枚举和注解

枚举类的使用

枚举类的定义

enum SeasonEnums {
    //提供当前枚举类的对象
    SPRING("春天", "春暖花开"), SUMMER("夏天", "夏日炎炎"), AUTUMN("秋天", "秋高气爽"), WINNER("冬天", "冰天雪地");

    private final String name;
    private final String desc;

    SeasonEnums(String name, String desc) {
        this.name = name;
        this.desc = desc;
    }

    public String getName() {
        return name;
    }


    public String getDesc() {
        return desc;
    }

    @Override
    public String toString() {
        return "SeasonEnums{" +
                "name='" + name + '\'' +
                ", desc='" + desc + '\'' +
                '}';
    }
}

枚举类的方法使用

System.out.println(SeasonEnums.WINNER);


//1. values（）获取所有的枚举对象
SeasonEnums[] values = SeasonEnums.values();
for (SeasonEnums value : values) {
	System.out.println(value);
}
//2. valueOf(String str)通过枚举对象名，获取对应枚举对象信息
SeasonEnums spring = SeasonEnums.valueOf("SPRING");
System.out.println(spring);


/*
SeasonEnums{name='冬天', desc='冰天雪地'}
SeasonEnums{name='春天', desc='春暖花开'}
SeasonEnums{name='夏天', desc='夏日炎炎'}
SeasonEnums{name='秋天', desc='秋高气爽'}
SeasonEnums{name='冬天', desc='冰天雪地'}
SeasonEnums{name='春天', desc='春暖花开'}
*/

枚举类实现接口的方式

枚举类中实现抽象方法

enum SeasonEnums implements Show {
    //提供当前枚举类的对象
    SPRING("春天", "春暖花开"), SUMMER("夏天", "夏日炎炎"), AUTUMN("秋天", "秋高气爽"), WINNER("冬天", "冰天雪地");

    private final String name;
    private final String desc;

    SeasonEnums(String name, String desc) {
        this.name = name;
        this.desc = desc;
    }

    public String getName() {
        return name;
    }


    public String getDesc() {
        return desc;
    }

    @Override
    public String toString() {
        return "SeasonEnums{" +
                "name='" + name + '\'' +
                ", desc='" + desc + '\'' +
                '}';
    }


    //枚举类实现接口的一种方式
    @Override
    public void show() {
        System.out.println("这是一个季节");
    }
}

枚举对象中实现抽象方法

enum SeasonEnums implements Show {
    //提供当前枚举类的对象
    SPRING("春天", "春暖花开"){
        @Override
        public void show() {
            System.out.println("春天在哪里");
        }
    }, SUMMER("夏天", "夏日炎炎"){
        @Override
        public void show() {
            System.out.println("宁夏");
        }
    }, AUTUMN("秋天", "秋高气爽"){
        @Override
        public void show() {
            System.out.println("秋天不回来");
        }
    }, WINNER("冬天", "冰天雪地"){
        @Override
        public void show() {
            System.out.println("大约在冬季");
        }
    };

    private final String name;
    private final String desc;

    SeasonEnums(String name, String desc) {
        this.name = name;
        this.desc = desc;
    }

    public String getName() {
        return name;
    }


    public String getDesc() {
        return desc;
    }

    @Override
    public String toString() {
        return "SeasonEnums{" +
                "name='" + name + '\'' +
                ", desc='" + desc + '\'' +
                '}';
    }

}