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What is the purpose of flush() in Java streams?
...on of the output stream, such bytes should immediately be written to their intended destination.
The buffering is mainly done to improve the I/O performance. More on this can be read from this article: Tuning Java I/O Performance.
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How to prevent going back to the previous activity?
...eed through of the previous activity. e.g., if you have HomeActivity -> IntermediateActivity -> FinalActivity, and you call finish() in the IntermediateActivity immediately after starting the FinalActivity you'll see the HomeActivity for a brief moment.
– David Murdoch
...
What is an invariant?
...e. A function or method that ensures that the invariant holds is said to maintain the invariant.
For instance, a binary search tree might have the invariant that for every node, the key of the node's left child is less than the node's own key. A correctly written insertion function for this tree wi...
Sql Server 'Saving changes is not permitted' error ► Prevent saving changes that require table re-cr
...save it, if I try to edit the table design, like change a column type from int to real, I get this error:
16 Answers
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Python string class like StringBuilder in C#?
...
It is not a premature optimization to avoid fragile, interpreter-dependant optimizations. If you ever want to port to PyPy or risk hitting one of the many subtle failure cases for the optimization, do things the right way.
– Veedrac
Nov 3 ...
Why are flag enums usually defined with hexadecimal values
...ively low-level topics where the memory layout of data matters. Using it hints at the fact that that's the situation we're in now.
Also, i'm not sure about C#, but I know that in C x << y is a valid compile-time constant.
Using bit shifts seems the most clear:
[Flags]
public enum MyEnum
{
...
Copy entire contents of a directory to another using php
... path
* @param string $dest Destination path
* @param int $permissions New folder creation permissions
* @return bool Returns true on success, false on failure
*/
function xcopy($source, $dest, $permissions = 0755)
{
$sourceHash = hashDirectory($source);
...
Long-lasting FB access-token for server to pull FB page info
...ist
Click "Get Access Token"
Make sure you add the manage_pages permission
Convert this short-lived access token into a long-lived one by making this Graph API call:
https://graph.facebook.com/oauth/access_token?client_id=<your FB App ID >&client_secret=<your FB App secret>&grant...
Is there a label/goto in Python?
...d do with a goto using first class functions. For example:
void somefunc(int a)
{
if (a == 1)
goto label1;
if (a == 2)
goto label2;
label1:
...
label2:
...
}
Could be done in python like this:
def func1():
...
def func2():
...
funcmap =...
How to load an ImageView by URL in Android? [closed]
...droid_icon_256.png");
public void onClick(View v) {
startActivity(new Intent(this, IndexActivity.class));
finish();
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmIm...