code: public void setPlacedPlayerSessions(java.util.Collection<PlacedPlayerSession> placedPlayerSessions) {
          if (placedPlayerSessions == null) {
              this.placedPlayerSessions = null;
              return;
          }
  
          this.placedPlayerSessions = new java.util.ArrayList<PlacedPlayerSession>(placedPlayerSessions);
      }
docs: <p>
  Collection of information on player sessions created in response to the game session placement request. These
  player sessions are created only once a new game session is successfully placed (placement status is
  <code>FULFILLED</code>). This information includes the player ID (as provided in the placement request) and the
  corresponding player session ID. Retrieve full player sessions by calling <a>DescribePlayerSessions</a> with the
  player session ID.
  </p>
  
  @param placedPlayerSessions
  Collection of information on player sessions created in response to the game session placement request.
  These player sessions are created only once a new game session is successfully placed (placement status is
  <code>FULFILLED</code>). This information includes the player ID (as provided in the placement request)
  and the corresponding player session ID. Retrieve full player sessions by calling
  <a>DescribePlayerSessions</a> with the player session ID.