黑马程序员技术交流社区

标题: 【上海校区】Java中定义常量(Constant) [打印本页]

---

作者: 不二晨    时间: 2019-1-7 09:43
标题: 【上海校区】Java中定义常量(Constant)

/**
* Method One
*/
interface ConstantInterface {
        String SUNDAY = "SUNDAY";
        String MONDAY = "MONDAY";
        String TUESDAY = "TUESDAY";
        String WEDNESDAY = "WEDNESDAY";
        String THURSDAY = "THURSDAY";
        String FRIDAY = "FRIDAY";
        String SATURDAY = "SATURDAY";
}
/**
* Method Two
*/
enum ConstantEnum {
        SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
}
/**
* Method Three
*/
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";
}
/**
* Method Four
* http://www.ibm.com/developerwork ... nterface/index.html
*/
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()));
        }
}


1.使用Interface

2.使用枚举类型

3.使用static final
---------------------
转载，仅作分享，侵删
作者：qq1010234991
原文：https://blog.csdn.net/qq1010234991/article/details/83020374

---

作者: 不二晨    时间: 2019-1-10 10:26
奈斯，加油

---

欢迎光临 黑马程序员技术交流社区 (http://bbs.itheima.com/)

黑马程序员IT技术论坛 X3.2