public static void main(String[] d) {
    // this is not a complete test
    String input = "This iS a test. NoThing more. 噴 for exAmple";
    ArrayList<String> result = new ArrayList<>();
    int length = input.length();
    // we will split the input into a sequence of sections, each which end when
    // we go lower case to upper case
    int start = 0;
    // pointer is which character we are checking
    int pointer = start;
    while (pointer < length - 1) // go through input
    {
      char thisChar = input.charAt(pointer);
      char nextChar = input.charAt(pointer + 1);
      if (Character.isLowerCase(thisChar) && Character.isUpperCase(nextChar)) { // found a new section
        String sub = input.substring(start, pointer + 1);
        result.add(sub);
        start = pointer + 1;
      }
      pointer++; // move on
    }
    // need to add final section
    String sub = input.substring(start, length);
    result.add(sub);
    for (String s : result) {
      System.out.println(s);
    }

  }
output:
This i
S a test. No
Thing more. 噴 for ex
Ample