How to override a generic method

Question

Generic method :

public <T> void foo(T t);

Desired overridden method :

public void foo(MyType t);

What is the java syntax to achieve this?

Is T constrained by the class? As in, is the method enclosed in some generic `class Example { }` — Upio, Sep 04 '14 at 09:35

score 2 · Answer 1 · edited May 23 '17 at 10:28

2

You might want to do something like this :

abstract class Parent {

    public abstract <T extends Object> void foo(T t);

}

public class Implementor extends Parent {

    @Override
    public <MyType> void foo(MyType t) {

    }
}

A similar question was answered here as well : Java generic method inheritance and override rules

edited May 23 '17 at 10:28

Community

1
1

answered Sep 04 '14 at 09:36

Snehal Masne

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Do you understand that `MyType` here is generic parameter name, not name of existing class? – talex Sep 04 '14 at 09:41

score 2 · Accepted Answer · answered Sep 04 '14 at 09:37

2

A better design is.

interface Generic<T> {
    void foo(T t);
}

class Impl implements Generic<MyType> {
    @Override
    public void foo(MyType t) { }
}

answered Sep 04 '14 at 09:37

Upio

1,364
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score 0 · Answer 3 · answered Sep 04 '14 at 09:28

0

interface Base {
    public <T> void foo(T t);
}

class Derived implements Base {
    public <T> void foo(T t){

    }
}

answered Sep 04 '14 at 09:28

talex

17,973
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Do you think is this related here ? – Vinay Veluri Sep 04 '14 at 09:29
Probably he wants to have specific implementation in overriden method. – Snehal Masne Sep 04 '14 at 09:38
@Snehal Masne of course he can put any implementation inside. – talex Sep 04 '14 at 09:42
I think it would be more helpful for the OP and further visitors, when you add some explaination to your intension (in example: how does your code work). – Reporter Sep 04 '14 at 10:01
@reporter Isn't it obvious – talex Sep 04 '14 at 10:05

How to override a generic method

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