oop

问题 I had an error in a Typescript class method declaration, but I don't understand how the error message relates back to the bug. The message seems to be saying that 'this' is of type any , but we are in a class definition, and so I thought 'this' was really clear. Can someone please explain how the error message relates back to the bug? Original method: calcSize = function() { return this.width * this.length; // Error on this line }; // Error text: 'this' implicitly has type 'any' because it

问题 I had an error in a Typescript class method declaration, but I don't understand how the error message relates back to the bug. The message seems to be saying that 'this' is of type any , but we are in a class definition, and so I thought 'this' was really clear. Can someone please explain how the error message relates back to the bug? Original method: calcSize = function() { return this.width * this.length; // Error on this line }; // Error text: 'this' implicitly has type 'any' because it

问题 I am studying up on my Java Programming and Object Oriented Programming. I keep getting hung up on what the benefit of Dynamic Polymorphism is? Take a look at my sample program below. Why would I use example 1 over example 2? class SuperHero { private String power = ("Generic Power"); public void useSuperPower() { System.out.println(power); } } class Spiderman extends SuperHero { private String power = ("Web sling!"); public void useSuperPower() { System.out.println(power); } } class

问题 I am trying to fetch the Disaster Recovery Backup details of azure recovery vault services like VM's details, disk details etc. using azure recovery services/ azure recovery backup services client(python). There are no proper examples anywhere in the azure documentation in order to use the client effectively. There are some ways in power shell but I am not eager to learn it. I have already tried this but it has no proper examples. I also am able to create RecoveryServicesClient from azure

问题 I am trying to fetch the Disaster Recovery Backup details of azure recovery vault services like VM's details, disk details etc. using azure recovery services/ azure recovery backup services client(python). There are no proper examples anywhere in the azure documentation in order to use the client effectively. There are some ways in power shell but I am not eager to learn it. I have already tried this but it has no proper examples. I also am able to create RecoveryServicesClient from azure

问题 Hi I am facing a design problem which I think it should be quite common: public abstract class Parent { ... public boolean itsOk() { return true; } public void execute() { if (itsOk()){ System.out.println("done"); } } } I need to be able to override itsOK() function in any subclass inherited from 'Parent' even if arguments are different. public class Example extends Parent { public boolean itsOK(int a) { if (a==1) return true; else return false; } } Then when I call execute, I want the

问题 I'm working through this tutorial. I'm working through this iteratively. At this point I have the following Binary class: class Binary: def __init__(self,value): self.value = str(value) if self.value[:2] == '0b': print('a binary!') self.value= int(self.value, base=2) elif self.value[:2] == '0x': print('a hex!') self.value= int(self.value, base=16) else: print(self.value) return int(self.value) I'm running through a suite of tests using pytest, including: def test_binary_init_hex(): binary =

问题 This question already has answers here : Purpose of Default or Defender methods in Java 8 (5 answers) Closed 4 years ago . I am just learning Java, so it is hard for me to access the possible alternatives, and the impact of such a design decision. Java 8 adds the default methods feature to interfaces, which allows interfaces to have an implementation. This allows to extend the existing interfaces with new methods, without breaking the clients, evolving the interface over time in a backward

问题 I have some python program let's say 'Test.py' it has a class and inside this in the init I have to introduce three random variables. import math class Vector(): def __init__(self,vx,vy,vz): self.x=vx self.y=vy self.z=vz def norm(self): xx=self.x**2 yy=self.y**2 zz=self.z**2 return math.sqrt(xx+yy+zz) Now I made a run file 'Testrun.py' which calls this file and then for each dataset it produces one result import math import numpy as np from Desktop import Test def random_range(n, min, max):

问题 Let's say I have a class called Number class Number(): def __init__(self,n): self.n=n self.changed=None a = Number(8) print(a.n) #prints 8 a.n=9 print(a.n) #prints 9 When the n class attribute changes, I want the changed class attribute to be changed to True . 回答1: Possible with proper use of @propety class Number(): def __init__(self,n): self._n=n self._changed=None @property def n(self): return self._n @property def changed(self): return self._changed @n.setter def n(self, val): # while