Suppose I have a Java method that returns a HashMap object. Because a LinkedHashMap is a subclass of HashMap, I can return a LinkedHashMap from this method just fine. On the next "read" action (no adding/removing/modifying of K/V pairs), would iterating over the keys of the resulting method (which returns a HashMap) go in the same ord...
HashMap selections = new HashMap<Integer, Float>(); How can i get the Integer key of the 3rd smaller value of Float in all HashMap? Edit im using the HashMap for this for (InflatedRunner runner : prices.getRunners()) { for (InflatedMarketPrices.InflatedPrice price : runner.getLayPrices()) { if (price.getDepth() == 1...
Hi folks, For my trading program, a Merchant object has a qualities HashMap of enumerated Qualities with Boolean values. public class Merchants { private Map<Qualities, Boolean> qualities = new HashMap<Qualities, Boolean>(); I would like to give each Merchant object a further ratedQualities HashMap of True Qualities with Byte or ...
Hello, I am new to Android development and I ran into a problem which I find difficult to solve. I am trying to figure out how to use an AutoCompleteTextView widget properly. I want to create a AutoCompleteTextView, using XML data from a web service. I managed to get it to work, but I am defenitely not pleased with the output. I woul...
I have a number of traceroutes that i need to compare against each other but i dont know the best way to do it, ive been told that hash maps are a good technique but i dont know how to implement them on my code. so far i have: FileInputStream fstream = new FileInputStream("traceroute.log"); // Get the object of DataInputStream DataI...
In java if I am looping over the keySet() of a HashMap, how do I (inside the loop), get the numerical index of that key? Basically, as I loop through the map, I want to be able to get 0,1,2...I figure this would be cleaner than declaring an int and incrementing with each iteration. Thanks. ...
If I have two multiple threads accessing a HashMap, but guarantee that they'll never be accessing the same key at the same time, could that still lead to a race condition? ...
Hi, I'm trying to build a chart program using presentation model. Using JGoodies for data binding was relatively easy for simple types like strings or numbers. But I can't figure out how to use it on a hashmap. I'll try to explain how the chart works and what my problem is: A chart consists of DataSeries, a DataSeries consists of Data...
This question is a continuation of this thread: In short: To solve my problem, I want to use Map<Set<String>, String>. However, after I sort my data entries in Excel, remove the unnecessary parameters, and the following came out: flow content ==> content content flow content ==> content depth distance flow content ==> content depth ...
I have two lists ( not java lists, you can say two columns) For example **List 1** **Lists 2** milan hafil dingo iga iga dingo elpha binga hafil mike meat dingo milan elpha meat iga neet...
Apart from the fact that hashSet does not allow duplicate values, what is the difference between a HashMap and Hashset...? I mean implementaion wise.....? It's a little bit vague because both use hash table to store values..... ...
Hi, I have a HashMap in Java, the contents of which (as you all probably know) can be accessed by HashMap.get("keyname"); If a have a HashMap inside another HashMap i.e. a nested HashMap, how would i access the contents? Can i do this like this, inline: HashMap.get("keyname").get("nestedkeyname"); Thank you. ...
Would a hashtable/hashmap use a lot of memory if it only consists of object references and int's? As for a school project we had to map a database to objects (that's what being done by orm/hibernate nowadays) but eager to find a good way not to store id's in objects in order to save them again we thought of putting all objects we create...
Hi, I'm requesting data from a server which returns data in the JSON format. Casting a HashMap into JSON when making the request wasn't hard at all but the other way seems to be a little tricky. The JSON response looks like this: { "header" : { "alerts" : [ { "AlertID" : "2", "TSExpires" : null, "Target" : "1", ...
hi i have a linkedhashmap and i need to permute (change the key of the values) between 2 random values example : key 1 value 123 key 2 value 456 key 3 value 789 after random permutation of 2 values key 1 value 123 key 2 value 789 key 3 value 456 so here I permuted values between key 2 and key 3 thank you; sample of the code of m...
This is what I tried to do, but it gives me a warning: HashMap<String, String>[] responseArray = new HashMap[games.size()]; "Type safety: The expression of type HashMap[] needs unchecked conversion to conform to HashMap[]" ...
I have the following code to read in text, store in a hashmap as bigrams (with other methods to sort them by frequency and do v. v. basic additive smoothing. I had it working great for one language input file (english) and then I want to expand it for the second language input file (japanese - doens;t matter what it is I suppose) usin...
How mouch Scala standard library can be reused to create variant of HashMap that does not handle collisions at all? In HashMap implementation in Scala I can see that traits HashEntry, DefaultEntry and LinkedEntry are related, but I'm not sure whether I have any control over them. ...
What is a good C++ library for hash tables / hash maps similar to what java offers. I have worked with Google Sparsehash, but it has no support for collisions. ...
Consider the follwing HashMap.clear() code: /** * Removes all of the mappings from this map. * The map will be empty after this call returns. */ public void clear() { modCount++; Entry[] tab = table; for (int i = 0; i < tab.length; i++) tab[i] = null; size = 0; } It seems, that the internal array (table) of...