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public interface IndexedObject {public String toString();}

class RomanIndexedObject implements IndexedObject {
private int _i;
private Object _o;
RomanIndexedObject(int i, Object o) { _i = i; _o = o; }
public String toString() {
return indexToString() + _o.toString();
}
private String indexToString() {
return Util.toRoman(_i);
}
}

class LetterIndexedObject implements IndexedObject {
private int _i;
private Object _o;
LetterIndexedObject(int i, Object o) { _i = i; _o = o; }
public String toString() {
return indexToString() + _o.toString();
}
private String indexToString() {
return Util.toLetter(_i);
}
}

As you can see, there is code duplication. Rewrite it to remove the duplication