public class Hellows { public static void main(String[] args) { try { int j = Integer.parseInt(args[0]); for (int i = 0; i < j; i++) { System.out.println("Hello World! " + (i+1)); } } catch (ArrayIndexOutOfBoundsException e) { System.out.println(" java Hellows 1 のように実行してください"); } } }