Map « HashTable « Java Collection Q&A

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Java Collection Q&A » HashTable » Map

1. Multi-valued hashtable in Java stackoverflow.com

Is it possible to have multiple values for the same key in a hash table? If not, can you suggest any such class or interface which could be used?

2. What is the easiest way to sort maps according to values in Java? stackoverflow.com

I want my hash to sort in descending order according to the values. How do I do that in Java?

3. How to sort a Java Hashtable? stackoverflow.com

I inserted some data into a Java Hashtable. If I read the data from the Hashtable it doesn't come back in the same order that I inserted it in. How do ...

4. Alternatives to 2D Arrays in Java stackoverflow.com

I have a lookup table that should be accessed by two separate key values. One ugly way to do this is:

int[][] myArray = new int[256][256];
myArray[key1][key2] = 25;

where key1 and key2 are ...

5. iterators in Unordered (or Hash) Maps stackoverflow.com

As far as I understand, Hashmaps are preferable to standard maps because you can find elements in close to O(1) time. This is done by using a hash or the key ...

6. Hash Tables and Hash Map coderanch.com

7. How to pass a Map as an object into Hashtable coderanch.com

8. Hashtables and Maps coderanch.com

Hi All, I'm confused by how a hashtable works? Is it a spreadsheet style collection where you can store multiple columns of information under a key? Or is it limited to just one column per key? Ie.. Key, data1, data2, data3 I need a collection which can store a series of data which is related Thanks

9. Difference between hashtable and hash map coderanch.com

10. diff betwen Hasp Map and Hash Table coderanch.com

11. hash map.hash table.... coderanch.com

Hashtable and Vector are legacy collection classes - they are old collection classes that have existed since Java 1.0 (or maybe even earlier). In Java 1.2 (long ago), new collection classes were added such as HashMap and ArrayList, which more or less replace the old classes. When Sun was developing Java 1.2, they realized that most people don't need synchronization (in ...