methods

问题 I have an applet that is communicating with a servlet. I am communicating with the servlet using POST method. My problem is how do I send parameters to the servlet. Using GET method, this is fairly simple ( I just append the parameters to the URL after a ?). But using POST method how do I send the parameters, so that in the servlet side, I can use the statement : message = req.getParameter("msg"); In the applet side, I establish POST method connection as follows : URL url = new URL

问题 I am getting an error when trying to access a search page I have made. The problem seems to be that I am trying to remove blanks when there aren't any there. My search function works, but I am having trouble handling the case when technols is nil. Here is my error: NoMethodError in ProjectsController#search undefined method `[]' for nil:NilClass in my project controller, line 26: tech_ids = params["technols"]["id"].reject(&:blank?). Here is my search action: def search tech_ids = params[

问题 I was going through Programming with Objective-C document provided by Apple. I'm trying to understand the following paragraph, but so far, unable to do so. @protocol XYZPieChartViewDataSource - (NSUInteger)numberOfSegments; - (CGFloat)sizeOfSegmentAtIndex:(NSUInteger)segmentIndex; @optional - (NSString *)titleForSegmentAtIndex:(NSUInteger)segmentIndex; @required - (UIColor *)colorForSegmentAtIndex:(NSUInteger)segmentIndex; @end @interface XYZPieCharView : UIView @property (weak) id

问题 I have a struct , and I have a new method that I have written, that generates the object and return its pointer. Now I also have another method for example, Close , but as of now, it is not mandatory to call this method once the object is created. I want to make sure that this method has to be called if the object is created. How do I do that in Golang? If this is possible, I don't know what is this termed as either. Please help. Thank you. 回答1: There is no way to force the call of a Close()

问题 I have a struct , and I have a new method that I have written, that generates the object and return its pointer. Now I also have another method for example, Close , but as of now, it is not mandatory to call this method once the object is created. I want to make sure that this method has to be called if the object is created. How do I do that in Golang? If this is possible, I don't know what is this termed as either. Please help. Thank you. 回答1: There is no way to force the call of a Close()

问题 What does it mean when their are square brackets in front of double . For example double[] and is there any special way to use the return function when using them in a method. For Example: public double[] MethodName(){ } What is the type of the return value? 回答1: Square brackets [] would indicate an array. In your case of code: public double[] MethodName(){ .... } You have a public method MethodName which returns an array. Double indicates what type the array is, i.e. stores an array of

问题 I have this method in a class class CatList: lista = codecs.open('googlecat.txt', 'r', encoding='utf-8').read() soup = BeautifulSoup(lista) # parse the list through BeautifulSoup def parseList(tag): if tag.name == 'ul': return [parseList(item) for item in tag.findAll('li', recursive=False)] elif tag.name == 'li': if tag.ul is None: return tag.text else: return (tag.contents[0].string.strip(), parseList(tag.ul)) but when I try to call it like this: myCL = CatList() myList = myCL.parseList(myCL

问题 Given a object: struct foo { void func(); }; Now given the templatized function declaration: template<typename T, T F> void bar(); So bar will be taking in a member function like so: bar<decltype(&foo::func), &foo::func>() In the body of bar I want to recover the type foo from T . Can I do that? I want to be able to do something like this: get_obj<T> myfoo; (myfoo.*F)(); I know that get_obj isn't a thing, but would there be a way to write it? 回答1: template<class T> struct get_memfun_class;

问题 User's can comment on a Screen and it's tracked by PublicActivity : @comment.create_activity :create, owner: current_user, recipient: @comment.screen.user and the comments are dependent: :destroy on the screen model. But when i delete a screen, while the comments are deleted, the Record from PublicActivity for that comment still exists. here's my Screens Controller : def destroy @activity = PublicActivity::Activity.find_by_trackable_id(params[:id]) @activity.destroy #<-- Heres the Problem

问题 I am a new-comer in Java and in process of learning. I need a an answer of following question supported with valid theory. Consider the following line- Iterator itr = al.iterator(); where al is some collection object of ArrayList (class) type. I want to know what is here the return type of al.iterator() It is not definitely of a primitive data type, then it could be an object , but since every object belong to a class then it is of which class . Documentation and books etc says it has return