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如何让在JAVA中定义常量池
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首先看示例：
interface?ConstantInterface?{??????String?SUNDAY?=?"SUNDAY";??????String?MONDAY?=?"MONDAY";??????String?TUESDAY?=?"TUESDAY";??????String?WEDNESDAY?=?"WEDNESDAY";??????String?THURSDAY?=?"THURSDAY";??????String?FRIDAY?=?"FRIDAY";??????String?SATURDAY?=?"SATURDAY";??}??enum?ConstantEnum?{??????SUNDAY,?MONDAY,?TUESDAY,?WEDNESDAY,?THURSDAY,?FRIDAY,?SATURDAY??}??class?ConstantClassField?{??????public?static?final?String?SUNDAY?=?"SUNDAY";??????public?static?final?String?MONDAY?=?"MONDAY";??????public?static?final?String?TUESDAY?=?"TUESDAY";??????public?static?final?String?WEDNESDAY?=?"WEDNESDAY";??????public?static?final?String?THURSDAY?=?"THURSDAY";??????public?static?final?String?FRIDAY?=?"FRIDAY";??????public?static?final?String?SATURDAY?=?"SATURDAY";??}??class?ConstantClassFunction?{??????private?static?final?String?SUNDAY?=?"SUNDAY";??????private?static?final?String?MONDAY?=?"MONDAY";??????private?static?final?String?TUESDAY?=?"TUESDAY";??????private?static?final?String?WEDNESDAY?=?"WEDNESDAY";??????private?static?final?String?THURSDAY?=?"THURSDAY";??????private?static?final?String?FRIDAY?=?"FRIDAY";??????private?static?final?String?SATURDAY?=?"SATURDAY";??????public?static?String?getSunday()?{??????????return?SUNDAY;??????}??????public?static?String?getMonday()?{??????????return?MONDAY;??????}??????public?static?String?getTuesday()?{??????????return?TUESDAY;??????}??????public?static?String?getWednesday()?{??????????return?WEDNESDAY;??????}??????public?static?String?getThursday()?{??????????return?THURSDAY;??????}??????public?static?String?getFirday()?{??????????return?FRIDAY;??????}??????public?static?String?getSaturday()?{??????????return?SATURDAY;??????}??}??public?class?TestConstant?{??????static?final?String?day?=?"saturday";??????public?static?void?main(String[]?args)?{??????????System.out.println("Is?today?Saturday?");??????????System.out.println(day.equalsIgnoreCase(ConstantInterface.SATURDAY));??????????System.out.println(day.equalsIgnoreCase(ConstantEnum.SATURDAY.name()));??????????System.out.println(day.equalsIgnoreCase(ConstantClassField.SATURDAY));??????????System.out.println(day.equalsIgnoreCase(ConstantClassFunction??????????????????.getSaturday()));??????}??}?? ?
方法一采用接口(Interface)的中變量默認(rèn)為static final的特性。
方法二采用了Java 5.0中引入的Enum類型。
方法三采用了在普通類中使用static final修飾變量的方法。
方法四類似方法三，但是通過函數(shù)來獲取常量。
首先定義全局變量似乎有違Java的面向?qū)ο蟮姆庋b特性，增加的耦合。所以最佳的方法是避免定義全局變量。如果是參數(shù)等，可以寫入配置文件。如果實(shí)在是必須的，方法二是最為推薦的。方法三是大家都能想到的，非常的直觀。方法一和方法三本質(zhì)上一樣。方法四提供了靈活性，具體參考引用【1】。
轉(zhuǎn)載于:https://www.cnblogs.com/architects/p/4552412.html
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