If I understand your question well: by doing test.i = “Hello”, your are modifying its attribute i but your are not “modifying the class” nor its code. Your are simply changing the value of a variable that happens to be an object attribute. So, the class “does not look like that” because it does not … Read more
You have to create an object of your class: class MyClass: def __init__(self,a=1,b=2): self.a=a self.b=b def function1(self): self.c=self.a/self.b + 5 return(self.c) print(MyClass().function1()) MyClass() creates an object that can be used to access attributes in the class. For a general instance: m = MyClass() print(m.function1()) 6 solved Why the method in some class I created, ask … Read more
What this means is that the Manager class extends or implements the Employee class. The second part of your question is a little unclear to me. But an example of having to cast emp is if the Manager class has a specific method which the Employee class does not. You’d need to cast emp in … Read more
change RegistryInterface.doDeleteStudent(studentID); // Static error here. with this.doDeleteStudent(studentID); Hope helped you! solved Non-static methods cannot be referenced from a static context from within the same class [duplicate]
In my point of view I think that you can go more further in term of Single Responsibility Principle(RSP). But I’m not really sure if it relevant to make an interface for Editor. class Image{ string path } Image image = new Image(); interface Rotatory { rotate(image); } class RightRotator implements Rotatory{ rotate(image){ /*Your implementation*/ … Read more
Yes. Assuming the classes remain in the same package – x.getVal will work. class A { String getVal(){ return “from a”; } } class B extends A { } public class C { public static void main(String [] args) { B x = new B(); x.getVal(); } } It works – because of the default … Read more
In insertEnd, you’re guaranteeing you always have None for actualnode at the end of the loop: def insertEnd(self, data): self.size += 1 newnode = Node(data) actualnode = self.head # Keep going until actualnode is None while actualnode is not None: actualnode = actualnode.nextnode # Here actualnode will always be None actualnode.nextnode = newnode To fix … Read more
A few random thoughts. (a) Can you even pin down precisely what it means for a class to have some “responsibility” ??? And subsequently, if (as I suspect) all you have is vague notions without any formally observable / measurable properties / characteristics to pin down the meaning of “responsibility”, then how can you say … Read more
The value of this changes depending upon how the function was invoked; Collection.prototype.onOpen(); // `this` refers to `Collection.prototype` // vs var c = new Collection(); c.onOpen(); // `this` refers to `c` // vs var o = {}; Collection.prototype.onOpen.call(o); // `this` refers to `o` // vs var foo = Collection.prototype.onOpen; foo(); // `this` could be `window` … Read more
You can use the DateTime class to easily manipulate dates. I have put the $dateFormat outside of the method because you could also use that to validate your input in setBirthDate if you saw fit. protected $dateFormat=”m/d/Y”; public function getAge() { // Create a DateTime object from the expected format return DateTime::createFromFormat($this->dateFormat, $this->birthDate) // Compare … Read more
Use self: class MyClass: def __init__(self): self.name=”John” def other_method(self): print(self.name) other_method will print “John”. solved Can you access attributes that were created with the init method from other methods in the class? [closed]
If you want to create an instance, you can just do this c=Chemise() Then call whatever method you want c.Affiche_info() What you’re currently doing is creating another class that inherits from the first solved Object-Oriented Programming / python3 Classes
The dilemma here is that “currently executing object” is a very abstract concept that is easy to intuit but hard to describe in writing (at least for me) If you have a ChildClass, it is also a BaseClass. Therefore, you have a single object in question. Its type is ChildClass, and it can be cast … Read more
Well this is one broken part (unless it’s intentional?) Set the ID property to null this.ID= null; Try to access the property you just set equal to null this.matchName= this.ID.substr(this.ID.lastIndexOf(‘_’)); This code is running in the initialization (constructor) of your Check class and will error out. Here’s what I think you want, with better formatting … Read more
Line 1: You import the express node module that you installed with npm i express and store it in a constant (const). Line 2: You import the function or variable createReadStream from the file system module of node.js (fs module) and make it available for use in this file. Line 3 you assign the express() … Read more