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Objective-C: difference between id and void *
...ning, not an error. Not only that, you can do this: int i = (int)@"Hello, string!"; and follow up with: printf("Sending to an int: '%s'\n", [i UTF8String]);. It's a warning, not an error (and not exactly recommended, nor portable). But the reason why you can do these things is all basic C.
...
How to get thread id from a thread pool?
...rt java.util.concurrent.*;
class ThreadIdTest {
public static void main(String[] args) {
final int numThreads = 5;
ExecutorService exec = Executors.newFixedThreadPool(numThreads);
for (int i=0; i<10; i++) {
exec.execute(new Runnable() {
public void run() {
...
Android: remove notification from notification bar
...
private static final int MY_NOTIFICATION_ID= 1234; String ns = Context.NOTIFICATION_SERVICE; NotificationManager mNotificationManager; mNotificationManager = (NotificationManager) getSystemService(ns); mNotificationManager.notify(MY_NOTIFICATION_ID, notification); The example...
Find kth smallest element in a binary search tree in Optimum way
...l BST operations take O(depth of node) time, and it takes O(depth of node) extra time to maintain the "number of elements" information for insertion, deletion or rotation of nodes. Therefore, storing information about the number of elements in the left subtree keeps the space and time complexity of ...
Load RSA public key from file
...y.spec.*;
public class PrivateKeyReader {
public static PrivateKey get(String filename)
throws Exception {
byte[] keyBytes = Files.readAllBytes(Paths.get(filename));
PKCS8EncodedKeySpec spec =
new PKCS8EncodedKeySpec(keyBytes);
KeyFactory kf = KeyFactory.getInstance("RSA");...
SQL Query to concatenate column values from multiple rows in Oracle
... ways depending on what version you have - see the oracle documentation on string aggregation techniques. A very common one is to use LISTAGG:
SELECT pid, LISTAGG(Desc, ' ') WITHIN GROUP (ORDER BY seq) AS description
FROM B GROUP BY pid;
Then join to A to pick out the pids you want.
Note: Out of...
Why are there no ++ and -- operators in Python?
...python-iaq.html
It generally encourages people to write less readable code
Extra complexity in the language implementation, which is unnecessary in Python, as already mentioned
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Rails: fields_for with index?
...:namespace] = options[:namespace]
case record_name
when String, Symbol
if nested_attributes_association?(record_name)
return fields_for_with_nested_attributes(record_name, record_object, fields_options, block)
end
else
re...
How does interfaces with construct signatures work?
...le involving interfaces new signatures that does work:
interface ComesFromString {
name: string;
}
interface StringConstructable {
new(n: string): ComesFromString;
}
class MadeFromString implements ComesFromString {
constructor (public name: string) {
console.log('ctor invoked...
How to make a phone call in android and come back to my activity when the call is done?
...tateListener {
@Override
public void onCallStateChanged(int state, String incomingNumber) {
if(TelephonyManager.CALL_STATE_RINGING == state) {
Log.i(LOG_TAG, "RINGING, number: " + incomingNumber);
}
if(TelephonyManager.CALL_STATE_OFFHOOK == state) {
...