List presenter decorator

ListPresenterDecorator.java

public class ListPresenterDecorator<T> extends AbstractList<T> {

    private List<T> list;

    public ListPresenterDecorator(List<T> list) {
        this.list = list;
    }

    public String present() {
        return list.stream()
                .map(Object::toString)
                .collect(Collectors.joining(", "));
    }

    @Override
    public T get(int index) {
        return list.get(index);
    }

    @Override
    public int size() {
        return list.size();
    }
}