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What is a Java ClassLoader?
In a few simple sentences, what is a Java ClassLoader, when is it used and why?
7 Answers
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Should services always return DTOs, or can they also return domain models?
... MVC controller and vice versa.
Is it ok to adjust domain models based on what services need?
A service just talks to repository and domain methods and domain services, you should solve the business in your domain based on your needs and it's not the service task to tell the domain what is needed....
What is a “surrogate pair” in Java?
...() method. That documentation mentions something about surrogate pairs . What is a surrogate pair in this context? And what are low and high surrogates?
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Group vs role (Any real difference?)
Can anyone tell me, what's the real difference between group and role? I've been trying to figure this out for some time now and the more information I read, the more I get the sense that this is brought up just to confuse people and there is no real difference. Both can do the other's job. I've alw...
Why would you ever implement finalize()?
...hey are eventually released.
If you think you need finalize(), sometimes what you really want is a phantom reference (which in the example given could hold a hard reference to a connection used by its referand, and close it after the phantom reference has been queued). This also has the property t...
What causes a TCP/IP reset (RST) flag to be sent?
... to abort the connection" but that is a little short of the detail I need. What could be causing this? And is it possible that some router along the way is responsible for it or would this always come from the other endpoint?
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What is the reason for performing a double fork when creating a daemon?
...fork and stumbled upon this question here. After a lot of research this is what I figured out. Hopefully it will help clarify things better for anyone who has the same question.
In Unix every process belongs to a group which in turn belongs to a session. Here is the hierarchy…
Session (SID) → ...
More elegant way of declaring multiple variables at the same time
... routine (especially if they really have one-letter names :)
Depending on what you're doing, it may make sense to use a dictionary instead. For example, if you want to set up Boolean preset values for a set of one-letter flags, you could do this:
>>> flags = dict.fromkeys(["a", "b", "c"]...
What is the default access specifier in Java?
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It depends on what the thing is.
Top-level types (that is, classes, enums, interfaces, and annotation types not declared inside another type) are package-private by default. (JLS §6.6.1)
In classes, all members (that means fields, metho...
What does “dereferencing” a pointer mean?
...nd byte in the process's memory, 2 the third, 3 the fourth and so on....
What happened to 0 and the first byte? Well, we'll get to that later - see null pointers below.
For a more accurate definition of what pointers store, and how memory and addresses relate, see "More about memory addresses, an...