methods

问题 I am trying to access a static method, but using a variable as the class name. Is this possible? I seem to be having issues with it. I want to be able to do something like this: class foo { public static function bar() { echo 'test'; } } $variable_class_name = 'foo'; $variable_class_name::bar(); And I want to be able to do similar using static variables as well. 回答1: That syntax is only supported in PHP 5.3 and later. Previous versions don't understand that syntax, hence your parse error ( T

问题 Simple best practice question. Should you nest try catch statements or just use methods. For instance, if you have a method that opens a file does work and closes the file, you would have the open and close outside the try catch, or rather the close in the finally block. Now if your open method fails, the method would assert right? So should your wrap that in a try catch block or should that be called from another method, which in turn as a try catch block? 回答1: In the context of a method

问题 I have searched through to find a simple solution to this problem. I have a method called printCross(int size,char display) It accepts a size and prints an X with the char variable it receives of height and width of size. The calling method printShape(int maxSize, char display) accepts the maximum size of the shape and goes in a loop, sending multiples of 2 to the printCross method until it gets to the maximum. Here is my code but it is not giving me the desired outcome. public static void

问题 I have multiple threads accessing a method. That method updates the progress bar on the form as the threads execute. That method updates the progress bar on my windows form showing the progress of the processed files as the threads are completing them. How would you go about managing that method to avoid deadlocks. Im having trouble locking it, dont know if im doing it wrong, or if i should lock it in this case. public void myWorkerClass() { int amountToScan = 4; lblcount.BeginInvoke( (

问题 I try to use this code ( Update m_set is used inside for loop which goes through few methods which use different type arguments. If I would add for example int.class in getMethod , I would get error after one iteration, because next method would require String.class. Is it possible to solve such problem using reflection?): Method m_set = product.getClass().getMethod(method_name); m_set.invoke(product, method_value); I get this error: Exception in thread "main" java.lang.NoSuchMethodException:

问题 I know in eclipse there is a way to view a object's methods in the sidebar. 回答1: You are referring to the Outline view. It should be displayed by default in the Java perspective (which I assume you are using), but if you don't see it, you can display it from Window->Show View->Outline . 来源： https://stackoverflow.com/questions/26107409/how-to-view-a-objects-methods-in-the-sidebar-in-eclipse

问题 I have two methods. The first one remotely executes an executable and the second one stars talking with an executable. The executable is a web-service. The first step does not return the true (executed through shell) because it starts and waits for the second step. Is there a way to execute the first method and the second method in parallel? 回答1: Use thread. t1 = Thread.new do first_method end second_method t1.join 回答2: Besides the stock threads support I'd like to mention the great Ruby gem

问题 I'm getting stymied by the way "dot notation" works with objects and records when trying to program in a point-free functional style (which I think is a great, concise way to use a functional language that curries by default). Is there an operator or function I'm missing that lets me do something like: (.) object method instead of object.method ? (From what I was reading about the new ? operator, I think it works like this. Except it requires definition and gets into the whole dynamic binding

问题 Can someone help me with this error? NoMethodError in Posts#create Showing C:/Users/User/Documents/website/app/views/posts/_form.html.erb where line #24 raised: undefined method `collect' for nil:NilClass Extracted source (around line #24): 23: <%= f.label :categoria %> 24: <%= f.select :categoria_id, @categoria.collect { |c| [ c.name, c.id ] } %> Trace of template inclusion: app/views/posts/new.html.erb My _form.html.erb <%= form_for(@post, :html => { :multipart => true }) do |f| %> <% if

问题 For example, I have thousands of method like: AA() { ... } BB() { ... } CC() { ... } etc ... Now I want to call a method printCurrentMethodName() on the beginning of each method. That means, AA() { printCurrentMethodName(); ... } BB() { printCurrentMethodName(); ... } CC() { printCurrentMethodName(); ... } etc ... Including printCurrentMethodName() on the start of thousands of method is time consuming. Is there any way that I can call printCurrentMethodName() on the beginning of each methods