Counting unique characters in a String given by the user

Question

I have to write a program that counts the uniques characters in a String given by the user. For example \"abc\" returns 3 and \"aabbccd\" returns 4. I am not allow to use advan

Answer 1

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    System.out.println("Please enter String:");
    int length = scanner.nextInt();
    char[] ch1 =  new char[length];
    String[] input = new String[length];
    for (int i = 0; i < length; i++) {
        String userInput = scanner.next();
        input[i] = userInput;
         ch1= userInput.toCharArray();

        Arrays.sort(ch1);
         System.out.println(ch1);
    }