Methods in Java

public class Methods {

    // Static method — class level, object नाही लागत
    static void greet(String name) {
        System.out.println("नमस्कार, " + name + "!");
    }

    // Return type method
    static int add(int a, int b) {
        return a + b;
    }

    // Return double
    static double average(int[] marks) {
        int sum = 0;
        for (int m : marks) sum += m;
        return (double) sum / marks.length;
    }

    public static void main(String[] args) {
        greet("Rahul");           // नमस्कार, Rahul!
        greet("Priya");

        int result = add(10, 20);
        System.out.println("Sum: " + result);   // 30

        int[] marks = {85, 90, 78, 92};
        System.out.printf("Average: %.2f%n", average(marks));  // 86.25
    }
}

// Method overloading — same name, different signatures
static int add(int a, int b) {
    return a + b;
}

static double add(double a, double b) {
    return a + b;
}

static int add(int a, int b, int c) {
    return a + b + c;
}

// Java automatically सही method निवडतो
System.out.println(add(1, 2));         // 3 — int version
System.out.println(add(1.5, 2.5));     // 4.0 — double version
System.out.println(add(1, 2, 3));      // 6 — three param version

// Factorial — n! = n × (n-1) × ... × 1
static long factorial(int n) {
    if (n <= 1) return 1;       // base case
    return n * factorial(n - 1); // recursive call
}

// Fibonacci
static int fibonacci(int n) {
    if (n <= 1) return n;
    return fibonacci(n - 1) + fibonacci(n - 2);
}

System.out.println("5! = " + factorial(5));     // 120
System.out.println("fib(8) = " + fibonacci(8)); // 21