Write string compressor

StringCompressor.java

public static void main(String[] args) {
        final var line = "abaabbbc"; //Expected result: aba2b3c
        final var chars = line.toCharArray();
        int count = 0;
        char prev = ' ';
        final var result = new ArrayList<Character>();

        for (char current : chars) {
            if (current == prev) {
                count++;
            } else {
                if (count > 1) {
                    result.add((char) (count + '0'));
                }
                result.add(current);
                prev = current;
                count = 1;
            }
        }
        System.out.println(result.stream().map(String::valueOf).collect(Collectors.joining()));
    }