接口 VS 枚举，如何管理常量？

news/2024/11/18 8:37:44/

你平时有哪种方式，管理常量呢？

public static final关键字
接口：管理状态码或配置选项，需要在不同类中共享
枚举：管理有限的常量集合，具有相关的信息提示或描述

1.public static final关键字?

public class Demo{public static fianl String RESULT_YES = "1";public static fianl String RESULT_NO = "0";
}// 实例
public static class DemoServiceImpl{public static void main(String []arg){System.out.println(Demo.RESULT_YES);  // 执行结果：1System.out.println(Demo.RESULT_NO);   // 执行结果：0}}

2.接口?

public class Demo{// public static fianl String RESULT_YES = "1";// public static fianl String RESULT_NO = "0";// 存储上报内容public interface Uplink{String HEARTBEAT = "01";String FLOW = "03";}// 存储反馈的内容public interface Downward{String HEARTBEAT_BACK = "02";String FLOW_BACK = "04";}}// 实例
public static class DemoServiceImpl{public static void main(String []arg){System.out.println(Demo.Uplink.HEARTBEAT);  // 执行结果：01System.out.println(Demo.Uplink.FLOW);   // 执行结果：03System.out.println(Demo.Downward.HEARTBEAT_BACK);  // 执行结果：02System.out.println(Demo.Downward.FLOW_BACK);   // 执行结果：04}}

3.枚举?


public class Demo{public static fianl String RESULT_YES = "1";public static fianl String RESULT_NO = "0";public enum demo{YES(200, "执行成功"), ERROR_500(500, "程序内部执行错误"), ERROR_404(404, "请求超时");private final int code;private final String desc;demo(int code, String desc){this.code = code;this.desc = desc;}public int getCode(){return code;}public String getDesc(){return desc;}}}// 实例
public static class DemoServiceImpl{public static void main(String []arg){int code = demo.YES.getCode();System.out.println(code);String desc = demo.YES.getDesc();System.out.println(desc);}}