public static void isGTE(String argName,long i,long min){
  if (i < min) {
    throw new IllegalArgumentException(String.format("%s must be >= %d; was %d",argName,min,i));
  }
}

public static void isGTE ( String argName , long i , long min ) { if ( i < min ) { throw new IllegalArgumentException ( String . format ( "%s must be >= %d; was %d" , argName , min , i ) ) ; } }
makes sure the given number is greater than or equal to the given minimum .
