@Override public final String toString(){
  StringBuilder builder=new StringBuilder();
  builder.append("[ ");
  for (  LongWritable v : this.vertices) {
    builder.append(v.toString());
    builder.append(" ");
  }
  builder.append(" | " + score + ", "+ innerScore+ ", "+ boundaryScore+ " ]");
  return builder.toString();
}

@ Override public final String toString ( ) { StringBuilder builder = new StringBuilder ( ) ; builder . append ( "[ " ) ; for ( LongWritable v : this . vertices ) { builder . append ( v . toString ( ) ) ; builder . append ( " " ) ; } builder . append ( " | " + score + ", " + innerScore + ", " + boundaryScore + " ]" ) ; return builder . toString ( ) ; }
convert object to string object .
