枚举 day22

枚举类型是Java中一种用于统一管理有限的常量数据的数据类型。
它将常量设置为对象，提高了代码的可读性和简洁性。
通过使用枚举类型，可以在代码中更方便地读取和使用常量。

package com.shujia.day22;

/*
    1. 创建枚举类的属性(成员变量)，必须是作为私有常量出现
    2. 必须将构造方法私有化，这是为了保证类的对象是有限个的目的
    3. 提供公共的静态的final方法给外界获取枚举类中多个对象
    4. 提供公共的获取属性的方法
    5. 重写toString()方法
 */
class Season{
    private String name;
    private String describe;

    private Season(){}

    private Season(String name,String describe){
        this.name = name;
        this.describe = describe;
    }

    public static final Season SPRING = new Season("春天","春暖花开");
    public static final Season SUMMER = new Season("夏天","夏日炎炎");
    public static final Season AUTUMN = new Season("秋天","硕果累累");
    public static final Season WINTER = new Season("冬天","万里雪疆");

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescribe() {
        return describe;
    }

    public void setDescribe(String describe) {
        this.describe = describe;
    }

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

public class EnumDemo1 {
    public static void main(String[] args) {
        Season summer = Season.SUMMER;
        System.out.println(summer.getName());
        System.out.println(summer.getDescribe());
    }
}

package com.shujia.day22;

/*
    在jdk1.5之后，java提供了一关键词，可以描述一个枚举类  enum

    1. 将枚举相关的对象放在开头
    SPRING("春天", "春暖花开")
    2. 创建枚举类的属性(成员遍历)，必须是作为私有常量出现
    3. 必须将构造方法私有化，这是为了保证类的对象是有限个的目的
    4. 提供公共的获取属性的方法
    5. 重写toString()方法

 */

enum Season2{
    //表示有限个对象，必须放在枚举类第一个部分
    SPRING("春天","春暖花开"),
    SUMMER("夏天","夏日炎炎"),
    AUTUMN("秋天","硕果累累"),
    WINTER("冬天","万里雪疆");


    private String name;
    private String describe;

    private Season2(){}

    private Season2(String name,String describe){
        this.name = name;
        this.describe = describe;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescribe() {
        return describe;
    }

    public void setDescribe(String describe) {
        this.describe = describe;
    }

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


public class EnumDemo2 {
    public static void main(String[] args) {
        Season2 spring = Season2.SPRING;
        Season2 summer = Season2.SUMMER;

        System.out.println(spring);
        System.out.println(summer);
    }
}