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How can I safely encode a string in Java to use as a filename?
... don't want file name collision. Even if user storage areas are segregated by user you may end up with a colliding filename just by filtering out bad characters. The name a user put in is often useful if they ever want to download it too.
For this reason I tend to allow the user to enter what they ...
Python append() vs. + operator on lists, why do these give different results?
... add an array (it's overloaded like others, see this chapter on sequences) by concatenating the element. The append-method however does literally what you ask: append the object on the right-hand side that you give it (the array or any other object), instead of taking its elements.
An alternative
Us...
Getter and Setter declaration in .NET [duplicate]
...s a preferred method (and why). The first one can be generated automaticly by Visual Studio. How about the others ? Thanks
...
What is null in Java?
...ll == null (this isn't always the case in other languages). Note also that by contract, it also has this special property (from java.lang.Object):
public boolean equals(Object obj)
For any non-null reference value x, x.equals(null) should return false.
It is also the default value (for v...
Can a local variable's memory be accessed outside its scope?
... C++ is not going to stop you. Safer languages than C++ solve this problem by restricting your power -- by having much stricter control over keys, for example.
UPDATE
Holy goodness, this answer is getting a lot of attention. (I'm not sure why -- I considered it to be just a "fun" little analogy, b...
How to use arguments from previous command?
...t-3 Alt-Ctrl-y
Press Alt-- 2 Alt-Ctrl-y
Now you will see:
$ echo ace
By the way, you could have put the echo on the line by selecting argument 0:
Press Alt-0 Alt-Ctrl-y
Edit:
To answer the question you added to your original:
You can press Alt-0 then repeatedly press Alt-. to step through ...
What are the differences between Abstract Factory and Factory design patterns?
... with different purposes. But the Abstract Factory is an class/object used by a client and is ONLY responsible for creating some products in a family?
– Hieu Nguyen
Dec 13 '14 at 15:38
...
“register” keyword in C?
...
By this logic const is also be useless since it wins you nothing, you only loose the ability to change a variable. register could be used to make sure nobody takes the address of a variable in the future without thinking. I h...
Access mysql remote database from command line
...ified in the documentation
It will take you to the mysql console directly by switching to the mentioned database.
31-07-2019 - edited syntax
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How does Junit @Rule work?
...execution of the method. This is an example of an out-of-box rule provided by Junit.
Similar behaviour can also be achieved by creating our own rules. Junit provides the TestRule interface, which can be implemented to create our own Junit Rule.
Here is a useful link for reference:
http://www.co...