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问题 I'm trying to make a new CLLocation subclass. This is the skeleton: #import <UIKit/UIKit.h> #import <CoreLocation/CoreLocation.h> @interface JFLocation : CLLocation { } @end #import "JFLocation.h" @implementation JFLocation @end When I build the class I'm getting this errors: Undefined symbols: ".objc_class_name_CLLocation", referenced from: .objc_class_name_JFLocation in JFLocation.o ld: symbol(s) not found Any Idea?? Thank you!! 回答1: You should add CoreLocation.framework to the frameworks

问题 I wanted to create my jars with wars with that should include source file(.java file) parallel to .class file in the generated jar using maven. (I know there are some plugins available to generate a separate xyy-sources.jar file. But I dont want to create a seperate source jar. I need a single jar file with both .class and .java file exists parallel) 回答1: You only have to add resources under build tag. For example. <build> <resources> <resource> <directory>src/main/java</directory> </resource

问题 class MyClassA(object): def __init__(self): entry = input("Insert a value ::: ") b = MyClassB(entry) #To pass the variable entry to class MyClassB c = MyClassC() #Initializied MyClassC to be ready for receive the value p self.x = b.f #To get back the value f from MyClassB print(self.x) self.x1 = c.p #To get back the value f from MyClassC print(self.x1) class MyClassB(object): def __init__(self, M): self.f = M * 10 # f will contain (the value entry from MyClassA *10) c = MyClassC(self.f) #To

问题 I'm a noob to android and i am having an issue calling a method from another class. The method works works fine when called from within its own class, but i get a nullpointerexception when i call it from another class. Any help would be greatly appreciated. Here is my code; Calling method in class1 from class2: BottlesActivity inst = new BottlesActivity(); inst.call0(); Method in class 1: public void call0() { try { Intent callIntent = new Intent(Intent.ACTION_CALL); callIntent.setData(Uri

问题 I would like to use a class Cookie in my namespace for convenience, with the same capabilities as System.Web.Cookie, or better be equivalent. I can't derive from System.Web.Cookie because it is noninheritable... In C, i could simply typedef it to another type, but I don't see any possibility in VB.net other than write a wrapper class that mimics all functions. Is there another way to "rename" a type in VB.net (Framework 4.0)? Edit: I found a solution, to import the class under a different

问题 I need to create a class library in VB.NET that will connect to an Oracle database. I would then be executing some functions to retrieve informations from a database. I would then need to utilize this class in ASP.Net 2.0 project. Would someone care to point me in the right direction in achieving this? Thanks. 回答1: When I had to create a library just for dealing with database for the first time; I wasn't sure how to get started since I didn't know exact terminology to search for. If you

问题 I've been in a bit of a pickle here. I've been ripping my hair out over how to accomplish such a task. For my International Bacc I have to fill out certain criteria for my Program dossier and one of them is using inheritance and passing parameters etc. I'm in the stage of making my prototype and wanted to achieve the effect of using multiple JPanels within the same JFrame. I've achieved this rather crudely with setVisivble() and adding both panels to the JFrame. I understand that I can use

问题 I've got a UL list, each LI has a hidden DIV, and a "More info" link that shows the hidden DIV. However, clicking this button shows all the other LI's hidden DIVs as well. How can I only hide/show the DIV in the LI, and not have all the other hidden DIV's show? And if I click on one how can I hide the others? I'd like to keep this part separate though in case I want to remove it later. Also on click I want the text in the "More info" link to change to "Hide". Here's my current script: $

问题 when i try to addChild my class it says "Cannot access a property or method of a null object reference. at class_obj() at Main()" error #1009 i need to know how to have a class that has a gameloop for testing things like collision and stuff please help! and if i dont have eventlistener enter frame on the object ir works but i need the listener for the loop. Main class package { import flash.display.MovieClip; import flash.events.Event; public class Main extends MovieClip { var mc:class_obj;

问题 Consider a scenario that a java program imports the classes from jar files. If the same class resides in two or more jar files there could be a problem. In such scenarios what is the class that imported by the program? Is it the class with the older timestamp?? What are the practices we can follow to avoid such complications. Edit : This is an example. I have 2 jar files my1.jar and my2.jar. Both the files contain com.mycompany.CrazyWriter 回答1: First, I assume that you mean that the same