What is a “Java Bean”? [duplicate]

Any serializable java class (implementing java.io.Serializable) that follows specific conventions: a no-argument constructor, and properties accessible via get/set/is accessors. The idea is to make it predictable, so that properties etc can be discovered automatically through reflection – of great help in tool and framework development.

What does the word “semantic” mean in Computer Science context?

Semantics are the meaning of various elements in the program (or whatever). For example, let’s look at this code: int width, numberOfChildren; Both of these variables are integers. From the compiler’s point of view, they are exactly the same. However, judging by the names, one is the width of something, while the other is a … Read more

What is an example of the Single Responsibility Principle? [closed]

The most effective way to break applications is to create GOD classes. Those are classes that keep track of a lot of information and have several responsibilities. One code change will most likely affect other parts of the class and therefore indirectly all other classes that use it. That in turn leads to an even … Read more

Why class { int i; }; is not fully standard-conformant?

Clause 9 of the standard allows class {public: int i;} (note the lack of a final semicolon) because this decl-specifier-seq for an unnamed class might be used in some other construct such as a typedef or a variable declaration. The problem with class {public: int i;}; (note that the final semicolon is now present) is … Read more

What exactly is NoSQL?

I’m not agree with the answers I’m seeing, although it’s true that NoSQL solutions tends to break the ACID rules, not all are created from that approach. I think first you should define what is a SQL Solution and then you can put the “Not Only” in front of it, that will be more accurate … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)