Java HashMapis unordered. Ordered containers can be used LinkedHashMap
in cmopareinterfaces Integeror when comparing objects Datethrough compareTomethods. When the "comparison object" is larger than the "comparison object", it returns -1, when it is equal, it returns 0, and when it is small, it returns 1.
/**
* 将容器按照日期、数字等类型的键，排序
* @return
* @param map
* @param orderRule 0为升序，1为降序
* @param keyType 0为数字类型 1为日期类型
*/
private static Map containerSortByKey(Map map, Integer keyType, Integer orderRule){
if(ConstantHelper.NUMBER_0 == keyType){
List<Map.Entry<Integer, Object>> infoIds = new ArrayList<Map.Entry<Integer, Object>>(map.entrySet());
Collections.sort(infoIds, new Comparator<Map.Entry<Integer, Object>>() {
@Override
public int compare(Map.Entry<Integer, Object> o1, Map.Entry<Integer, Object> o2) {
return ConstantHelper.NUMBER_0 == orderRule?o1.getKey().compareTo(o2.getKey()):o2.getKey().compareTo(o1.getKey());
}
});
}else if(ConstantHelper.NUMBER_1 == keyType){
List<Map.Entry<Date, Object>> infoIds = new ArrayList<Map.Entry<Date, Object>>(map.entrySet());
Collections.sort(infoIds, new Comparator<Map.Entry<Date, Object>>() {
@Override
public int compare(Map.Entry<Date, Object> o1, Map.Entry<Date, Object> o2) {
return ConstantHelper.NUMBER_0 == orderRule?o1.getKey().compareTo(o2.getKey()):o2.getKey().compareTo(o1.getKey());
}
});
}
return map;
}
/**
* 将容器按照日期、数字等类型的值，排序
* @param map
* @param valueType 0为数字类型 1为日期类型
* @param orderRule 0为升序，1为降序
* @return
*/
public static Map containerSortByValue(Map map,Integer valueType,Integer orderRule){
if(ConstantHelper.NUMBER_0 == valueType){
List<Map.Entry<Object, Integer>> valueList = new LinkedList<Map.Entry<Object, Integer>>(map.entrySet());
Collections.sort(valueList, new Comparator<Map.Entry<Object, Integer>>() {
@Override
public int compare(Map.Entry<Object, Integer> o1,Map.Entry<Object, Integer> o2) {
return ConstantHelper.NUMBER_0 == orderRule ? o1.getValue().compareTo(o2.getValue()):o2.getValue().compareTo(o1.getValue());
}
});
HashMap<Object,Integer> resultMap =new LinkedHashMap<>();
for(Map.Entry<Object, Integer> entry:valueList){
resultMap.put(entry.getKey(),entry.getValue());
}
return resultMap;
}else if(ConstantHelper.NUMBER_1 == valueType){
List<Map.Entry<Object, Date>> valueList = new LinkedList<Map.Entry<Object, Date>>(map.entrySet());
Collections.sort(valueList, new Comparator<Map.Entry<Object, Date>>() {
@Override
public int compare(Map.Entry<Object, Date> o1,Map.Entry<Object, Date> o2) {
return ConstantHelper.NUMBER_0 == orderRule ?(o1.getValue().compareTo(o2.getValue())):(o2.getValue().compareTo(o1.getValue()));
});
HashMap<Object,Date> resultMap =new LinkedHashMap<>();
for(Map.Entry<Object, Date> entry:valueList){
resultMap.put(entry.getKey(),entry.getValue());
}
return resultMap;
}else {
return null;
}
}