class

问题 Ive been trying out OOP for use with Tkinter - Im getting there (I think) slowly... I wanted to build a structure where each frame is handled by its own class, including all of its widgets and functions. Perhaps I am coming from the wrong angle but that is what makes most logical sense to me. - Feel free to tell me if you agree / disagree! I know why the problem is happening - when im calling each class my __init__ runs everytime and builds the relevant widgets regardless of whether they are

问题 I am creating an object of a class from 2 separate classes and both objects are returning different values for the same method. I suspect it may be an issue with the while loop but here are the classes. The main class works, the setup class is the class that is being turned into and object and the game loop class has the object that doesn't return the right values. it returns the values defined at the beginning of setup and not the modified versions. import java.util.Scanner; public class

问题 This question already has an answer here : Public static variable value (1 answer) Closed 6 years ago . class Constants { public static $url1 = "http=//url1"; public static $url2 = Constants::$url1."/abc2"; public static $url3 = Constants::$url1."/abc3"; public static $url4 = Constants::$url1."/abc4"; } i know this is not possible so should i use it like to have $url1 defination at one place class urlOnly { public static $url1 = "http=//url1"; } class Constants { public static $url1 = urlOnly

问题 This question already has an answer here : Public static variable value (1 answer) Closed 6 years ago . class Constants { public static $url1 = "http=//url1"; public static $url2 = Constants::$url1."/abc2"; public static $url3 = Constants::$url1."/abc3"; public static $url4 = Constants::$url1."/abc4"; } i know this is not possible so should i use it like to have $url1 defination at one place class urlOnly { public static $url1 = "http=//url1"; } class Constants { public static $url1 = urlOnly

问题 My question concerns creating an array of moving objects. The goal is to have each created "symbol" starts at x=200 when created and then moves along the x-axis. This is possible by creating individual objects, though when I try to make them appear in an array they just appear on top of each other (made the balls transparent so you can see them stack). Is there a way to create an array of individual array objects so that this doesn't happen. int numSymbols = 100; int symbolXPos; int i; Symbol

问题 I'm creating a small library for several geometric shapes. Doing so, I'm writing down prototypes into a shapes.h file and the methods into a shapes.cpp file. This is the header: #ifndef __shapeslib #define __shapeslib class Shape{ protected: struct dimensions{ double heigth; double width; }; double radius; // for circle class to be inherited public: Shape(double heigth, double width); // Constructor Shape(const Shape & shape); // copy constructor for class ~Shape(); // Destructor virtual

问题 This question already has answers here : Using an arbitrarily defined method of an anonymous interface (4 answers) Closed 5 years ago . I can imagine some very creative code in Java: Object thing = new Object() { public void speak() { System.out.println("Hi!"); } }; thing.speak(); Or even, to get the full closure effect, define a Function interface ... you get the idea? Why doesn't this code work? 回答1: i believe you can do it like this :- new Object() { public void speak() { System.out

问题 I have the following use case diagram What is the best way to create a class from this diagram? I've tried creating two main classes ( UserManager and ContentManager ) but the whole class structure looks wrong and illogical. Can anyone provide a simple example to help me? [Edit] Below I've pasted my class diagram. What would you change or what do you think about it? 回答1: A Class represents a set of things from the problem domain, not an arbitrary bucket of code. For example, you should have

问题 maybe a simple question but for me as starter with Neo4j a hurdle. I installed the neo4jphp with composer in the same directory as my application. Vendor-Subfolder has been created and the everyman/neo4j folder below is available. For a first test I used this code snippet from the examples: spl_autoload_register(function ($className) { $libPath = 'vendor\\'; $classFile = $className.'.php'; $classPath = $libPath.$classFile; if (file_exists($classPath)) { require($classPath); } }); require(

问题 maybe a simple question but for me as starter with Neo4j a hurdle. I installed the neo4jphp with composer in the same directory as my application. Vendor-Subfolder has been created and the everyman/neo4j folder below is available. For a first test I used this code snippet from the examples: spl_autoload_register(function ($className) { $libPath = 'vendor\\'; $classFile = $className.'.php'; $classPath = $libPath.$classFile; if (file_exists($classPath)) { require($classPath); } }); require(