问Hashmap迭代器(keySet和entrySet)产生不同的结果

EN

HashMap map = getHashMapData();
System.out.println("####Iterate over keySet");
for (Iterator iterator = map.keySet().iterator(); iterator.hasNext();) {
    Object  key = (Object) iterator.next();
    System.out.println(key +" : "+map.get(key));
}
System.out.println("####Iterate over entrySet");
for (Iterator it = map.entrySet().iterator(); it.hasNext();){
    Entry e = (Entry) it.next();
    System.out.println(e.getKey() +":"+ e.getValue());  
}
System.out.println("###sysout map");
System.out.println(map);

####Iterate over keySet
[4/11/14 9:33:14:737 EEST] 00000095 SystemOut     O persistData : null
[4/11/14 9:33:16:017 EEST] 00000095 SystemOut     O processCodeDVO : null
####Iterate over entrySet
[4/11/14 9:33:18:169 EEST] 00000095 SystemOut     O persistData:[27883271, 22644993]
[4/11/14 9:33:19:199 EEST] 00000095 SystemOut     O processCodeDVO:test.dvo.ProcessCodeDVO@a31742c
###sysout map
[4/11/14 9:33:21:414 EEST] 00000095 SystemOut     O {persistData=[27883271, 22644993], processCodeDVO=test.dvo.ProcessCodeDVO@a31742c}