methods

问题 I got errors when compiling this: TreeMap <String, Long> myMap = new TreeMap <String, Long>(); //populate the map myMap.put("preload_buffer_size", 1024); myMap.put("net_buffer_length", 1024); //etc... error: no suitable method found for put(String,int) myMap.put("preload_buffer_size", 1024); ^ method TreeMap.put(String,Long) is not applicable (actual argument int cannot be converted to Long by method invocation conversion) method AbstractMap.put(String,Long) is not applicable (actual argument

问题 Visual Studio 2008 C++ Windows Xp SP3 I have created a wxWidgets form (using wxFormBuilder) and have buttons/menus/toolbars all generating events to call various methods (all this works perfectly). Each of these event methods is defined like this: void cLoggingFrame::me_InsertCommentText(wxCommandEvent& event); Now, what I want to be able to do is 're-use' some of these methods by calling them directly. I don't want to generate an event to be handled, I want the method to run when I call it.

问题 In c++ we can easily set up method chaining in a class by designing methods returning *this. Would this be possible in an ATL/COM setting ? Let's say I have a simple ATL class MyOBj. I would like to know if chaining is possible in this context, and if so, what would be the idl signature of the method that would support chaining ? Simple examples would be appreciated ! (In fact, my methods are called from VBA for excel, and I would like to have chaining in that VBA context, as we have chaining

问题 im followinf this guide Sliding Menu using Navdrawer everything was going well until i got errors on getSystemService and getCounterVisability lines in android studio, my adapter class is as follows package com.jembe.locals.adapter; import com.jembe.locals.R; import com.jembe.locals.model.NavDrawerItem; import java.util.ArrayList; import android.app.Activity; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import

问题 I know that Java passes objects by reference, so when an object is passed as an argument into a method, anything that is done locally to the argument inside the method is done to the actual object. void main(){ String[] array1 = {"a","b","c"}; someMethod(array1); print(array1.length); } void someMethod(String[] array){ /..code here../ array = null; } I would expect to get a null pointer exception when trying to print array1.length because my method set it to null. However this is not

问题 When I don't use the "insertBefore" method, it just prints out the linked list normally like it is supposed to. But when I try to use the insertBefore method, it does work for the first part but then it keeps printing the link list as if it goes on forever, ex: without insert before it prints out " my Tests:::: head ->3 -> 2 -> 1 -> 4 -> ||| " But when I use insertBefore and print it out, it prints out head ->3 -> 4 -> 2 -> 1 -> 4 -> 2 -> 1 -> 4 -> 2 -> 1 -> 4 -> 2 -> 1 -> 4 -> 2 -> 1 -> 4 ->

问题 We've never gotten this app to run in production. The application runs just fine in dev. I've made sure all rake tasks are up to date and acts_as_authentic is set for the user and everything else that everyone has posted on all the forums. The server has been bounced multiple times. This error comes up every single time on all URLs. Details below: NoMethodError in User_sessions#new Showing app/views/user_sessions/new.html.erb where line #6 raised: undefined method `username' for #<UserSession

问题 Composition is a useful alternative to inheritance when one wants to cascade method calls from child to parent, see child extended class method calls its super version but that still only sees child data However, for the child to present an interface that is compatible with parent type, one must implement a potentially large number of stub methods that all have the same form, namely they just relay the call to the former parent (which is now a component). My question here, is it possible to

问题 I have two view controllers ( viewControllerA and viewControllerB ) with their own views. When the user touches a button in the view of viewControllerA , I am able to load the view of the viewControllerB . However, I don't know how to invoke a method in viewControllerB 's class! 回答1: Without much info to go on I'll assume that both A & B are of the same class (though they wouldn't have to be). You could always declare a property that would then point from one to the other: MyViewController.h:

问题 I have a rails active record model Application and need to make it read-only. I know that having a before_validation method with: if locked def readonly? true end end Will allow me to make it readonly. The only issue is that, when I need to disable readonly mode, I can not change the locked value to false because the model is already read-only. I know that attr_readonly :name, :email, :price etc. will allow me to make specific attributes readonly, I am looking for the inverse of this to only