Java interface extending an abstract class?

Question

I am posting a code snippet that does not give any syntax error when an interface extends and abstract class. The interface audio extends abstract class music in the method sort()

import java.util.List;
abstract class music {}
public interface audio {}

abstract class play implements Comparable <play> {

    public <audio extends music> void sort (List <music> list){
        //do something 
    }

}

I am assuming an interface CAN NOT extend an abstract class. Can any one explain why it is so?

Andy Thomas · Accepted Answer · 2013-05-25 04:19:33Z

5

In your example, the second "audio" is not the interface, but a type parameter to your generic method. You could just as well name it T.

answered May 25, 2013 at 4:19

Andy Thomas

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johnchen902 · Accepted Answer · 2013-05-25 04:19:30Z

2

You misunderstand. Your type parameter audio is hiding the interface audio.

public <T extends music> void sort(List<music> list) {
    // do something
}

answered May 25, 2013 at 4:19

johnchen902

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