1、求出字符串abbddbb中重复最多的数据

代码：

String ss = "abbddbb";
char[] chars = ss.toCharArray();
TreeMap<Character,Integer> treeMap = new TreeMap<>(Map.Entry<Character,Integer>(
        new Comparator<Map.Entry<Character,Integer>>() {
            @Override public int compare(Map.Entry<Character,Integer> e1, Map.Entry<Character,Integer> e2) {
                int res = e1.getValue().compareTo(e2.getValue());
                return res != 0 ? res : 1;
            }
 });

for (int i = 0; i < chars.length; i++) {
    if(treeMap.isEmpty()){
        treeMap.put(chars[0],1);
    }else{
        if(treeMap.containsKey(chars[i])){
            treeMap.put(chars[i],treeMap.get(chars[i])+1);
        }else{
            treeMap.put(chars[i],1);
        }
    }
}
log.info("treeMap-->>"+treeMap);