title: What does the dot mean at the end of an association?
body: <p>I reversed some Java code to get a uml class diagram using Visual Paradigm. The diagram shows some associations with little black circles on one end, which I never saw before. </p>
  
  <p><a href="https://imgur.com/a/ZGqHQ" rel="noreferrer">Image</a></p>
  
  <p>It's definitely not a composition and not a containment! Can anybody explain to me, what kind of association this is?</p>
  
  <p>Here's the related code:</p>
  
  <pre><code>public class DataAdapter extends RecyclerView.Adapter&lt;DataAdapter.ViewHolder&gt; {
      public static final String TAG = DataAdapter.class.getSimpleName();
  
      private static Context mContext;
      private ArrayList&lt;DataClass&gt; mData;
      private static OnItemClickListener&lt;DataClass&gt; mListener;
  
      public static class ViewHolder extends RecyclerView.ViewHolder {}
  
      public DataAdapter(Context context, ArrayList&lt;DataClass&gt; data) {}
  
      public void setOnClickListener(OnItemClickListener listener) {}
  
      @Override
      public int getItemCount() {}
  
      @Override
      public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {}
  
      @Override
      public void onBindViewHolder(ViewHolder holder, int position) {}
  }
  
  public interface OnItemClickListener&lt;T&gt; {
      public void onItemClick(T item);
  }
  </code></pre>