public boolean isSilence(){
  if (isSilence == -1) {
    String silenceSymbol="_";
    if (name.startsWith(silenceSymbol)) {
      isSilence=1;
    }
 else {
      isSilence=0;
    }
  }
  return isSilence == 1;
}

public boolean isSilence ( ) { if ( isSilence == - 1 ) { String silenceSymbol = "_" ; if ( name . startsWith ( silenceSymbol ) ) { isSilence = 1 ; } else { isSilence = 0 ; } } return isSilence == 1 ; }
determine whether this target is a silence target
