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  • Enum枚举学习- java5之前和之后的写法

    enum枚举

    JDK1.5以前枚举的写法

    /**
     * java5.0以前,定义枚举类。类中的对象是有限的
     * @author amber
     *
     */
    public class Season {
        private final String seasonName;
        private final String seasonDescription;
        
        private Season(String seasonName, String seasonDescription) {
            this.seasonName = seasonName;
            this.seasonDescription = seasonDescription;
        }
    
        public String getSeasonName() {
            return seasonName;
        }
    
        public String getSeasonDescription() {
            return seasonDescription;
        }
        
        //定义枚举对象
        public static final Season SPRING = new Season("春天", "春意盎然");
        public static final Season SUMMER = new Season("夏天", "夏日炎炎");
        public static final Season AUTUMN = new Season("秋天", "秋风习习");
        public static final Season WINTER = new Season("冬天", "白雪皑皑");
    
        @Override
        public String toString() {
            return "Season [seasonName=" + seasonName + ", seasonDescription=" + seasonDescription + "]";
        }
    }

    java5以后枚举的写法

    /**
     * java5.0以后,定义枚举类。类中的对象是有限的
     * @author amber
     *
     */
    public enum Season1 {
        //定义枚举对象.需要把对象放在第一行
        SPRING ("春天", "春意盎然"){
            @Override
            public void show() {
                System.out.println("This is Spring!");
            }
        },
        SUMMER ("夏天", "夏日炎炎"),
        AUTUMN ("秋天", "秋风习习"),
        WINTER ("冬天", "白雪皑皑");
        
        private final String seasonName;
        private final String seasonDescription;
        
        private Season1(String seasonName, String seasonDescription) {
            this.seasonName = seasonName;
            this.seasonDescription = seasonDescription;
        }
        public void show() {
            System.out.println("This is Season!");
        }
        public String getSeasonName() {
            return seasonName;
        }
    
        public String getSeasonDescription() {
            return seasonDescription;
        }
        @Override
        public String toString() {
            return "Season [seasonName=" + seasonName + ", seasonDescription=" + seasonDescription + "]";
        }
    }

    区别:

    使用enum的时候

    类对象必须放在第一行,分号改成逗号。最后一个对象用分号。并且把原来的

    public static final Season SPRING = new Season("春天", "春意盎然");只留下有背景颜色的部分。

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  • 原文地址:https://www.cnblogs.com/amberbar/p/9882908.html
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