public class Overloading { public void show(String str) { if (str == null) throw new RuntimeException("input cannot be null"); System.out.println(str); } public void show(Integer i) { if (i == null) throw new RuntimeException("input cannot be null"); System.out.println(i); } public static void main(String[] args) { Overloading overloading = new Overloading(); overloading.show(null); } }