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Why doesn't Java have any support at all for tail-recursion? I am not sure if there is any difficulty here at all. … by the JVM, since the JVM spec can be changed by the same people who design Java. …

In other words, how Java 8 Stream does sort under the hood? …

Make the old interface deprecated When there is a major overhaul, a new package will most likely be added in (think about the overhaul when Java JDK introduces the new mechanism for file and IO in nio) …

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? …

Short question: Why does Java allow overriding equals(), why is it not final? I am reading Effective Java 2nd edition by Joshua Bloch. … Java makes it possible so Java allows overriding equals() for a reason. …

I have an application where I have a set of core features. The application itself HAS to work in core only mode. I would also want to make the application extensible such that, when certain jar/plug …

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 a software engineering perspective, I believe the proper solution for this kind of problems is in the builder pattern. This is definitely a link from 'guru' authors for your colleague http://en.w …

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 …

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 …

I don't think having a bunch of printlns is a design issue at all. The way I see it is that this can clearly be done with static code analyzer if it is really a problem. But it is not a problem becau …

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 …

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 …

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) …

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 …