class

问题 Everything went fine while compiling in debug mode. But while compiling in Release configuration, following error occurs : Error:(28) Error: This class should provide a default constructor (a public constructor with no arguments) (myclassname.HelpDialog) [Instantiatable] This is the code public class HelpDialog extends Dialog { Activity mActivity; Button btn_go_back; public HelpDialog(Activity mactivity) { super(); this.mActivity = mactivity; } @Override protected void onCreate(Bundle

问题 I have a class that has several methods which each have certain properties (in the sense of quality). I'd like these methods to be available in a list inside the class so they can be executed at once. Note that the properties can be interchangeable so this can't be solved by using further classes that would inherit from the original one. In an ideal world it would look something like this: class MyClass: def __init__(): red_rules = set() blue_rules = set() hard_rules = set() soft_rules = set(

问题 I need some help in Nested classes. This has sprung from a question I asked here Essentially I have a class 'myPlugin'. This class is the bulk of my program and includes the 'processReplacing' function. Within processReplacing I need to filter the signal using DSP, currently I am using 11 filters and that has led to 11 filters (and all buffers) being hard coded into processReplacing. However, now I have decided to create a filter class, so I can create a new instance for each filter, call as

问题 I know why I would use a struct as opposed to a class, but how could I best tell which is being used by an API I'm using? Obviously looking at the header file (or hopefully documentation) should make it immediately obvious. I am wondering if there is a way to know if the object I am using is a struct or class on face value though? 回答1: Auto completion in Xcode knows the type of type: 回答2: You can’t inherit from other structures or types. Classes have the ability to inherit functions,

问题 I have a notifyIcon added to my main form of a project. I have other forms in the project that I want to be able to use the notifyIcon though which is proving difficult. What would be the best way to use 1 notifyIcon between multiple forms? I read a thread about not adding it to a form but instantiating it in its own class which made no sense to me. Thoughts? 回答1: Just expose a property on your main form to return a reference to the NotifyIcon. You can even make it static since there is only

问题 I'm developing a C++ program using visual studio 2010. I've these class definitions & header files : s.h : class s : oe { ... }; t.h : class t : oe { ... }; oe.h : class oe { ... o getO();//we reference to class 'o' in oe.h, so we must include o.h begore oe.h }; & o.h : class o { ... s getS();//we reference to class 's' in o.h, so we must include s.h begore o.h }; the problem is that we reference to class 'o' in oe.h , so we must include o.h before oe.h , & also we reference to class 's' in o

问题 How to implement class objects in a header file so every time I include the header file, I can access the object in the cpp file? Here is my code now: //motor-config.cpp #include "core.hpp" #define create_motor_group(x,y...) Motor_Group x ({y}) create_motor_group(fullDrive, frontLeft,rearLeft,frontRight,rearRight); create_motor_group(leftDrive,frontLeft,rearLeft); create_motor_group(rightDrive,frontRight,rearRight); create_motor_group(lift,leftLift,rightLift); create_motor_group(roller

问题 EDIT: See Below I have a web service which uses a class of functions in order to return data used in various business processes (via InfoPath). One of the functions takes a given SQLCommand object and executes it into a SQLDataReader. Now depending on the SQL command text used this may return one or many rows of one or many columns. So what is the best class for this function to return bearing in mind it needs to be serialized by the web service. My existing code is: Dim array As New

问题 I am implementing a graph class using a Map as an adjacency list, with a simple class Vertex that I am using to represent each node in the graph: export class Vertex { constructor(value) { if (value) this.value = value; else throw new Error("Value must be specified"); } getValue() { return this.value; } setValue(value) { if (value) this.value = value; else throw new Error("Value must be specified"); } } Then in my graph class I have implemented a constructor and 2 methods for adding vertices

问题 I'm attempting to make an array of WordCount s, then iterate through a file line by line separating it into tokens using a split method. Then for each token, if it's in wordList , increment count , and if it's not in wordList just simply add it to the list. Hmwk class - public class Hmwk { public static void main(String[] args) throws FileNotFoundException { int n=0; WordCount[] wordList= new WordCount[10000]; Scanner words = new Scanner(new File("input.txt")); while (words.hasNextLine() && n