Generics and Dynamic Instantiation Problem

Can anyone help me to fix the code in the Main so that is works as intended?
Gurus will know what I'm after.
TIA :cool:

Please see below:

Code Java:

---

public abstract class MyBaseElement 
{...}
 
public class MyElementA extends MyBaseElement
{...}
 
public class MyElementB extends MyBaseElement
{...}
 
public class MyElementC extends MyBaseElement
{...}
 
public interface Mapper<T>
{...}
 
public class MyMapperA implements MyMapper<MyElementA>
{...}
 
public class MyMapperB implements MyMapper<MyElementB>
{...}
 
public class MyMapperC implements MyMapper<MyElementC>
{...}

---

// this method returns an instance of
// one of the child classes: MyElementA, MyElementB, MyElementC, etc...

Code Java:

---

public MyBaseElement getSpecificElement() {...}

---

// this method returns a specific mapper based on the element

Code Java:

---

public Mapper<? extends MyBaseElement> getSpecificMapper(MyBaseElement element)
{
    if (element instanceof MyElementA) return new MyMapperA;
    if (element instanceof MyElementB) return new MyMapperB;
    if (element instanceof MyElementC) return new MyMapperC;
    ...
}

---

Code Java:

---

// Main
 
...
 
MyBaseElement element = getSpecificElement();
 
// the line below compile
Class<? extends MyBaseElement> myElement = element ;
 
//the line below does not compile: can not convert from MyBaseElement to Mapper<? extends MyBaseElement>
// Any ideas, please?
Mapper<? extends MyBaseElement> myMapper = getSpecificMapper(myElement ) 
 
myMapper.doStuff();
 
...
 
// end-Main

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Quote:

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Originally Posted by marcosmarcos

Can anyone help me to fix the code in the Main so that is works as intended?
Gurus will know what I'm after.

---

I have no idea what you are after.

Firstly I would recommend posting something we can compile.
Secondly, please give us an indepth description of your problem.

I agree with JavaPF here, somewhat confusion this.

However, I'm not sure this will work, into the method getSpecificMapper you're passing in a Class<? extends MyBaseElement> but in the method signature it takes a MyBaseElement, not a Class.

// Json