Java灵活使用枚举表示一组字符串的操作
Java枚举表示一组字符串
public class HelloWorld { public static void main(String []args) { System.out.println("Hello World!"); System.out.println(Season.SPRING.toString()); System.out.println(Season.SPRING.value()); } } enum Season { SPRING("spring"), SUMMER("summer"), AUTUMN("autumn"), WINTER("winter"); public final String value; private Season(String value) { this.value = value; } public String value() { return this.value; } }
程序输出结果如下:
Hello World!
SPRING
spring
Java枚举类的正确使用
规范使用枚举类
public enum StatEnum { SUCCESS(1,"成功"), FAILD(0,"失败"), REPEAT(-1,"重复"), INNER_ERROR(-2,"系统异常"), DATA_ERROR(-3,"数据异常"); private int state; private String stateInfo; StatEnum(int state, String stateInfo) { this.state = state; this.stateInfo = stateInfo; } public int getState() { return state; } public String getStateInfo() { return stateInfo; } public static StatEnum stateOf(int index){ for(StatEnum state: values()){ if(state.getState() == index){ return state; } } return null; } }
枚举搭配接口一起使用
// 定义接口 public interface CodeEnum { Integer getCode(); String getMessage(); }
// 定义枚举 public enum StatusEnum implements CodeEnum { SUCCESS(0, "成功"), DAILD(1, "失败"); private Integer code; private String message; StatusEnum(Integer code, String message) { this.code = code; this.message = message; } @Override public Integer getCode() { return code; } @Override public String getMessage() { return message; } }
// 定义工具类 public class EnumUtil { public static <T extends CodeEnum> T getByCode(Integer code, Class<T> enumClass) { for (T each: enumClass.getEnumConstants()) { if (code.equals(each.getCode())) { return each; } } return null; } }
使用:
EnumUtil.getByCode(0, StatusEnum.class).getMessage() EnumUtil.getByCode(1, StatusEnum.class).getCode()
以上为个人经验,希望能给大家一个参考,也希望大家多多支持我们。
赞 (0)