1class scratch{
2 public static Number haha(Number yo){
3 return yo;
4 }
5
6 public static void main(String[] args) {
7 System.out.println(haha( (int) 5 ));
8 System.out.println(haha( (double) 5.0 ));
9 System.out.println(haha( (long) 5 ));
10 System.out.println(haha( (float) 5.0 ));
11 //all of these classes extend the java.lang.Number class
12
13 System.out.println(haha("Hey"));
14 //error because the java.lang.String class does not extend the java.lang.Number class
15 }
16}