大约有 16,000 项符合查询结果(耗时:0.0354秒) [XML]
How to make a countdown timer in Android?
... }
} catch (Exception e) {
e.printStackTrace();
}
}
};
handler.postDelayed(runnable, 0);
}
protected void onStop() {
super.onStop();
handler.removeCallbacks(runnable);
}
}
activity_...
Why git can't remember my passphrase under Windows
...or as instructed by your Git host.
Again, if you have not already done so, convert your key for use with PuTTY's pageant.exe using puttygen.exe. Instructions are in PuTTY's documentation, in this helpful guide, and several other places in cyberspace.
Run PuTTY's pageant.exe, open your .ppk file ("Ad...
What is the best way to check for Internet connectivity using .NET?
What is the fastest and most efficient way to check for Internet connectivity in .NET?
27 Answers
...
How do I automatically scroll to the bottom of a multiline text box?
I have a textbox with the .Multiline property set to true. At regular intervals, I am adding new lines of text to it. I would like the textbox to automatically scroll to the bottom-most entry (the newest one) whenever a new line is added. How do I accomplish this?
...
How to get number of rows using SqlDataReader in C#
...le who try to write their own code to be as generic as possible (usually pointlessly).
– MusiGenesis
Sep 5 '09 at 13:46
5
...
Create an empty data.frame
...ent column types :
df <- data.frame(Doubles=double(),
Ints=integer(),
Factors=factor(),
Logicals=logical(),
Characters=character(),
stringsAsFactors=FALSE)
str(df)
> str(df)
'data.frame': 0 obs. of 5 vari...
Why do we need break after case statements?
...
Just always add a comment along the lines // Intentional fallthrough. when you omit a break. It's not so much a bad style as "easy to forget a break accidentally" in my opinion. P.S. Of course not in simple cases as in the answer itself.
– double...
how does array[100] = {0} set the entire array to 0?
...the elements that don't have a specified value, the compiler initializes pointers to NULL and arithmetic types to zero (and recursively applies this to aggregates).
The behavior of this code in C++ is described in section 8.5.1.7 of the C++ specification (online draft of C++ spec): the compiler ag...
What is tail call optimization?
...earn more about this, I suggest reading the first chapter of Structure and Interpretation of Computer Programs.
– Kyle Cronin
Nov 22 '08 at 16:05
15
...
What's the purpose of using braces (i.e. {}) for a single-line if or loop?
...
Let's attempt to also modify i when we increment j:
int j = 0;
for (int i = 0 ; i < 100 ; ++i)
if (i % 2 == 0)
j++;
i++;
Oh no! Coming from Python, this looks ok, but in fact it isn't, as it's equivalent to:
int j = 0;
for (int i = 0 ; i < 100 ; ++...