java Map,ArrayList 排序

java Map,ArrayList 排序"/>

java Map,ArrayList 排序

1.Map<key,value> 排序

    /*** map 排序** @param map* @param reverse true:降序，false:升序* @return*/public static Map sortByValue(Map<String, Double> map, final boolean reverse) {List list = new LinkedList(map.entrySet());Collections.sort(list, new Comparator() {public int compare(Object o1, Object o2) {if (reverse) {return -((Comparable) ((Map.Entry) o1).getValue())pareTo(((Map.Entry) o2).getValue());}return ((Comparable) ((Map.Entry) o1).getValue())pareTo(((Map.Entry) o2).getValue());}});Map result = new LinkedHashMap();for (Iterator it = list.iterator(); it.hasNext(); ) {Map.Entry entry = (Map.Entry) it.next();result.put(entry.getKey(), entry.getValue());}return result;}

  /*** 根据销量排序*  String  "aa:39:ww"* @param list 二级分类下的产品集合* @param*/public static void sortListValue(List<String> list) {for (int i = 0; i < list.size(); i++) {for (int j = 1; j < list.size(); j++) {//ddd:20: j的值String key1 = list.get(j);String[] array1 = key1.split(":");int salesVolume1 = Integer.parseInt(array1[1]);// j -1 的值String key2 = list.get(j - 1);String[] array2 = key2.split(":");int salesVolume2 = Integer.parseInt(array2[1]);String temp;if (salesVolume1 - salesVolume2 > 0) { // 比较两个整数的大小temp = list.get(j);list.set(j, list.get(j - 1));list.set((j - 1), temp);}}}}