版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/System_out_print_Boy/article/details/84647412
Map的key是机场名字,value 是流量。根据流量倒序排序
/**
* 使用 Map按value进行排序
* @param map
* @return
*/
public static Map<String, Integer> sortMapByValue(Map<String, Integer> oriMap) {
if (oriMap == null || oriMap.isEmpty()) {
return null;
}
Map<String, Integer> sortedMap = new LinkedHashMap<String, Integer>();
List<Map.Entry<String, Integer>> entryList = new ArrayList<Map.Entry<String, Integer>>(
oriMap.entrySet());
Collections.sort(entryList, new MapValueComparator());
Iterator<Map.Entry<String, Integer>> iter = entryList.iterator();
Map.Entry<String, Integer> tmpEntry = null;
while (iter.hasNext()) {
tmpEntry = iter.next();
sortedMap.put(tmpEntry.getKey(), tmpEntry.getValue());
}
return sortedMap;
}
public static class MapValueComparator implements Comparator<Map.Entry<String, Integer>> {
@Override
public int compare(Entry<String, Integer> me1, Entry<String, Integer> me2) {
//按照从大到小的顺序排列,如果想正序 调换me1 me2的位置
return me2.getValue().compareTo(me1.getValue());
}
}