java basic enumeration

1. How to customize the enumeration class

①Provide the attributes of the class and declare it as private final

② Properties declared as final are initialized in the constructor

③ Call properties through public methods

④Create an object of the enumeration class: declare the object of the class as public static final

//Enumeration class
    class Season{
        //1. Provide the properties of the class, declared as private final
        private final String seasonName;
        private final String seasonDesc;

        //2. The properties declared as final are initialized in the constructor
        private Season(String seasonName ,String seasonDesc){
            this.seasonName=seasonName;
            this.seasonDesc=seasonDesc;
        }
        //3. Call properties through public methods
        public String getSeasonName() {
            return seasonName;
        }

        public String getSeasonDesc() {
            return seasonDesc;
        }
        / /4. Create an object of the enumeration class: declare the object of the class as public static final
        public static final Season SPRING = new Season("spring", "春暖花开");
        public static final Season SUMMER = new Season("summer", "夏日炎炎");
        public static final Season FALL = new Season("fall", "秋高气爽");
        public static final Season WINTER = new Season("winter", "白雪皑皑");

        @Override
        public String toString() {
            return "Season [seasonName=" + seasonName + ", seasonDesc=" + seasonDesc + "]";
        }
    }

1> How to make the enumeration class implement the interface: You can make the objects of different enumeration tired to call the overridden abstract method, which is equivalent to letting each object rewrite the abstract method
    //4. Create an object of the enumeration class: put the class's The object is declared as public static final
        SPRING("spring", "Spring blossoms"){
            public void show(){
                System.out.println("Where is spring?");
            }
        }

2. How to use the enum keyword to define an enumeration class

Method ①:

//public static final Season SPRING = new Season();
    SPRING(){
        public void show(){
            System.out.println("我是春天!");
        }
    },
    //public static final Season SUMMER = new Season();
    SUMMER(){
        public void show(){
            System.out.println("我是夏天!");
        }
    },
    //public static final Season FALL = new Season();
    FALL(){
        public void show(){
            System.out.println("我是秋天!");
        }
    },
    //public static final Season WINTER = new Season();
    WINTER(){
        public void show(){
            System.out.println("I am winter");
        }
    };
    private Season1(){}

Method ②:

public enum Season {
SPRING,SUMMER,FALL,WINTER;
}

3. The method of enum:
values
returns an array
valueOf(String name) containing enum objects;
returns the corresponding enumeration object

java basic enumeration

Guess you like