请问一个Map集合的问题..
我有一个需求,需要以key value形式进行存储...
有什么办法 可以让 map 的key重复,并且 允许NullKey nullValue呢????????
在线等,,或者有更好的办法,要code,或者清晰的思路,Thank!!!!!!!!!!!!
在线等,
[解决办法]
public class MyMapList{
private List<MyMap> mapList = new ArrayList<MyMap>{}
}
private class MyMap{
private String key;
private String value;
}
[解决办法]
可以使用google guava 提供的 Multimap
put
boolean put(@Nullable
K key,
@Nullable
V value)
Stores a key-value pair in the multimap.
Some multimap implementations allow duplicate key-value pairs, in which case put always adds a new key-value pair and increases the multimap size by 1. Other implementations prohibit duplicates, and storing a key-value pair that's already in the multimap has no effect.
Parameters:
key - key to store in the multimap
value - value to store in the multimap
Returns:
true if the method increased the size of the multimap, or false if the multimap already contained the key-value pair and doesn't allow duplicates
[解决办法]
给你个建议，你可以讲你需要的数据存入map中，map中的键值是不允许重复的，但set list中的数据可以重复，所以你可以将你添加的数据存入map中后，再存入到list中，也许这样可以解决你的需求哟！
