structure « HashMap « Java Collection Q&A

1. Which data structure would you use: TreeMap or HashMap? (Java)    stackoverflow.com

Description | A Java program to read a text file and print each of the unique words in alphabetical order together with the number of times the word occurs in the ...

2. C++ data structure with lookuptime O(1), like java's hashmap in stl?    stackoverflow.com

Is there such a structure in c++ standard library? I don't have access to anything else so unordered_map in tr1 cant be used (and boost etc). What I have is a large ...

3. Do all Hash-based datastructures in java use the 'bucket' concept?    stackoverflow.com

The hash structures I am aware of - HashTable, HashSet & HashMap. Do they all use the bucket structure - ie when two hashcodes are similar exactly the same one element does ...

4. Java Generics Type Safety warning with recursive Hashmap    stackoverflow.com

I'm using a recursive tree of hashmaps, specifically Hashmap map where Object is a reference to another Hashmap and so on. This will be passed around a recursive algorithm:

foo(String filename, Hashmap<String, ...

5. Java many to many association map    stackoverflow.com

I have to classes, ClassA and ClassB and a "many to many" AssociationClass. I want to use a structure to hold the associations between A and B such as I can ...

6. In Java, Why cannot we use generically a common DataStructure like HashMap for all the scenarios?    stackoverflow.com

Since, the hardware is becoming very cheap and has very huge memory available these days.Why cannot we use generically a common DataStructure like HashMap for all the scenarios ? If not, ...

7. Datastructure for random word retrieval    stackoverflow.com

I am trying to build a word-based-game application in Java. I browsed through some existing questions and got some idea how to get wordlist. Some of the questions I have referred ...

8. Sortable HashMap-like data structure in Java?    stackoverflow.com

Is there some sort of data structure in Java that resembles a HashMap that can be sorted by key or value? In PHP you can have associative arrays that ...

9. traversing xml file structure and storing them for later use in hashmaps in java    stackoverflow.com

I've XML file structure for single table node as below

<table ID="123" Name="Prj">
  <select>
        <slno>prjslno</slno>
        <to>prjrecepient</to>
  ...

10. Internal implementation of data structures in java?    stackoverflow.com

Is there a source where I can find detailed implementation information of various data structures in Java (HashMaps, TreeSets etc.). e.g: What is the hash function used for different types? Is it ...

11. Data structure for searching (different) Integers Java    stackoverflow.com

I am looking for a data structure, optimized for search-operations (in the Java std-lib). I have to iterate over it several times, control every element and delete it in special cases. ...

12. sorting a 2d data structure in java    stackoverflow.com

I need to sort a 2d key/value pair by the value. I have read many references about this on the web and have ended up writing my own class to ...

13. Java memory usage of simple data structure    stackoverflow.com

I want to have a quite exact measurement of my cache implemented in java. Please tell me if this approach is possible. I have a hashmap mapping a string to an array ...

14. hashmap or other structure?    coderanch.com

hi folks, I've been trying to come up with a solution, to a not-so-difficult-problem (maybe?). The issue is, that I want to index some files (actually quite many), but I want to store the vocabulary (set of unique terms) in the main memory with pointer to the db records, which in turn contain other information related to the terms in the ...

15. Good idea how to structure my data in a HashMap, HashSet or ?    coderanch.com

I have a big hashmap, here are some of the value: Key Value -5;10 7 11;20 8 21;30 9 The data is loaded in memory in the server, so i dont need to load the data. Now i have to create a methoed the retrieves a int, eksample, if i retrieve 6 this is a value between -5 and 10,if have ...