Hack123flashchatbanneduser19
In October, the board unanimously declared DePaul “officially” a charter member of the Big East.Q:
Trying to implement mutable subclass of HashMap, getting error “Enum Type mismatch”
I’m making a mutable subclass of the HashMap interface, as per the documentation, I added the following three methods to the interface:
abstract class HackMap extends HashMap{
@Override
public void clear() {
}
@Override
public void put(T key,Object value){
}
@Override
public Object remove(Object key){
}
}
After defining the class, I tried doing the following:
import java.util.*;
public class Demo {
public static void main(String[] args) {
Map map = new HackMap();
map.put(“key”, “value”);
System.out.println(map.get(“key”));
}
}
But I got an error:
java.lang.Error: Unresolved compilation problems:
HackMap cannot be resolved to a type
What is wrong with this code?
Edit:
I put the HackMap.java file at the same level as the class, at which point it compiled.
A:
You can not extend another class like that. In the classes Java tutorial it says
“When it makes sense to extend, or inherit, a class you will find out quickly.”
While the HashMap interface is implemented by the class java.util.HashMap.
To fix your issue, make HackMap a class with methods like clear() and remove(). The method implementations are then implemented by the extended class via the Java language itself.
A:
You need to implement your own methods in HackMap. Take a look at this example.
https://colab.research.google.com/drive/1mww64K-LcE04_-ZRke00iypiFiL0e7FS
https://ello.co/3compnadiae/post/orqfeypnq1moukhluesxsg
https://colab.research.google.com/drive/1C56-FOJsVmiC6KXTEooHtjf9ffUWkgT_
https://documenter.getpostman.com/view/21870114/UzXYssbv
https://documenter.getpostman.com/view/21880513/UzXVrsdT
https://colab.research.google.com/drive/1XASkPgOuSAPODorCTyNZ2B56ndU9l7lJ
https://ello.co/dragtenoja/post/yyt4rqnucnvo9at8j8ipqw
https://ello.co/7amguimei/post/323moqgwwsp5-cysufvfnw
https://ello.co/3sterechguenu/post/heqxl8z7rw8ohkfbnwwedg
https://ello.co/domengia_zu/post/xr12mkgao-ghrmg_fvl7gg
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