Enum : Difference between using enum and class with static variables

I have a small question with using enum and using a java class and defining static variables.

For example we can define enum like :-

public enum RequestCodeEnum {

    TRANSACTION(1), REPORTS(2), BUDGET(3), CATEGORY(4), CURRENCY(5);

    private int value;

    private RequestCodeEnum(int value) {
        this.value = value;
    }

    public int getCode(){
        return value;
    }

}

And for the same thing, we can use a java class with static variables like :-

public class ActivityRequestCode {

    public static int TRANSACTION_CODE  = 1;
    public static int REPORTS           = 2;
    public static int BUDGET            = 3;
    public static int CATEGORY          = 4;
    public static int CURRENCY          = 5;

}

And for calling both the classes we can do :-

int i = RequestCodeEnum.CATEGORY.getCode();
int j = ActivityRequestCode.TRANSACTION_CODE;

I want to know what difference it will make or are those the alternative solutions to one another. 7

Thank you.