subclass

问题 About this problem my previous question is that. How to Access Multiple Classes data in One MainClass? Now to make my problem more clear i provide source code here SourceCode. As my source Code show i declare all the classes in my mainclass and my coding is in my mainclass.But i want to place all my mainclass code to its related class that i create in my application.For Exp Code related to first Class i want to place all there and Code related to Second Class place in Second Class.Now problem

问题 Is it possible to make a user defined type be a virtual subclass of a built in type in python? I would like my class to be considered a subclass of int , however I don't want to inherit directly like this: class MyInt(int): '''Do some stuff kind of like an int, but not exactly''' pass Since then my class becomes effectively immutable, whether I want it to be or not. For instance, it becomes impossible to use methods like __iadd__ and __isub__ since int has no way to modify itself. I could

问题 Okay, so this is somewhat related to my previous question on the ColorMatrixColorFilter, but I feel it's a significantly different question. I'm wondering if there's a way - or rather, how to extend the ColorFilter class to create my own custom color filter. For what I'm needing to accomplish, I need to write a custom filter that will query each pixel, convert its RGB value to HSL or LAB, modify the hue, convert it back to RGB, and set that pixel to the new value. I'm thinking I could simply

问题 I am currently making a text based adventure in Java for the purposes of using it a test platform, to try out new things I learn from this Java book I'm reading. I am now trying to declare an instance of a subclass (as the player is scripted to find it). The parent class is Item and it has two subclasses: Weapon and Armour . However, no matter which way I try and declare it in, the IDE I'm using (Eclipse) flags the line with the following error: No enclosing instance of type Item is

问题 I am currently making a text based adventure in Java for the purposes of using it a test platform, to try out new things I learn from this Java book I'm reading. I am now trying to declare an instance of a subclass (as the player is scripted to find it). The parent class is Item and it has two subclasses: Weapon and Armour . However, no matter which way I try and declare it in, the IDE I'm using (Eclipse) flags the line with the following error: No enclosing instance of type Item is

问题 I have a generic list class that implements a particular interface. The list items in the interface also implement the same interface. public abstract class List<T extends SomeInterface> implements SomeInterface { protected LinkedList<T> m_list; ... } So now I want to make a subclass of this list that stays generic but limits the items to objects that implement the SearchListItem interface: public interface SearchListItem { public String getName(); } Here's what I have for the SearchList

问题 I know that if I have multiple instance of the same class all of them are gonna share the same class variables, so the static properties of the class will use a fixed amount of memory no matter how many instance of the class I have. My question is: If I have a couple subclasses inheriting some static field from their superclass, will they share the class variables or not? And if not, what is the best practice/pattern to make sure they share the same class variables? 回答1: If I have a couple

问题 I know that if I have multiple instance of the same class all of them are gonna share the same class variables, so the static properties of the class will use a fixed amount of memory no matter how many instance of the class I have. My question is: If I have a couple subclasses inheriting some static field from their superclass, will they share the class variables or not? And if not, what is the best practice/pattern to make sure they share the same class variables? 回答1: If I have a couple

问题 I want to subclass the list type and have slicing return an object of the descendant type, however it is returning a list . What is the minimum code way to do this? If there isn't a neat way to do it, I'll just include a list internally which is slightly more messy, but not unreasonable. My code so far: class Channel(list): sample_rate = 0 def __init__(self, sample_rate, label=u"", data=[]): list.__init__(self,data) self.sample_rate = sample_rate self.label = label @property def nyquist_rate

问题 class BaseDoc { static Collection; static find(){ // which is expected to return an instance of SubDoc when run SubDoc.find() return this.Collection.find(); } } class SubDoc extends BaseDoc {} What I hope is: When running SubDoc.find(), the app knows the type of the return value to be an instance of SubDoc rather than BaseDoc. How can I achieve that? 回答1: You can create a generic version of find that will have the this parameter inferred to the type of the class it's being called on, and use