如何在Java中分割一个HashMap [英] How to split an HashMap in Java
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问题描述
在我的例子中,我有一个包含100个元素的HashMap,我希望能够将HashMap分解为更小的子地图。创建2个(或更多)较小的HashMaps,第一个包含从0到49的条目,第二个包含从50到99的条目。
映射< Integer,Integer> bigMap = new HashMap< Integer,Integer>();
//应该包含'bigMap'的0到49的条目
Map< Integer,Integer> smallMap1 = new HashMap< Integer,Integer>();
//应包含来自'bigMap'的50到99的条目
映射< Integer,Integer> smallMap2 = new HashMap< Integer,Integer>();
有什么建议吗?非常感谢!
解决方案
您是否必须使用 HashMap
?
TreeMap
对于这类事情真的很好。这里有一个例子。
TreeMap< Integer,Integer> sorted = new TreeMap< Integer,Integer>(bigMap);
SortedMap< Integer,Integer> zeroToFortyNine = sorted.subMap(0,50);
SortedMap< Integer,Integer> fiftyToNinetyNine = sorted.subMap(50,100);
I was wondering if it is possible to split a HashMap into smaller sub-maps.
In my case I have a HashMap of 100 elements and I would like to create 2 (or more) smaller HashMaps from the original one, the first containing the Entries from 0 to 49, the second containing the Entries from 50 to 99.
Map <Integer, Integer> bigMap = new HashMap <Integer, Integer>();
//should contains entries from 0 to 49 of 'bigMap'
Map <Integer, Integer> smallMap1 = new HashMap <Integer, Integer>();
//should contains entries from 50 to 99 of 'bigMap'
Map <Integer, Integer> smallMap2 = new HashMap <Integer, Integer>();
Any suggestions? Many thanks!
解决方案
Do you have to use HashMap
?
TreeMap
is really good for this kind of things. Here's an example.
TreeMap<Integer, Integer> sorted = new TreeMap<Integer, Integer>(bigMap);
SortedMap<Integer, Integer> zeroToFortyNine = sorted.subMap(0, 50);
SortedMap<Integer, Integer> fiftyToNinetyNine = sorted.subMap(50, 100);
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