public class Exemplo {
	public static void main(String[] args) {
	  try {
	    if (args == null || args.length != 2) {
	    System.out.println("Invalid number of arguments. " + args[0] + "<input> <output>");
	    return;
	    }
	  } catch (ArrayIndexOutOfBoundsException e) {
	    System.out.println("arrayindex. " + "<input> <output>");
	    return;
	  }
	}
}