【Java每日一题】20161206

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;  
    }  
}