使用枚举代替常量

public enum SumtypeEnum {
    DEFALUT("",""),
    SUM("sum","求和"),
    MAX("max","最大值"),
    MIN("min","最小值");
    String mStatus;
    String mDesc;
    SumtypeEnum(String status,String desc){
        mStatus=status;
        mDesc=desc;
    }
    
    public static SumtypeEnum getsumtypeEnum(String status) {
        for(SumtypeEnum sum:values()) {
            if(status==sum.mStatus) {
                return sum;
            }
        }
        return DEFALUT;
    }
}

public class EnumTest {
    public static void main(String[] args) {
        SumtypeEnum sum=SumtypeEnum.getsumtypeEnum("sum");
        System.out.println(sum.mDesc);

        //输出 "求和"
    }
}