给定一个字符串 s ，请你找出其中不含有重复字符的最长子串的长度。

private static void stringSubLen(String msg) {
    int max = 0;
    int left = 0;
    Map<Character,Integer> map = new HashMap<>();
    for (int i = 0; i < msg.length(); i++){
        if (map.containsKey(msg.charAt(i))){
            int diff = i - map.get(msg.charAt(i));
            System.out.println(max +" , "+left +" , " + diff);
            if (diff > left){
                left = left + 1;
            } else {
                left = diff;
            }
        } else {
            left ++ ;
        }
        max = Math.max(max,left);
        map.put(msg.charAt(i), i);
    }
    System.out.println(max);
}

public static void main(String[] args) {
    //打印字符串不重复之间的间隔
    Scanner scanner = new Scanner(System.in);
    String text = scanner.next();
    stringSubLen(text);
}