public class Overload {
    public static void what(double d) {
        System.out.println("It's a double");
    }
    public static void what(String s) {
        System.out.println("It's a string");
    }
    public static void what(int i) {
        System.out.println("It's an integer");
    }
    public static void main(String[] args) {
        what(3);
        what("hi");
        what(2.4);
    }
}