Checking if i=4 or 5 or 6 in single if condition without using logical operators

I tried and found two solutions. One is mathematical and other one is just a java trick.

Mathematical solution:

public class Test1 {
 public static void main(String[] args) {
  int i = Integer.parseInt(args[0]);
  if((i-4)*(i-5)*(i-6) == 0 ){
   System.out.println("4<=i<=6");
  }else{
   System.out.println("i!=4or5or6");
  }
 }
}

Other solution is bit tricky:

public class Test2 {
 public static void main(String[] args) {
  int i = Integer.parseInt(args[0]);
  if("4,5,6".indexOf(String.valueOf(i)) >=0){
   System.out.println("4<=i<=6");
  }else{
   System.out.println("i!=4or5or6");
  }
 }
}