Java——》获取map中最小key，最小value

    public Object getMinKey(Map map){
        Set set = map.keySet();
        Object[] obj = set.toArray();
        Arrays.sort(obj);
        //最小key
        Integer minKey = (Integer) obj[0];
        return minKey;
    }

    public Object getMinValue(Map map){
        Collection c = map.values();
        Object[] obj = c.toArray();
        Arrays.sort(obj);
        //最小value
        String minValue = (String) obj[0];
        return minValue;
    }