MAO-EYE 2010-05-22 21:10 采纳率: 100%
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Hashmap、 LinkedHashMap 与 TreeMap 的区别

What is the difference between HashMap, LinkedHashMap and TreeMap in Java? I don't see any difference in the output as all the three has keySet and values. What are Hashtables?

Map m1 = new HashMap();
m1.put("map", "HashMap");
m1.put("schildt", "java2");
m1.put("mathew", "Hyden");
m1.put("schildt", "java2s");
print(m1.keySet()); 
print(m1.values()); 

SortedMap sm = new TreeMap();
sm.put("map", "TreeMap");
sm.put("schildt", "java2");
sm.put("mathew", "Hyden");
sm.put("schildt", "java2s");
print(sm.keySet()); 
print(sm.values());

LinkedHashMap lm = new LinkedHashMap();
lm.put("map", "LinkedHashMap");
lm.put("schildt", "java2");
lm.put("mathew", "Hyden");
lm.put("schildt", "java2s");
print(lm.keySet()); 
print(lm.values());

转载于:https://stackoverflow.com/questions/2889777/difference-between-hashmap-linkedhashmap-and-treemap

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14条回答 默认 最新

  • ℡Wang Yan 2010-05-22 21:12
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    These are different implementations of the same interface. Each implementation has some advantages and some disadvantages (fast insert, slow search) or vice versa.

    For details look at the javadoc of TreeMap, HashMap, LinkedHashMap.

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