[英]How to use NavigableMap features with Guava's Multimap (with asMap())?
Let's assume i have something like this: 我们假设我有这样的事情:
Multimap<Integer, Integer> data = TreeMultimap.create();
How can i use .headMap()
on my data? 如何在我的数据上使用.headMap()
? I suppose, that TreeMultimap.asMap()
is the way to go. 我想, TreeMultimap.asMap()
是要走的路。
The documentation ( link ) says, that TreeMap.asMap()
returns NavigableMap<K,Collection<V>>
, but i'm not able to get that to work. 文档( 链接 )说, TreeMap.asMap()
返回NavigableMap<K,Collection<V>>
,但我无法使其工作。
NavigableMap<Integer, ArrayList<Integer>> test = data.asMap(); // type mismatch
SortedMap<Integer, ArrayList<Integer>> test = data.asMap(); // type mismatch
What am i doing wrong? 我究竟做错了什么?
Thanks! 谢谢!
PS: I'm using guava 16 PS:我正在使用番石榴16
The type of data
is Multimap
, not TreeMultimap
. data
类型是Multimap
,而不是TreeMultimap
。 Also, a NavigableMap<Integer, Collection<Integer>>
, is not compatible with NavigableMap<Integer, ArrayList<Integer>>
. 此外, NavigableMap<Integer, Collection<Integer>>
与NavigableMap<Integer, ArrayList<Integer>>
不兼容。
Change your code to: 将您的代码更改为:
TreeMultimap<Integer, Integer> data = TreeMultimap.create();
NavigableMap<Integer, Collection<Integer>> test = data.asMap();
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