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How to create a MySQL hierarchical recursive query
...ditions in this where clause are evaluated in order, and the evaluation is interrupted once the total outcome is certain. Therefore the second condition must be in second place, as it adds the id to the parent list, and this should only happen if the id passes the first condition. The length functio...
Android Spinner : Avoid onItemSelected calls during initialization
... Will call onItemSelected() Listener.
So first time handle this with any Integer value
Example:
Initially Take int check = 0;
public void onItemSelected(AdapterView<?> parent, View arg1, int pos,long id) {
if(++check > 1) {
TextView textView = (TextView) findViewById(R.id.text...
Weighted random numbers
...om number is less than that item's weight
Pseudo-code illustrating this:
int sum_of_weight = 0;
for(int i=0; i<num_choices; i++) {
sum_of_weight += choice_weight[i];
}
int rnd = random(sum_of_weight);
for(int i=0; i<num_choices; i++) {
if(rnd < choice_weight[i])
return i;
rnd -...
How to document a method with parameter(s)?
...ority: The priority of the message, can be a number 1-5
:type priority: integer or None
:return: the message id
:rtype: int
:raises ValueError: if the message_body exceeds 160 characters
:raises TypeError: if the message_body is not a basestring
'''
This markup supports cross-ref...
Automatic Retina images for web sites
...
There's no "good" way to convert in that direction, thus the "where possible". But with the exception of photography sites etc. you're generally going to be creating your art assets so I'd recommend having them done as vectors, which can easily be co...
How can I read input from the console using the Scanner class in Java?
...xample to illustrate how java.util.Scanner works would be reading a single integer from System.in. It's really quite simple.
Scanner sc = new Scanner(System.in);
int i = sc.nextInt();
To retrieve a username I would probably use sc.nextLine().
System.out.println("Enter your username: ");
Scanner ...
Command to get time in milliseconds
... output is:
3010
This is a very cheap operation, which works with shell internals and procfs.
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How to scale threads according to CPU cores?
...al problem with multiple threads in Java. my math problem can be separated into work units, that I want to have solved in several threads.
...
Set Locale programmatically
... displayMetrics = resources.getDisplayMetrics();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1){
configuration.setLocale(locale);
} else{
configuration.locale=locale;
}
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.N){
getApplicationC...
Throw keyword in function's signature
...ly considered a bad idea.
http://www.gotw.ca/publications/mill22.htm goes into a lot more detail about why, but the problem is partly that the compiler is unable to enforce this, so it has to be checked at runtime, which is usually undesirable. And it is not well supported in any case. (MSVC ignore...