linkedhashmap

I have an ordered LinkedHashMap and i want to add element at specific index , say at first place or last place in the map. How can i add element in LinkedHashMap at an specific position? Even if I could add an element to FIRST or LAST position in LinkedHashMap would help! MasterCassim You can not change the order. It is insert-order (by default) or access-order with this constructor: public LinkedHashMap(int initialCapacity, float loadFactor, boolean accessOrder) Constructs an empty LinkedHashMap instance with the specified initial capacity, load factor and ordering mode. Parameters:

I am using a linkedHashMap to guarantee order when someone tries to access it. However, when it comes time to iterate over it, does using entrySet() to return key/value pairs guarantee order as well? No changes will be made while iterating. EDIT: Also, are there any adverse effects from iterating through the map by iterating through its keys and calling get? Michael Myers According to the Javadocs , yes. This implementation differs from HashMap in that it maintains a doubly-linked list running through all of its entries. This linked list defines the iteration ordering, which is normally the

What is the difference between LRU and LFU cache implementations? I know that LRU can be implemented using LinkedHashMap . But how to implement LFU cache? Zorayr Let's consider a constant stream of cache requests with a cache capacity of 3, see below: A, B, C, A, A, A, A, A, A, A, A, A, A, A, B, C, D If we just consider a Least Recently Used (LRU) cache with a HashMap + doubly linked list implementation with O(1) eviction time and O(1) load time, we would have the following elements cached while processing the caching requests as mentioned above. [A] [A, B] [A, B, C] [B, C, A] <- a stream of

I want send LinkedHashMap to another Intent. But I don't known what method for extras is allowable. Bundle extras = getIntent().getExtras(); LinkedHashMap<Integer, String[]> listItems = extras.get(LIST_TXT); David Wasser You cannot reliably send a LinkedHashMap as an Intent extra. When you call putExtra() with a LinkedHashMap , Android sees that the object implements the Map interface, so it serializes the name/value pairs into the extras Bundle in the Intent . When you want to extract it on the other side, what you get is a HashMap , not a LinkedHashMap . Unfortunately, this HashMap that you

I have a hashtable . values() method returns values in some order different from the order in which i am inserted.How can i get the values in the same order as i inserted?Using LinkedHashmap is an alternative but it is not synchronized. cletus Use a LinkedHashMap . 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. This linked list defines the iteration ordering, which is normally the order in which keys were inserted into the map

Possible Duplicate: Iterating through a LinkedHashMap in reverse order How to traverse Linked Hash Map in a reverse order? Is there any predefined method in map to do that? I'm creating it as follows: LinkedHashMap<Integer, String> map = new LinkedHashMap<Integer,String>(); map.put(1, "one"); map.put(2, "two"); map.put(3, "three"); List<Entry<Integer,String>> list = new ArrayList<>(map.entries()); for( int i = list.size() -1; i >= 0 ; i --){ Entry<Integer,String> entry = list.get(i); } Not really pretty and at the cost of a copy of the entry set, which if your map has a significant number of

I have a problem that is really kind of a general programming question, but my implementation is in Java, so I will provide my examples that way I have a class like this: public class Foo { LinkedHashMap<String, Vector<String>> dataStructure; public Foo(LinkedHashMap<String, Vector<String>> dataStructure){ this.dataStructure = dataStructure; } public String[][] allUniqueCombinations(){ //this is what I need to do } } I need to generate a nested array from my LinkedHashMap that represents every unique combination of all values in the LHM. for example, if my LHM looks like this (pseudocode, but