Call Method from default method in java interface

Question

This may be silly question. but i want to know there is some possibility to do this.

Suppose I have interface like

public interface GroupIdentifier {

    Integer getRevision();
}

And I need another method named as getNextRevision. So what i can do is, implement default method inside same interface and return next number.

EX :

public interface GroupIdentifier {

    //OUTER GET REVISION
    Integer getRevision();

    default GroupIdentifier getNextRevisionIdentifier() {
         return new GroupIdentifier() {
         //INNER GET REVISION
         public Integer getRevision() {
               //Here I want to return OUTER GET REVISION + 1
               return null;
         }
         };
    }
}

Is there some possibility to this.

Answer 1

I have fixed my solution as below.

public interface GroupIdentifier {
    Integer getRevision();

    default GroupIdentifier getNextRevisionIdentifier(GroupIdentifier identifier) {
        return new GroupIdentifier() {
            @Override
            public Integer getRevision() {
                return identifier.getRevision() + 1;
            }
        };
    }
}