methods

Im getting fairly confused as the book im reading is delving into the NSNumber class and talks about all the different methods you can call on it. I have a couple questions: 1.) Do you not have to call a typical alloc or init on foundation classes? 2.)in what cases would you use, say, numberWithChar: as opposed to initWithChar (i think this is the part that is messing me up the most, not really sure im groking this concept on the level i need to be, if you folks could break it down for me I think it would really help me get over this humper-roo. Thanks, Nick Class/Instance Analogies Classes

I have lists of data such as a = [1,2,3,4] b = ["a","b","c","d","e"] c = ["001","002","003"] And I want to create new another list that was mixed from all possible case of a,b,c like this d = ["1a001","1a002","1a003",...,"4e003"] Is there any module or method to generate d without write many for loop? Ignacio Vazquez-Abrams [''.join(str(y) for y in x) for x in itertools.product(a, b, c)] This is a little simpler to do if you convert a to be a list of str too. and saves needlessly calling str() on each element of b and c >>> from itertools import product >>> a = [1,2,3,4] >>> b = ["a","b","c",

If either of buttons is pressed, both ApplicationWillResignActive and ApplicationDidEnterBackground methods are being called. I want my application, on its way to the background, to respond differently to these buttons. Can that be done? The problem is only in iOS 5. In previous versions of iOS, only ApplicationWillResigActive was called. Thanks Ariel It seems like the answer is no :( I found this thread: Is it possible to distinguish between locking the device and sending an app to background? And this one: https://devforums.apple.com/thread/119433 来源： https://stackoverflow.com/questions

I want to make a method that takes 1 required parameter and 1 optional parameter, but I found how to make an optional array which is by making in the parameter (int... b) but this is for an array, I want to make it just either this value is null or the user entered it, I can make it by making 2 methods of the same name but one with the single parameter and one with the 2 parameters, but can it be done with just one method? Thanks No, Java doesn't support optional parameters. Another alternative to overloading (which doesn't make much sense for two parameters but does make sense for more) is to

I'm successfully using Soundcloud's widget API, except the setVolume() method is broken :( First, I love the widget, but I'm blown away that after all that amazing work there is no volume control available! People will immediately "back button" out of my site when they hear 100% audio and I can't alter it using setVolume()... I have to get it working or pull it :( Here is what is happening, I have an instance named "widget" (which loads and plays well on the page). widget.bind(SC.Widget.Events.READY, function() { $('#audioIndictments').removeClass('remove'); // This disables a CSS rule, making

Eclipse has an option in Java Compiler tab: Store information about method parameters (usable via reflection) If I checked on the option. I am able to get method parameter via Parameter API. It is good. If I turn on the option, Compiler will stored method parameter information in All my compiling classes. This may make the class/jar file bigger. Eclipse turn it off by default. My question is: Is there any way to turn on the option for some class I want? Is there any compiler directive that I can add it into my java class for this purpose? Thank you! Yes in a way. This is an option to javac

Let's say I have this interface: interface Foo<T extends Foo<T>> { // ... } And the following three classes implementing it: class TrueFoo implements Foo<TrueFoo > { // ... } class FalseFoo implements Foo<FalseFoo> { // ... } class WrongFoo implements Foo<FalseFoo> { // ... } // ^^^^^^^^ this here is wrong, only // Foo<WrongFoo> should be allowed What would the method signature of the following method need to be to enforce that I can return objects of type TrueFoo or FalseFoo, but not WrongFoo... public ???? getFoo(boolean which) { return which ? new TrueFoo() : new FalseFoo(); } The following

I have a super class: public class SuperClass { public void dosomething() { firstMethod(); secondMethod(); } public void firstMethod() { System.out.println("Super first method"); } public void secondMethod() { System.out.println("Super second method"); } } A sub class: public class SubClass extends SuperClass { public void dosomething() { super.dosomething(); } public void firstMethod() { System.out.println("Sub first method"); } public void secondMethod() { System.out.println("Sub second method"); } } A test class： public static void main(String[] args) { SubClass sub = new SubClass(); sub