Status

public class Status {

  public int source;
  public int tag;

  public int index ;

  // Blocking Send and Receive operations

  public int Get_count(Datatype datatype) throws MPIException {...}


  // Probe and Cancel

  public boolean Test_cancelled() throws MPIException {...}


  // Derived datatypes

  public int Get_elements(Datatype datatype) throws MPIException {...}

  ...
}