排序map
1、根据map的值,升序排序
1 Map<String, Integer> map = new TreeMap<String, Integer>(); 2 map.put("d", 1); 3 map.put("b", 2); 4 map.put("a", 3); 5 map.put("c", 4); 6 7 // 这里将map.entrySet()转换成list 8 List<Map.Entry<String, Integer>> list = new ArrayList<Map.Entry<String, Integer>>(map.entrySet()); 9 // 然后通过比较器来实现排序 10 Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() { 11 // 升序排序 12 public int compare(Entry<String, Integer> o1, Entry<String, Integer> o2) { 13 return o1.getValue().compareTo(o2.getValue()); 14 } 15 16 }); 17 for (Map.Entry<String, Integer> mapping : list) { 18 System.out.println(mapping.getKey() + ":" + mapping.getValue()); 19 }
这个博客主要是javaEE相关或者不相关的记录,
hadoop与spark的相关文章我写在下面地址的博客啦~
http://www.cnblogs.com/sorco