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String[] inputs = new String[5]; int sum = 0; for (int i = 0; i < 5; i++) { inputs[i] = scanner.next(); } for (String input : inputs) { try { int number = Integer.parseInt(input); sum += number; } catch (NumberFormatException e) { System.out.println(input + " is not an integer"); } } System.out.println(sum); / String input = scanner.nextLine(); String[] parts = input.split(" "); String x = ""; for (String part : parts) { if (!part.matches("\d+")) { System.out.println("invalid!"); return; } x += String.format("%04d", Integer.parseInt(part)); } System.out.println(x); / for (Animal9 animal : animals) { if (animal instanceof Dog8) { ((Dog8) animal).fetch(); } else if (animal instanceof Cat8) { ((Cat8) animal).climb(); } }