মেথড (Methods)

public class Main {
    // void method — does something but returns nothing
    static void greet(String name) {
        System.out.println("Hey, " + name + "! Welcome aboard.");
    }

    // Method that returns a value
    static int add(int a, int b) {
        return a + b;
    }

    // Method with a boolean return
    static boolean isEven(int number) {
        return number % 2 == 0;
    }

    // Method with multiple lines of logic
    static String getLetterGrade(int score) {
        if (score >= 90) return "A";
        if (score >= 80) return "B";
        if (score >= 70) return "C";
        if (score >= 60) return "D";
        return "F";
    }

    public static void main(String[] args) {
        greet("Asif");
        greet("Sam");

        int sum = add(15, 27);
        System.out.println("15 + 27 = " + sum);

        System.out.println("Is 4 even? " + isEven(4));
        System.out.println("Is 7 even? " + isEven(7));

        System.out.println("Score 85 = " + getLetterGrade(85));
    }
}

Hey, Asif! Welcome aboard.
Hey, Sam! Welcome aboard.
15 + 27 = 42
Is 4 even? true
Is 7 even? false
Score 85 = B

public class Main {
    // Version 1: multiply two ints
    static int multiply(int a, int b) {
        return a * b;
    }

    // Version 2: multiply three ints
    static int multiply(int a, int b, int c) {
        return a * b * c;
    }

    // Version 3: multiply two doubles
    static double multiply(double a, double b) {
        return a * b;
    }

    // Overloaded print helpers
    static void printInfo(String name) {
        System.out.println("Name: " + name);
    }

    static void printInfo(String name, int age) {
        System.out.println("Name: " + name + ", Age: " + age);
    }

    public static void main(String[] args) {
        System.out.println("2 * 3 = " + multiply(2, 3));
        System.out.println("2 * 3 * 4 = " + multiply(2, 3, 4));
        System.out.println("2.5 * 3.5 = " + multiply(2.5, 3.5));

        printInfo("Laboni");
        printInfo("Laboni", 12);
    }
}

2 * 3 = 6
2 * 3 * 4 = 24
2.5 * 3.5 = 8.75
Name: Laboni
Name: Laboni, Age: 12