20161205问题解析请点击今日问题下方的“【Java每日一题】20161206”查看 

package Dec2016;    public class Ques1206 {       public static void main(String[] args){         doSex(null);     }        public static void doSex(Sex sex){          switch (sex) {            case Boy:              System.out.println("男的");              break;            case Girl:              System.out.println("女的");              break;            default:              System.out.println("出错");              break;          }      }  }    enum Sex{      Boy("男"), Girl("女");      private String sex;        Sex(String sex) {          sex = sex;      }  }

今日问题：