Thread: The implementation of a function with generic return type, returns a specific class. Is this a good practice?

Consider the following Class structure

public interface Base {
}
 
public class C1 implements Base {
}
 
 
public interface Repo {
    <T extends Base> T get();
}
 
public class C1Repo implements Repo{
    @Override
    public C1 get() {
        return new C1();
    }
}

Repo interface has a function that returns <T extends Base>, but my implementation returns a specific C1 class.
IntelliJ warns "Unchecked overriding: return type requires unchecked conversion. Found 'org.example.C1', required 'T' ". Is this okay? If not how would I restructure this composition?

The warning from IntelliJ suggests that your code doesn't strictly follow the contract of the Repo interface. While the interface expects a generic return type, your implementation returns a specific class, C1. To fix this, you can modify your implementation to accept a generic return type and return an object of that type. Here's how:
public class C1Repo implements Repo {
@Override
public <T extends Base> T get() {
// Return an object that extends Base
return (T) new C1(); // Casting to T
}
}


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