What these are called, generally, is “variadic functions” (or methods, as it were). To create this, simply end your method declartion with , …, as in – (void)logMessage:(NSString *)message, …; At this point you probably want to wrap it in a printf-like function, as implementing one of those from scratch is trying, at best. – … Read more
NULL values are sorted last in default ascending order. You don’t have to do anything extra. The issue applies to descending order, which is the perfect inverse and thus sorts NULL values on top. PostgreSQL 8.3 introduced NULLS LAST: ORDER BY somevalue DESC NULLS LAST For PostgreSQL 8.2 and older or other RDBMS without this … Read more
Your question is based on assumption that the code which may throw NullPointerException is worse than the code which may not. This assumption is wrong. If you expect that your foobar is never null due to the program logic, it’s much better to use Optional.of(foobar) as you will see a NullPointerException which will indicate that … Read more
Finally, i found out the solution: 1.For device connected: Read device name from gatt characteristic org.bluetooth.characteristic.gap.device_name of service org.bluetooth.service.generic_access. 2.For device no connected: /** * Get device name from ble advertised data */ private LeScanCallback mScanCb = new LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, final int rssi, byte[] scanRecord) { final BleAdvertisedData badata … Read more
In Java, an Optional value is a fusion of a bit that indicates presence or absence, with a value of an arbitrary reference type T or a primitive int, long, or double. Fusing these is especially useful when returning a value from a method, as methods have only a single return value. It’s often necessary … Read more
The behaviour of casting null to an Int depends on the context in which it is done. First of all, if you cast a null to an Int, it actually means a boxed integer, whose value is null. If you put the expression in a context where the expected type is Any (which is translated … Read more
This recursive solution has the virtue of working on even more deeply nested lists. It’s closely modeled on Gabor Grothendieck’s answer to this quite similar question. My modification of that code is needed if the function is to also remove objects like list(NULL) (not the same as NULL), as you are wanting. ## A helper … Read more
If you want to test whether a variable is really NULL, use the identity operator: $user_id === NULL // FALSE == NULL is true, FALSE === NULL is false is_null($user_id) If you want to check whether a variable is not set: !isset($user_id) Or if the variable is not empty, an empty string, zero, ..: empty($user_id) … Read more
You can do the IsNull or NVL stuff, but it’s just going to make the engine do more work. You’ll be calling functions to do column conversions which then have to have the results compared. Use what you have where ((MYCOLUMN=SEARCHVALUE) OR (MYCOLUMN is NULL and SEARCHVALUE is NULL))
When you insert your Extras trying adding .toString() i.putExtra(“Name”, edt_name.getText().toString()); You are seeing the CharSequence value in there but you need to convert it to a String to call getStringExtra(). Obviously, just do this for the Strings. You see the correct value for your int because that is done correctly