class

问题 I have added a dependency, and now it conflicts with another library that i am using already. This is the error I am getting after adding the dependecy: Duplicate class com.android.volley.BuildConfig found in modules jetified-volley-1.1.1-runtime.jar (com.android.volley:volley:1.1.1) and jetified-volleyplus-0.1.4-runtime.jar (dev.dworks.libs:volleyplus:0.1.4) I was using 'dev.dworks.libs:volleyplus:0.1.4' , I added 'com.github.Mindinventory:VanillaPlacePicker:0.1.0' . How do I get over it? 来源

问题 I have my student S3 class # a constructor function for the "student" class student <- function(n,a,g) { # we can add our own integrity checks if(g>4 || g<0) stop("GPA must be between 0 and 4") value <- list(name = n, age = a, GPA = g) # class can be set using class() or attr() function attr(value, "class") <- "student" value } I want to define the class groupofstudents : stud1 <- student("name1", 20, 2.5) stud2 <- student("name2", 21, 3.5) groupofstudents <- function(firststud = stud1,

问题 I' trying to make something like this: public interface ICar { public void Update(/*something here*/); } Then two classes: public class Peugeot : ICar { public void Update(Peugeot car) { } } public class Volvo : ICar { public void Update(Volvo car) { } } How can I achieve this? 回答1: You could make ICar generic: public interface ICar<T> where T : ICar<T> { public void Update<T>(T car); } And then implement the Update methods accordingly: public class Peugeot : ICar<Peugeot> { public void

问题 Helo everyone, I'm having big trouble with the declaration of some parameters in a class I defined in a header file I'm using a raspberry pi with C++ and trying to implement some objects through a class. Therefore, I have : my main cpp file where I call the object (it works, I'm sure of that, you'll see) the class cpp file called "Motorcontrol01.cpp" the header file called "Motorcontrol01.h" My code is more complex than what I show here, but I simplified it for tests purpose and it don't work

问题 I am pretty new to python, So I have created a list of elements like: main_list = [1,2,3] I want this list to have a name and I don't want to use a dictionary, so I have created a class with the name as an attribute: class NamedList: def __init__(self, name, obj) self.name = name self.object = obj when I try to access the length of the first list: len(main_list) #works fine but for the second one it gives me this error: NamedList instance has no attribute ' len ' : new_main_list = NamedList(

问题 I'm a Python initiator and I'd like to solve the following problems, but I don't know what the cause is.I approached the problem using 'fsolve' an optimization tool. First of all, I'm trying to solve a nonlinear equation, but I've approached it in two cases. One case worked out well. But I can't find another case. First case (complete case) from sympy import * from scipy.optimize import fsolve import numpy as np y= symbols('y') b_1, b_2 = symbols ('b_1,b_2') b = 1 f = b_1 + b_2*(y/b)**2 K1 =

问题 I have this code in test.py: class Parent(object): def __init__(self): self.myprop1 = "some" self.myprop2 = "thing" def duplicate(self): copy = Parent() copy.myprop1 = self.myprop1 copy.myprop2 = self.myprop2 return copy And this other in test2.py: from test import Parent class Child(Parent): def __str__(self): return "{}, {}".format(self.myprop1, self.myprop2) obj1 = Child() obj2 = obj1.duplicate() obj2.myprop1 = "another" obj2.myprop2 = "stuff" # Accessing properties print("obj1, ", obj1

问题 I am using socket module in python to create two clients and one server. Client_1 shall send content of a .txt file to Client_2, through the server. In server I am using thread module to have a multiple client support. I have created three Threads in my server:- 1) First thread handles the client connections 2) Second thread receives the contents of the .txt file from Client_1 3) Third thread sends this contents to Client_2 The problem that I am facing, while executing the above mentioned

问题 For general classes manipulation understanding; given the following use case : class Child1 def process var 'child1' + var end end class Child2 def process var 'child1' + var end end class Child3 def process var 'child3' + var end end ... class Master attr_reader :var def initialize(var) @var = var end def process [ Child1.new.process(var), Child2.new.process(var), Child3.new.process(var) ] end end by some kind of inheritance or structure, would there be a way to have var available to all

问题 For general classes manipulation understanding; given the following use case : class Child1 def process var 'child1' + var end end class Child2 def process var 'child1' + var end end class Child3 def process var 'child3' + var end end ... class Master attr_reader :var def initialize(var) @var = var end def process [ Child1.new.process(var), Child2.new.process(var), Child3.new.process(var) ] end end by some kind of inheritance or structure, would there be a way to have var available to all