枚举类的使用

1..创建一个Student实体类
public class Student {
    private  String  name;  //姓名
    private  Gender  sex;   //性别  类型是个枚举
    private  int  age;

    @Override
    public String toString() {
        return "Student [name=" + name + ", sex=" + sex + ", age=" + age + "]";
    }

    public Student() {
        super();
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public Gender getSex() {
        return sex;
    }

    public void setSex(Gender sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }

}

2.创建对应的枚举类

 /**                     枚举类  (像类 又像数组)
 *                     01.只能有私有化的构造方法！  外部不能访问！
 *                     02.所有的枚举值都是public  static  final
 */
public enum Gender {
    //枚举值  静态常量大写
     MAN(1,"男"),WOMAN(0,"女");

      private  int   index;
      private  String   sex;

      private Gender(int index,String sex){
          this.index=index;
          this.sex=sex;
      }

    public int getIndex() {
        return index;
    }

    public void setIndex(int index) {
        this.index = index;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

}

3.创建测试类

public class EnumTest {

    public static void main(String[] args) {
        //创建一个Student对象
        Student student=new Student();
        /*
         *想避免不健康的输入
         *01.使用set() 做判断
         *02.使用枚举  ：规范了参数的类型
         */
        student.setSex(Gender.MAN);
        System.out.println("学生的性别是："+student.getSex());

        //遍历枚举中的数据
        for (Gender g : Gender.values()) {
            System.out.println(g.getSex());
        }

    }

}