factory

问题 i'm just learning java, and i meet some problems. Here we have simple factory pattern: public class SomeFactory { ... public static void registerProduct(String name, Class<? extends IProduct > f) } public SomeProduct implements IProduct { static { SomeFactory.register("some product", SomeProduct.class); } ... } All products should register themselves at factory. But before using this code, all Products classes should be loaded. I can put Class.forName() somewhere, for example in main function

问题 i'm just learning java, and i meet some problems. Here we have simple factory pattern: public class SomeFactory { ... public static void registerProduct(String name, Class<? extends IProduct > f) } public SomeProduct implements IProduct { static { SomeFactory.register("some product", SomeProduct.class); } ... } All products should register themselves at factory. But before using this code, all Products classes should be loaded. I can put Class.forName() somewhere, for example in main function

问题 Sean Parent's talk, Inheritance is the base class of evil, says that polymorphism is not a property of the type, but rather a property of how it is used. As a thumb rule, don't use inheritance to implement interfaces. Among the many benefits of this is the devirtualization of classes which have virtual functions only because they were implementing an interface. Here's an example : class Drawable { public: virtual void draw() = 0; }; class DrawA : public Drawable { public: void draw() override

问题 I'm trying to build a script for import in my future projects. That Script should create some tk.Frames in a tk.Frame and let me edit the created ones in a main . I think, the best way to get there is to create a Holder_frame class and put some nested classes in. so I could call them in my main with Holder_frame.F1. I tried a lot of code and I ended up here making me an account. Anyway here is where Im at: import tkinter as tk from tkinter import Frame,Button class BaseClass(tk.Frame): def _

问题 I want to specify the shape of some data on a subclass and a generator which creates classes with some generic T . My initial thought is to use generics as below (simplified example), but when I call makeMyClass and when I return new classRef , it gives me the following error: Type 'T' is not assignable to type 'DataInterface' Why isn't T of type DataInterface ? class MySuperClass<T> { constructor(public data: T) {} } interface DataInterface { name: string; } let initData: DataInterface = {

来源： https://stackoverflow.com/questions/63802394/aggregation-or-dependency-in-the-simple-factory-uml

问题 I am using the faker.js library to generate random data and I have a couple of factory functions that generate a series of user data: const createUser = () => { return { name: faker.name.findName(), email: faker.internet.email(), address: faker.address.streetAddress(), bio: faker.lorem.sentence(), image: faker.image.avatar(), }; }; const createUsers = (numUsers = 5) => { return Array(numUsers).fill(createUser()); }; let fakeUsers = createUsers(5); console.log(fakeUsers); The problem with this

问题 I am trying to create a linked service in Azure Data Factory using Authentication method as Account Key ,however getting error as : Fail to connect to https://stlptsecurestoragetst.blob.core.windows.net/: Error Message: The remote server returned an error: (403) Forbidden. (ErrorCode: 403, Detail: This request is not authorized to perform this operation., RequestId: 07c79a90-001e-0016-2142-d62fc9000000), make sure the credential provided is valid. The remote server returned an error: (403)

问题 I am trying to create a linked service in Azure Data Factory using Authentication method as Account Key ,however getting error as : Fail to connect to https://stlptsecurestoragetst.blob.core.windows.net/: Error Message: The remote server returned an error: (403) Forbidden. (ErrorCode: 403, Detail: This request is not authorized to perform this operation., RequestId: 07c79a90-001e-0016-2142-d62fc9000000), make sure the credential provided is valid. The remote server returned an error: (403)

问题 I'm currently writing a class factory in TypeScript, and would like to return a type as the output of a function. Although TypeScript handles types as an input--i.e. generics--beautifully, I've not yet found a way to handle types as an output. This StackOverflow question on class factories offered a particularly helpful solution, but did not fully answer my question. Given the below structure, function factory(someVar: any) { return class A { // Do something with someVar that makes this class