接收整数并以字符串形式返回的方法

Question

I have an exercice to do but i cant seem to do a thing. We have to transform an integer that the user chooses and then convert it to string, for ex: input = 2409 output = two, four, zero, nine

if someone could help i would be very appreciated

i can do only if the input has only one digits, but cant do it with multiple digits.

Answer 1

First create your hashmap describing the mapping of digits to words. The rest is simple comparison:

public static void printDigitsAsWords(int n) {
  String s = String.valueOf(n); 
  String[] digits = s.split("");
    
  Map<String, String> map = Map.of(
      "0", "zero",
      "1", "one",
      "2", "two",
      "3", "three",
      "4", "four",
      "5", "five",
      "6", "six",
      "7", "seven",
      "8", "eight",
      "9", "nine"
    );
    
  String result = Arrays.stream(digits)
      .map(digit -> map.get(digit))
      .collect(Collectors.joining(", "));

  System.out.println(result);
}