Questions tagged [extends]
extends is a keyword in several programming languages used to denote implementation inheritance
extends
1,714
questions
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2
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48
views
How to upgrade Java class to extension class?
I have a simple problem. I have a large class:
public class Base {
public Field1Data field1;
public Field2Data field2;
public Field3Data field3;
// many more fields later...
public ...
- 183
1
vote
1
answer
61
views
Extending the object type of a function argument
I want to extend the function argument type by adding a function with any name to each object and return it, but i am facing a problem with naming the key of the added function
export type Expand<...
2
votes
1
answer
63
views
Why can't TypeScript override a method of the parent class with a derived type?
Here is a simple example.
type Callback<T> = (sender: T) => void;
class Garage<T> {
private callbacks: Callback<T>[];
public constructor(callbacks: Callback<T>[]) ...
- 77
1
vote
1
answer
33
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In TypeScript why does [1, 2] extend [...unknown[], 0, ...unknown[]]?
I'm trying to understand how infer in TypeScript conditional types work. One thing I've noticed about infer types in TypeScript is that they are defined to allow a rest element following another rest ...
- 1,146
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vote
0
answers
60
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Class extends value undefined is not a constructor or null [vite build]
When I run the build of my Vite project I have this error
Class extends value undefined is not a constructor or null
migrating from CRA to vite
I have tried to place some keys on vite.config.js
my ...
1
vote
0
answers
64
views
PHP Extends through includes doesn't work with parent in file2 / child in file1
So i was making a basic code and came across this problem.
I first had all my code in one file, afterwards i split the different classes into individual files.
While doing that i was doing that i had ...
- 11
1
vote
0
answers
52
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Using java super and exends with lambda expressions [duplicate]
I am fairly new to Java, currently learning about lambda expressions.
so I wanted to use generic with the Consumer function to make it accept any type of parameter passed to it and just print it out
...
2
votes
2
answers
49
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How to implement Array-Like class in TypeScript? [duplicate]
I would like to create an Array-Like class and add some properties to it. So far I have this code:
class MyArray<T> extends Array<T> {
constructor(items: T[], data?: any) {
...
- 125
0
votes
0
answers
44
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How do I add value to my Method call from my Sub class to Main?
The string value seems to appear yet I can not add a value to my calculations in the fulltime and part time.
This is the Main class for my inheritance
import java.util.Scanner;
public class ...
- 1
-2
votes
1
answer
39
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Why do Exception classes that extend the base Java Exception class not get caught?
Given the following program:
public class App {
public static void main(String[] args) throws Exception {
int x = 0;
try {
throw new Exception2();
}
...
- 9
0
votes
1
answer
173
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AHK V2 Class extends troubles
I'm not sure if I'm using classes wrong, but any assistance would be appreciated. I'm using Autohotkey V2 and I'm trying to make a class extend to another class.
Class Person{
__New(info){
this....
- 11
1
vote
2
answers
34
views
typescript: the method Status will be undefined during extends MemoryStream
If I remove the extends MemoryStream below, then everything works as expected - the status method can be called.
But if I use extends MemoryStream, then the status method becomes undefined.
What am I ...
- 1,533
1
vote
1
answer
107
views
Use case extends or include [duplicate]
I have 3 actors: User A, User B and Admin and the use case view photo that is linked with each actors. Now, I want to add a use case add to favourites, and this use case can be activated only by User ...
- 37
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0
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67
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java se 8 rules for implementing abstract methods from extended interfaces
why does this code compile printing "Class 2" (java se8; eclipse) even if abstract method is NOT implemented in first concrete class?
IDE gives me the hint: The type Class1 must implement ...
- 11
0
votes
1
answer
151
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Is it possible to inherit multiple classes? [duplicate]
I was studying for my Intro to Java I exam and I don't think I need to get this far into inheritance but it made me curious. I decided to practice with Pokémon because even though most of the examples ...
