TreeMap运行错误

Exception in thread "main" java.lang.ClassCastException: Day16_TreeMap.Star cannot be cast to java.lang.Comparable

提示类型转换错误，

public static void main(String[] args) {    TreeMap<Star, String> Tr = new TreeMap<Star,String>();    //下句出错    Tr.put(new Star("刘诗诗",22,"女"), "s001");

star类重写了compareTo方法，也提示类型转换报错

star类 书写有错，类型没有规范就到位

总结：低级错误