Are all statements also expressions? “Wherever JavaScript expects a statement, you can also write an expression. Such a statement is called an expression statement. The reverse does not hold: you cannot write a statement where JavaScript expects an expression. For example, an if statement cannot become the argument of a function.” This is comes from … Read more
Yes, it’s almost the same. The protected modifier specifies that the member can only be accessed within its own package (as with package-private) and, in addition, by a subclass of its class in another package.
A handler is a routine/function/method which is specialized in a certain type of data or focused on certain special tasks. Examples: Event handler – Receives and digests events and signals from the surrounding system (e.g. OS or GUI). Memory handler – Performs certain special tasks on memory. File input handler – A function receiving file … Read more
Declaration Declaration, generally, refers to the introduction of a new name in the program. For example, you can declare a new function by describing it’s “signature”: void xyz(); or declare an incomplete type: class klass; struct ztruct; and last but not least, to declare an object: int x; It is described, in the C++ standard, … Read more
The Wikipedia article Green Threads explains it very well. Green threads are “user-level threads”. They are scheduled by an “ordinary” user-level process, not by the kernel. So they can be used to simulate multi-threading on platforms that don’t provide that capability. In the context of Java specifically, green threads are a thing of the past. … Read more
It doesn’t mean anything in particular in reference to Java. A class invariant is simply a property that holds for all instances of a class, always, no matter what other code does. For example, class X { final Y y = new Y(); } X has the class invariant that there is a y property … Read more
“Headless” in this context simply means without a graphical display. (i.e.: Console based.) Many servers are “headless” and are administered over SSH for example.
I’m totally confused right now – mostly because of the terminology, I guess. Can someone please walk me through the differences, or provide a few links to Dummy-proof material? Especially URI to URL and Resource to File? To me, it feels like they should be the same thing, respectively… The terminology is confusing and sometimes … Read more
What is the difference between them … “Fail-safe” (in engineering) means that something fails in a way that causes no or minimal damage. Strictly speaking, there is no such thing in Java as a fail-safe iterator. If an iterator fails (in the normal sense of “fail”), you can expect damage to occur. I suspect that … Read more
Computer software, and sometimes also other computing-related systems like computer hardware or algorithms, is called Vanilla when not customized from its original form, meaning that it is used without any customizations or updates applied to it. http://en.wikipedia.org/wiki/Vanilla_software