Enum学习

/**
 * @Auther: hs
 * @Date: 2019/2/24 12:57
 * @Description:私有构造，枚举单例
 */
@AllArgsConstructor(access = AccessLevel.PRIVATE)
@Getter
public enum  Day {
    MONDAY("星期一"),
    TUESDAY("星期二"),
    WEDNESDAY("星期三"),
    THURSDAY("星期四"),
    FRIDAY("星期五"),
    SATURDAY("星期六"),
    SUNDAY("星期日");
    private String desc;//中文描述

    public static void main(String[] args) {
        //遍历所有枚举获取name和值
        for (Day day:Day.values()) {
            System.out.println(day.name()+","+day.getDesc());
        }
        //调用name()方法，表示是string类型，valueof转成枚举
        Day day = Day.valueOf(Day.MONDAY.name());

    }
}

//------------------------------写法一-----------------------------------
/**
 * @Auther: hs
 * @Date: 2019/2/24 12:57
 * @Description:与常规抽象类一样，enum类允许我们为其定义抽象方法，
 * 然后使每个枚举实例都实现该方法，以便产生不同的行为方式，抽象方法放在最后
 */
public interface Day {

    enum DayType{
        MONDAY{
            @Override
            public String getInfo() {
                return "周一";
            }
        },
        TUESDAY{
            @Override
            public String getInfo() {
                return "周二";
            }
        };
        public abstract String getInfo();
    }
    public static void main(String[] args) {
        System.out.println(DayType.MONDAY.getInfo());
    }
}
//-------------------------------写法二-----------------------------------
/**
 * @Auther: hs
 * @Date: 2019/2/24 12:57
 * @Description: 接口中定义抽象方法，与方法一类似
 */
public interface Day {

    String getInfo();

    enum DayType implements Day{
        MONDAY {
            @Override
            public String getInfo() {
                return "周一";
            }
        },
        TUESDAY{
            @Override
            public String getInfo() {
                return "周二";
            }
        };
    }
    public static void main(String[] args) {
        System.out.println(DayType.MONDAY.getInfo());
    }
}

package com.staryea.jsondemo.test;

/**
 * @Auther: hs
 * @Date: 2019/2/24 12:57
 * @Description:
 */
public interface Food {
    String getInfo();
    enum Appetizer implements Food {
        SALAD, SOUP, SPRING_ROLLS;

        @Override
        public String getInfo() {
            return null;
        }
    }
    enum MainCourse implements Food {
        LASAGNE, BURRITO, PAD_THAI,
        LENTILS, HUMMOUS, VINDALOO;

        @Override
        public String getInfo() {
            return null;
        }
    }
    enum Dessert implements Food {
        TIRAMISU, GELATO, BLACK_FOREST_CAKE,
        FRUIT, CREME_CARAMEL;

        @Override
        public String getInfo() {
            return null;
        }
    }
    enum Coffee implements Food {
        BLACK_COFFEE, DECAF_COFFEE, ESPRESSO,
        LATTE, CAPPUCCINO, TEA, HERB_TEA;

        @Override
        public String getInfo() {
            return CAPPUCCINO.name();
        }
    }
}

标签：enum,return,String,getInfo,Enum,public,学习,Day
来源： https://blog.csdn.net/qq_26869339/article/details/87903995