大约有 45,000 项符合查询结果（耗时：0.0589秒） [XML]
Clone() vs Copy constructor- which is recommended in java [duplicate]
...
Clone is broken, so dont use it.
THE CLONE METHOD of the Object class
is a somewhat magical method that does
what no pure Java method could ever
do: It produces an identical copy of
its object. It has been present in the
primordial Object s...
Abstract methods in Python [duplicate]
I am having trouble in using inheritance with Python. While the concept seems too easy for me in Java yet up till now I have been unable to understand in Python which is surprising to me at least.
...
What exactly are unmanaged resources?
...nmanaged resources correctly, the garbage collector will eventually handle it for you when the object containing that resource is garbage collected (this is "finalization"). But because the garbage collector doesn't know about the unmanaged resources, it can't tell how badly it needs to release them...
mysqli or PDO - what are the pros and cons? [closed]
In our place we're split between using mysqli and PDO for stuff like prepared statements and transaction support. Some projects use one, some the other. There is little realistic likelihood of us ever moving to another RDBMS.
...
What it the significance of the Javascript constructor property?
...r, the significance of the constructor property, as I can't seem to make it have any effect. E.g.:
6 Answers
...
What is polymorphism, what is it for, and how is it used?
What is polymorphism, what is it for, and how is it used?
28 Answers
28
...
Why is exception handling bad?
...
Exceptions make it really easy to write code where an exception being thrown will break invariants and leave objects in an inconsistent state. They essentially force you to remember that most every statement you make can potentially throw, ...
What does Maven do, in theory and in practice? When is it worth to use it? [closed]
... for practice. I've read about Maven, but I don't actually understand when it is meant to be used.
3 Answers
...
How do you use the ? : (conditional) operator in JavaScript?
Can someone please explain to me in simple words what is the ?: (conditional, "ternary") operator and how to use it?
18 ...
How to access the correct `this` inside a callback?
...his
this (aka "the context") is a special keyword inside each function and its value only depends on how the function was called, not how/when/where it was defined. It is not affected by lexical scopes like other variables (except for arrow functions, see below). Here are some examples:
function foo...