map<String,ArrayList<String>>

Map <String, ArrayList> map = new HashMap <String, ArrayList>();
Set<String> keys = map.keySet();
Iterator<String> iterator = keys.iterator();
while(iterator.hasNext()) {
    String key = iterator.next();
    ArrayList arrayList = map.get(key);
    for(Object o : arrayList) {
        ...
    }
}
在网上查到的