How to get value by Java enum class name and field name

Question

How to get value by Java enum class name and field name? The sample code is as follows, but I don't know how to pass the enum class as a parameter.

public enum ErrorCodes1{
    OK(0),
    NOT_EXIST_USER(1),
    FAIL_TO_SEND_MAIL(2),
    ...
}
public enum ErrorCodes2{
    OK(0),
    NOT_EXIST_USER(1),
    FAIL_TO_SEND_MESSA(2),
    ...
}
public void foo1()
{
    foo2(ErrorCodes1.class, "NOT_EXIST_USER");
    foo2(ErrorCodes2.class, "NOT_EXIST_USER");
}

public void foo2(Enum EnumClass, String EnumText)
{
    int code = xxxx; //I want to get code(1) via EnumText and EnumClass, but I don't know how to do it.
}

Answer 1

You can use the type Class as a param of your function foo2

public static void foo2(Class<?> enumClass, String enumText) {
   int code = -1; // I want to get code(1) via EnumText and EnumClass, but I don't know how to do
                        // it.
    switch (enumClass.getCanonicalName()) {
        case "ErrorCodes2": {
            ErrorCodes1 errorCode = ErrorCodes1.valueOf(enumText);
            code = errorCode.ordinal();
        }
        case "ErrorCodes1": {
            ErrorCodes1 errorCode = ErrorCodes1.valueOf(enumText);
            code = errorCode.ordinal();
        }
    }
    System.out.println(code);
}

After that, you can use valueOf to instantiate your enum from a string that contains the enum value. I don't think this is the best solution but its works.

PS: The param of a function begins with a lowercase letter.