Map遍历

我原来遍历Map是这样遍历的： 
Map<String,Object> map = new HashMap<String,Object>(); 
Set<String> keySet = map.keySet(); 
for (String key : keySet) { 
Object o = map.get(key); 
} 
被findBug找到后，优化为： 
Set<Entry<String,Object>> entrySet = map.entrySet(); 
for (Entry<String, Object> entry : entrySet) { 
Object o = entry.getValue(); 
}