方法一(效率高,推荐使用):
Iterator iter = map.entrySet().iterator();
while(iter.hasNext()){
Map.Entry entry = iter.next();
Object key = entry.getKey();
Object value = entry.getValue();
}
方法二(效率低):
Iterator iter = map.keySet().iterator();
while(iter.hasNext()){
Object key = iter.next();
Object value= map.get(key);
}