public String toString() {
    Iterator<Entry> i = entrySet().iterator();
    if (!i.hasNext()) {
      return "{}";
    }

    StringBuilder sb = new StringBuilder();
    sb.append('{');
    for (;;) {
      Entry e = i.next();
      Object key = e.getKey();
      int value = e.getValue();
      sb.append(key == this ? "(this Map)" : key);
      sb.append('=');
      sb.append(value);
      if (!i.hasNext()) {
        return sb.append('}').toString();
      }
      sb.append(", ");
    }
  }
Returns a string representation of this map. The string representation consists of a list of
key-value mappings in the order returned by the map's <tt>entrySet</tt> view's iterator,
enclosed in braces (<tt>"{}"</tt>). Adjacent mappings are separated by the characters
<tt>", "</tt> (comma and space). Each key-value mapping is rendered as the key followed by an
equals sign (<tt>"="</tt>) followed by the associated value. Keys and values are converted to
strings as by {@link String#valueOf(Object)}.

@return a string representation of this map
geode-core/src/main/java/org/apache/geode/cache/query/internal/ObjectIntHashMap.java