linkedhashmap

Android LinkedHashMap deserializing as HashMap, causes CCE error

由 妖精的绣舞 提交于 2019-12-22 12:27:14
问题 I'm attempting to pass a serialized LinkedHashMap between activities, and getting a confusing result/error when I deserialize the object. I serialize the object as follows: Bundle exDetails = new Bundle(); LinkedHashMap<String, Exercise> exMap = new LinkedHashMap<String, Exercise (workout.getExercises()); exDetails.putString(WORKOUTNAME, workout.getWorkoutName()); exDetails.putSerializable(workout.getWorkoutName(), exMap); iComplete.putExtra("wName", exDetails); startActivity(iComplete); That

Iterate Json data from web service in correct order

由 杀马特。学长 韩版系。学妹 提交于 2019-12-22 08:59:30
问题 I have a response coming from a web service, data is in JSON form. JSONObject event:- { "15:00":{"type":1,"status":null,"appointment_id":null}, "16:00":{"type":1,"status":null,"appointment_id":null}, "17:00":{"type":1,"status":null,"appointment_id":null}, "18:00":{"type":1,"status":"1","appointment_id":5} } I don't know the key values, they are random. So when i iterate the data using iterator by fetching keys and hasNext() . It returns the data but changes the order of coming data. Iterator

How to sort a LinkedHashMap by its value class's field?

由 落花浮王杯 提交于 2019-12-22 07:36:08
问题 I use the following lines to sort a LinkedHashMap, but not all items are sorted, anything wrong ? LinkedHashMap<String,PatternData> statisticsMap; // fill in the map ... LinkedHashMap<String,PatternData> sortedStatisticsMap=new LinkedHashMap<String,PatternData>(); // Sort it by patternData's average ArrayList<PatternData> statisticsMapValues=new ArrayList<PatternData>(statisticsMap.values()); Collections.sort(statisticsMapValues,Collections.reverseOrder()); // Sorting it (in reverse order)

Why doesn't LinkedHashMap provide access by index?

由 a 夏天 提交于 2019-12-22 03:19:09
问题 From Javadoc: Hash table and linked list implementation of the Map interface, with predictable iteration order. This implementation differs from HashMap in that it maintains a doubly-linked list running through all of its entries. If it is so, then why doesn't it provide object access like List in java, list.get(index); UPDATE I had implemented LRU Cache using LinkedHashMap. My algorithm required me to access LRU Object from the cache. That's why I required random access, but I think that

Casting LinkedHashMap to Complex Object

由 淺唱寂寞╮ 提交于 2019-12-17 08:30:09
问题 I've got an application that stores some data in DynamoDB using Jackson to marshall my complex object into a JSON. For example the object I'm marshalling might look like this: private String aString; private List<SomeObject> someObjectList; Where SomeObject might look like this: private int anInteger; private SomeOtherObject; and SomeOtherObject might look like this: private long aLong; private float aFloat; This is fine an the object gets marshalled no problem and stored in the DB as a JSON

Java LinkedHashMap get first or last entry

由 亡梦爱人 提交于 2019-12-17 03:28:14
问题 I have used LinkedHashMap because it is important the order in which keys entered in the map. But now I want to get the value of key in the first place (the first entered entry) or the last. Should there be a method like first() and last() or something like that? Do I need to have an iterator to just get the first key entry? That is why I used LinkedHashMap! Thanks! 回答1: The semantics of LinkedHashMap are still those of a Map, rather than that of a LinkedList . It retains insertion order, yes

Java集合四大家族的故事（四）——Map家族的LinkedHashMap

由 好久不见. 提交于 2019-12-16 10:54:37
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 每个家族都有一个最基本且最常用的数据类型：比如List系列的ArrayList，Map系列的HashMap，并且，它们的本质都是数组存储结构。相似的是，每个家族都有一个Linked开头的类，如List家族的LinkedList和Map家族的LinkedHashMap，这两个类的存储的数据结构又都是双向链表（其实是连续数组添加了两个方向的指针，所以既能与数组兼容，又能够有双向链表的性质）。而引入双向链表功能的目的就是为了能够有序遍历。 今天，我们就来介绍 LinkedHashMap。 扩展HashMap增加双向链表的实现，号称是最占内存的数据结构。支持iterator()时按Entry的插入顺序来排序(但是更新不算， 如果设置accessOrder属性为true，则所有读写访问都算)。 实现上是在Entry上再增加属性before/after指针，插入时把自己加到Header Entry的前面去。如果所有读写访问都要排序，还要把前后Entry的before/after拼接起来以在链表中删除掉自己。 (本文出自：http://my.oschina.net/happyBKs/blog/493260) 下面的例子，我没对LinkedHashMap和HashMap分别做了两组比较，数据两组分别一一对应。 我们可以发现，

LinkedHashMap printing formatted?

由 无人久伴 提交于 2019-12-14 03:29:31
问题 Hey I have a LinkedHashMap containing several values but I'm struggling to print it in the format I want. It will be passed a size integer, and I want it to print out the values in a square format, and if there's not a value for a certain key up to the size value to place a 0 there instead. Say these are the values in the hashmap, first is location, 2nd is value hashmap.put(1, 10); hashmap.put(2, 90); hashmap.put(4, 9); hashmap.put(7, 2); hashmap.put(11, 4); hashmap.put(14, 45); I'd like it

Data Structure for Queue using Map Implementations in Java with Size limit of 5

由 强颜欢笑 提交于 2019-12-13 19:17:27
问题 I have map with some records. I want to restrict that map to only 5 elements and whenever a new element is added the first item should be removed and new element should be added in last position of map. Something similar to FIFO. Can anyone please suggest me a data structure to use or the solution itself. E.g : Map<String,String> map=new LinkedHashMap<String,String>(5); for(int i=0;i<5;i++){ map.put(i+"",i+""); } map.put("5","5"); /* should remove map.get(0) and map.size will be still 5

comparator for LinkedHashMap

由 我是研究僧i 提交于 2019-12-13 09:22:46
问题 i am making a program to read data from excel files and store them in tables. But since I am new to Comparators in Java i have difficulties in making one of them. Here is my issue, I have managed to read all the data from excel files as a string and store them in a table. But my project is to store them in table by ascending IDs. Can someone help me to create a Comparator to compare LinkedHashmaps and store them by their IDs? The data that I have to store is like the below: ID Name Salary 50
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