Yo dawg, I heard you like FORTRAN 77 and COBOL.

just else will not work because if n=0 then the function will throw illegalargumentexception. your else if works best :)

thanks

Using the same type of condition in two 'if' statements seems redundant. Just an 'else' would do just fine.

else if(n!=0){
throw new IllegalArgumentException("Oh no");
}

if ever you wanted to use the else-if condition