JAVA: override interface method

Question

I have interface:

interface operations{  
    void sum();  
}

and I want to have classes:

class matrix implements operations {  
    @override   
    void sum(matrix m) {  
    } 
}

class vector3D implements operations {  
    @override  
    void sum(vecor3D v) {  
    }
}

How to do this? I tried something like this:

interface operations < T > {  
    <T> void sum(T t);  
}

class matrix implements operations<matrix>{
    @Override
    void sum(matrix m){};
    }
}

class vector3D implements operations<vector3D>{
    @Override
    void sum(vector3D v){};
}

but it doesn't work.

Read up about generic methods and how they interact with generic classes. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented May 27, 2014 at 23:50
when implementing operations you must specify which is the actual type i.e. operations<matrix> — enrique7mc
– enrique7mc, Commented May 27, 2014 at 23:53
@Override has an upper-case O. If you use a lower-case o it will be useless. (Or more likely won't compile.) — ajb
– ajb, Commented May 27, 2014 at 23:59

fabian · Accepted Answer · 2014-05-28 00:24:56Z

7

Don't add a type parameters to the interface and the type. Also you should specify the generic parameters of the interface you implement:

interface operations<T> {  
    void sum(T t);  
}



class matrix implements operations<matrix> {  
    @Override   
    public void sum(matrix m){  
    } 
}



class vector3D implements operations<vecor3D> {  
    @Override  
    public void sum(vecor3D v){  
    }
}

edited May 28, 2014 at 0:24

answered May 28, 2014 at 0:12

fabian

82.9k12 gold badges99 silver badges124 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user3308470 Over a year ago

I also noticed missing 'public' before methods

Collectives™ on Stack Overflow

JAVA: override interface method

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related