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这一段写的感觉有点问题,疑问在最后 #159
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Rule 5. 【推荐】如果变量值仅有有限的可选值,用枚举类来定义常量
尤其是变量还希望带有名称之外的延伸属性时,如下例:
//WRONG
public String MONDAY = "MONDAY";
public int MONDAY_SEQ = 1;
//RIGHT
public enum SeasonEnum {
SPRING(1), SUMMER(2), AUTUMN(3), WINTER(4);
int seq;
SeasonEnum(int seq) { this.seq = seq; }
}
默认的default的访问域是不能跨包的,如果枚举类放在基础包下的话,seq的访问就无法生效了。所以感觉这里写的不够严谨。
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