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          --- old/src/share/classes/java/util/AbstractMap.java
          +++ new/src/share/classes/java/util/AbstractMap.java
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 516  516          sb.append('{');
 517  517          for (;;) {
 518  518              Entry<K,V> e = i.next();
 519  519              K key = e.getKey();
 520  520              V value = e.getValue();
 521  521              sb.append(key   == this ? "(this Map)" : key);
 522  522              sb.append('=');
 523  523              sb.append(value == this ? "(this Map)" : value);
 524  524              if (! i.hasNext())
 525  525                  return sb.append('}').toString();
 526      -            sb.append(", ");
      526 +            sb.append(',').append(' ');
 527  527          }
 528  528      }
 529  529  
 530  530      /**
 531  531       * Returns a shallow copy of this <tt>AbstractMap</tt> instance: the keys
 532  532       * and values themselves are not cloned.
 533  533       *
 534  534       * @return a shallow copy of this map
 535  535       */
 536  536      protected Object clone() throws CloneNotSupportedException {
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