instance

问题 Is there any way to create dynamically an extended anonymous instance given another one? Would be something like this, and I think it would be great. File myFile = new File("notes.txt"); new FileWrapper extends myFile(){ //instance!!! @Override public boolean equals(File in){ return false;} }; This is like copying the object instance and rewritting the logic inside a particular method If not whats the best way of achieving it? Note: I know that the example is valid if myFile is a class´s name

问题 I am a newbie, and I am wondering what an instance of NSObject is. I am working on Xcode 3.2 and want to know what the instance is. I've heard this term often and am confused by it. 回答1: From Wikipedia on Objects in OOP Objects in "object-oriented programming" basically are data structures combined with the associated processing routines. For instance, a file is an object: a collection of data and the associated read and write routines. Objects are considered instantiations of classes. In

问题 My app has login, once the access is granted, it creates a new html file to the sdcard, the output or the appearance of that html file depends on the account of the logger. After writing, the app goes to the next activity Intent nextActivity = new Intent(MyMainAct.this, AppView.class); startActivity(nextActivity); the AppView class is the next activity in which the UI is a webview. It views the html created on login. When I click "login as different user" button, I go back to the Main

问题 I have the error "unreported exception AWTException ; must be caught or declared to be thrown" instantiating a class that contain methods with mouse and key movements using Robot. I tried with try catch In the instance but the "click" doesnt work this way, what is the problem how to solve it? package Ventanas; enter code here import java.awt.AWTException; import java.awt.Robot; import java.awt.event.InputEvent; public class Sel { Robot robot = new Robot(); public void apos() throws

问题 I made a Stock Tiker to display continuous stock objects. And Working fine for first Instance. The implementation of the ticket code is as follows: - (void)viewDidLoad { tickerView=[[StockTiker alloc] init]; [tickerView setFrame:CGRectMake(0, 0, 320, 20)]; tickerView.delegate=self; UILabel *label=[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 150, 20)]; [label setBackgroundColor:[UIColor redColor]]; label.text=@"First Object"; UILabel *label2=[[UILabel alloc] initWithFrame:CGRectMake(0, 0,

问题 I just watched a youtube tutorial called "many methods and instances". He made a program in which you enter something and it says "your first gf was _ ". But it was way too overcomplicated. First is the main class: import java.util.Scanner; public class MethodsInstances2 { public static void main(String args[]) { Scanner input = new Scanner(System.in); MethodsInstances object = new MethodsInstances(); System.out.println("Enter name of first gf here: "); String temp = input.nextLine(); object

问题 I understand that PHP doesn't allow me to create a new instance of ClassB inside my ClassA, if the creation is not inside the scope of a function. Or I just don't understand... class ClassA { const ASD = 0; protected $_asd = array(); //and so on protected $_myVar = new ClassB(); // here I get *syntax error, unexpected 'new'* underlining 'new' // functions and so on } Do I need some kind of constructor, or is there a way to actually create the object instance in a free way as I desire, as I am

问题 example image Very new to AS3. Sorry if this question is really basic, I tried looking around for the right answer but only found semi-related questions. Please help!! Objective: I want multiple rollover MovieClips on the same stage that play out their animations independently. So far, I have only 1 MovieClip object that behaves properly. If I add another, the first one behaves properly but the second doesn't appear at all. I understand that it's probably only calling the instance that I

问题 Help, I'm deperate..i can't continue my app because of this: I have setup one message between 2 of my cocoa objective-c clases, the main appdelegate is messaging a view through NSNotificationCenter the view receives indeed the notification but somehow it can't update the controls visible on the view.. it's like it can't find the proper instance or something. here's my code: mainapp (where the appdelegate messages my view): helloKey = @"0"; helloString = @"mymessage"; values =

问题 I know that Python guarantees that there is only one instance of NoneType , the None object, so that you can safely use is None to test if something equals None . Is there an equivalent guarantee for bool True and False (i.e. that there is only one instance of each)? If not, why not? EDIT: In particular, I've noticed that (n+0) is (0+n) gives True for n in range(-5, 257) and False otherwise. In other words, zero, the first 256 positive and the first 5 negative integers seem to be pre-cached