java hashtable 排序问题
时间:2014-05-01 14:22:31
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Hashtable<String, String> h = new
Hashtable<String, String>(); h.put( "6" , "666" ); h.put( "8" , "888" ); h.put( "2" , "222" ); <br> for
(String key : h.keySet()) System.out.println(key); System.out.println( "----------------------------------------------------------" ); List<String> v = new
ArrayList<String>(h.keySet()); Collections.sort(v, new
Comparator<Object>() { public
int compare(Object arg0, Object arg1) { return
Integer.valueOf(arg0.toString()) - Integer.valueOf(arg1.toString()); // 升序,参数顺序对调时降序<br> } }); for (String key : v) System.out.println(key + " "
+ h.get(key)); |
hashtable默认以主键降序存储,包括数值和字符串主键,对象类型主要未测试。
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