HashMap、LinkedHashMap和treemap的区别
HashMap
, LinkedHashMap
TreeMap
keySet
values
Hashtable
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());
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