Converts phone digits to string

phoneKeyboardToString.java

import java.util.HashMap;

class Scratch {
    public static void main(String[] args) {

        String s = "444 2 6 444 66 33 888 444 8 2 22 555 33";

        HashMap<String, String> numToLetters = new HashMap<>();
        numToLetters.put("2", "abc");
        numToLetters.put("3", "def");
        numToLetters.put("4", "ghi");
        numToLetters.put("5", "jkl");
        numToLetters.put("6", "mno");
        numToLetters.put("7", "pqrs");
        numToLetters.put("8", "tuv");
        numToLetters.put("9", "wxyz");
        numToLetters.put("0", " ");


        String[] split = s.split("");
        State st = State.INIT;
        String curPress = "";
        Integer countPresses = 0;

        for (String s1 : split) {
            if (st == State.INIT) {
                curPress = s1;
                countPresses = 1;
                st = State.SUBNUMBER;
            } else if (curPress.equals(s1)) {
                countPresses += 1;
            } else if (s1.equals(" ")) {
                flush(numToLetters, curPress, countPresses);
                curPress = "";
                countPresses = 0;
                st = State.INIT;
            } else {
                flush(numToLetters, curPress, countPresses);
                curPress = s1;
                countPresses = 1;
                st = State.SUBNUMBER;
            }
        }
        if (st != State.INIT)
            flush(numToLetters, curPress, countPresses);


    }

    private static void flush(HashMap<String, String> numToLetters, String curPress, Integer countPresses) {
        String s2 = numToLetters.get(curPress);
        String s3 = s2.split("")[(countPresses - 1) % s2.length()];
        System.out.println(s3);
    }

    enum State {
        INIT, SUBNUMBER
    }
}