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I would do hashCode() as follows public int hashCode() { String str = this.firstName + " " + this.lastName; return str.hashCode(); } That would satisfy the requirements for hashCode() equal obje …

But the most compelling reason is when you use the class as data entity, those getters and setters might be used by java bean container (EJB, Spring), JPA, XML marshaller and unmarshaller. …

Why not in a static Constant class? I have seen popular framework like SWT putting lot of constants in a constant class if the usage is widespread. And even in the case where the usage is not widespre …

super Manager> the read methods in Pair<> returns generic java Object (ie not type safe for read, the compiler kind of discourages reading in this case) I think seeing it as read and write like this …

Both options are not good in my opinion. Say what if the business logic changes again so that you have another subtype? What I suggest you do is the following: Use a surrogate key for a table call …

From what you have given here, I would make a few addition assumptions and then propose a solution. You have a set of entities which you can uniquely identify You care about the order (in the list) …

I would suggest that you create a configuration class if you use java. Then you can use JAXB to annotate and serialize this class. …

I would do as much in java as possible because of the plethora of ways in which you can log, debug when somethings go wrong. …

Why would you want to use "File Cache"? Caching is supposed to be used when you have some layer with faster accessing ability to reduce time on the slower layers. So if you read files through networ …

Recently some people said that I was wrong when I explained why one cannot insert a Number object into a list declared as List<? super RationalNumber>. (This assumes that RationalNumber is a subclass …

The question is very simple: Do wilcards in Java generics increase flexibility? My understand is "No". Wildcards in Java generics (wilcards) actually decrease flexibility. … Is it therefore true that wildcards in Java actually decrease flexibility? If not, how is my reasoning flawed? …

I would like to propose this answer just in case it can help you some how. In case there are some details or some small errors, please leave comment. I will try to correct. First look at the minimum …

What I would do is this: Group the commands you have into groups. (you have at least 20 right now) At first level, categorize by group, so you have user name related command, song commands, count co …

For hashing operations like the contains() you have above, the worst case complexity is big O of n. This happens when there are n instances with the same hash value and the hashing implementation is c …

From what I understand people often use the factory pattern for this. They put the API interfaces into separate module (say a jar file), and then when the clients want to use the API and has access t …