("Age: " + age);
        System.out.println("PI: " + pi);
        System.out.println("Grade: " + grade);
        System.out.println("Message: " + message);
        System.out.println("Is Java Fun? " + isJavaFun);
        System.out.println("Is Learning? " + isLearning);
        System.out.println("Name: " + name);
    }
}

Summary

Java literals represent fixed values directly written in the code. They include numeric literals (integers, floating-point numbers, characters), string literals, boolean literals, and the null literal. Understanding literals is fundamental for initializing variables and specifying constants in Java programs.