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Creating Methods

public class Methods {

    // Method with no return value
    static void greet(String name) {
        System.out.println("Hello, " + name + "!");
    }

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

    // Method with default-like behavior (overloading)
    static double area(double radius) {
        return Math.PI * radius * radius;
    }

    static double area(double width, double height) {
        return width * height;
    }

    public static void main(String[] args) {
        greet("Alice");              // Hello, Alice!
        int sum = add(5, 3);         // 8

        System.out.println(area(5));      // Circle area: 78.53
        System.out.println(area(4, 6));   // Rectangle area: 24.0
    }
}

Method Overloading

Same method name, different parameter lists. Java picks the right one automatically!

static int multiply(int a, int b) { return a * b; }
static double multiply(double a, double b) { return a * b; }
static int multiply(int a, int b, int c) { return a * b * c; }

multiply(3, 4);       // Calls int version → 12
multiply(2.5, 3.0);   // Calls double version → 7.5
multiply(2, 3, 4);    // Calls 3-arg version → 24

Varargs (Variable Arguments)

static int sum(int... numbers) {
    int total = 0;
    for (int n : numbers) {
        total += n;
    }
    return total;
}

sum(1, 2);           // 3
sum(1, 2, 3, 4, 5);  // 15

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