... If we wish to access a member specific to a particular subclass, we must cast down to that subclass first: // Say ImplementingClass also contains uniqueMethod() // To access it, we use a cast to tell the runtime which type the object is AbstractClass b = new ImplementingClass(); ((ImplementingCla...

I wrote an Android application. Now, I want to make the device vibrate when a certain action occurs. How can I do this? 13 ...

...s try to access the same resource at the same time. One process loses out and must wait for the other to finish. A deadlock occurs when the waiting process is still holding on to another resource that the first needs before it can finish. So, an example: Resource A and resource B are used by pro...

...ry distribution. In any case, using MANIFEST.in will work both for binary and for source distributions. share | improve this answer | follow | ...

... Error starting at line 1 in command: select * from FROM v$session Error at Command Line:1 Column:14 Error report: SQL Error: ORA-00903: invalid table name 00903. 00000 - "invalid table name" *Cause: *Action: – pistacchio ...

My application installs other applications, and it needs to keep track of what applications it has installed. Of course, this could be achieved by simply keeping a list of installed applications. But this should not be necessary! It should be the responsibility of the PackageManager to maintain the ...

I'm just beginning to have a look at Objective-C and Cocoa with a view to playing with the iPhone SDK. I'm reasonably comfortable with C's malloc and free concept, but Cocoa's references counting scheme has me rather confused. I'm told it's very elegant once you understand it, but I'm just not o...

I created some custom elements, and I want to programmatically place them to the upper right corner ( n pixels from the top edge and m pixels from the right edge). Therefore I need to get the screen width and screen height and then set position: ...

... unicode is meant to handle text. Text is a sequence of code points which may be bigger than a single byte. Text can be encoded in a specific encoding to represent the text as raw bytes(e.g. utf-8, latin-1...). Note that unicode is not encoded! T...

...d not using images2gif from visvis because it has problems with PIL/Pillow and is not actively maintained (I should know, because I am the author). Instead, please use imageio, which was developed to solve this problem and more, and is intended to stay. Quick and dirty solution: import imageio im...