code: public void setKeys(java.util.Collection<Key> keys) {
          if (keys == null) {
              this.keys = null;
              return;
          }
  
          java.util.List<Key> keysCopy = new java.util.ArrayList<Key>(keys.size());
          keysCopy.addAll(keys);
          this.keys = keysCopy;
      }
docs: Sets the value of the Keys property for this object.
  <p>
  <b>Constraints:</b><br/>
  <b>Length: </b>1 - 100<br/>
  
  @param keys The new value for the Keys property for this object.