Hi, I have an object Line which contains 2 objects of type Point called Point1 and Point2. I want to create a HashMap containing lines and whose keys are std::pair<Point1, Point2>. What I'd like to do is find all the Lines with are referenced (for instance) by Point1, i.e. with key std::pair<Point1, Anything>. I don't care about std::...
First off, I would like to make a few points I believe to be true. Please can these be verified? A hash map stores strings by converting them into an integer somehow. std::map is not a hash map, and if I'm using strings, I should consider using a hash map for memory issues? String compares are not good to rely on. If std::map is not...
I need to very efficiently compare two maps in Clojure/Java, and return the difference as determined by Java's .equals(..), with nil/null equivalent to "not present". i.e. I am looking for the most efficient way to a write a function like: (map-difference {:a 1, :b nil, :c 2, :d 3} {:a 1, :b "Hidden", :c 3, :e 5}) => {:b nil, :c 2...
Im new to using HashMap. Im assigned a project to retrieve records from HashMap and display it as a Pie Chart on a JSP. However despite searching and look thru many different Hashmap examples. Im still stuck in my project which is about to due in 3 weeks time :( Kindly please give me some advice and i apologize if my code is in a mess. ...
Hi, I have an array and i try to convert the array contents to a hash with keys and values (index 0 is key, index 1 is value, index 2 is key, index 3 is value, etc). But some how i was struck and it is not producing the expected result. code is given below. open (FILE, "message.xml") || die "Cannot open\n"; $var = <FILE>; while ($va...
Hi, Is there any document regarding "__gnu_cxx::hash_map"? I want to know how to use it. Srinivas ...
I have tried to search on HashMap in Android, but getting problem: Consider this example: HashMap<String, String> meMap=new HashMap<String, String>(); meMap.put("Color1","Red"); meMap.put("Color2","Blue"); meMap.put("Color3","Green"); meMap.put("Color4","White"); now i want to iterate it and get the value of eac...
Hi, I am trying to get my page to link to a certain URL that is stored in a HashMap (the key is some name, and the value is the URL I want to link to). I'm not very good at describing this, but here is my code: For the JSP page: <table> <s:iterator value="dependenciesList" id="dependency"> <tr><td> <a href="<s:url value="pro...
I have set up a HashMap like so: Map<String, ArrayList<String>> theAccused = new HashMap<String, ArrayList<String>>(); ... and I populate this by storing for every name (key), a list of names (value). So: ArrayList<String> saAccused = new ArrayList<String>(); // populate 'saAccused' ArrayList ... // done populating theAccused.put(sAc...
I need to to generate 6 unique random numbers from 1 to 37; At first I used a simple array mapping: private int k=6, n=37; public int[] Results () { // fill an array with numbers 1 2 3 . . . n int[] numbers = new int[n]; for (int i = 0; i < numbers.length; i++) numbers[i] = i + 1; // draw k numbers and put them...
I have the following code which adds some arrays to a hashmap but then I want access those arrays to do some work on them later. I've gotten this far but can't figure the rest out to make it work.... import java.util.HashMap; import java.util.Iterator; import java.util.Map.Entry; public static void main(String[] args) { St...
i need to see my hashMap keys and values in order to check if it s working properly.but im getting an error for the below lines: Iterator iterator = myHashMap.keySet().iterator(); Flows flows = new Flows(); while(iterator.hasNext()){ Object key = iterator.next(); Object value = myHashMap.get(key); // <-- ...
I have a hashMap in java in terms of some keys which each key is indicating a flow. Then each value showing statics about each packet belongs to that flow. What I need to do is, to draw graphs for each flow based on those values. for example: Flow1: {[length, time],[],[],...} Flow2: {[length, time],[length, time],[],...} I need to p...
I have a hashMap in java in terms of some keys which each key is indicating a flow. Then each value showing statics about each packet belongs to that flow. What I need to do is, to draw graphs for each flow based on those values. for example: Flow1: {[length, time],[],[],...} Flow2: {[length, time],[length, time],[],...} i need t...
OK so I have this HashMap private Map<String, Player> players = new HashMap<String, Player>(); Here is what I use to remove: public void destroy() { players.remove("Red"); os.println(me.getUsername() + "|1|has left|yes|chat"); } I say Red because it's just a TEST right now. I will get the eventual correct one later. A...
Possible Duplicates: Java: Efficient Equivalent to Removing while Iterating a Collection Removing items from a collection in java while iterating over it I'm trying to loop through HashMap: Map<String, Integer> group0 = new HashMap<String, Integer>(); ... and extract every element in group0. This is my approach: // itera...
Hi all, How to move a particular HashMap entry to Last position? For Example, I have HashMap values like this: HashMap<String,Integer> map = new HashMap<String,Integer>(); map= {Not-Specified 1, test 2, testtest 3}; "Not-Specified" may come in any position. it may come first or in the middle of the map. But i want to move the "Not-...
I am trying to extend HashMap as a Parcelable and I got the syntax to compile, however, at runtime it throws an exception and returns a null pointer trying to un-marshal the data. The sender has to cast to (Parcelable) to resolve ambiguity, however, the receiver complains that is expected Parcelable but found HashMap. Has anyone been s...
Hi, I have a class representing a set of values that will be used as a key in maps. This class is immutable and I want to make it a singleton for every distinct set of values, using the static factory pattern. The goal is to prevent identical objects from being created many (100+) times and to optimize the equals method. I am looking ...
Hi Say I have two hashmaps: {dog=1, cat=1, sport=3, golf=4} {dog=5, person=1, animal=4} I want to merge them retaining the values, so that the values add together in the output Output: {dog=6, person=1, animal=4, cat=1, sport=3, golf=4} Notice how "dog" has a value of 6 (5+1) Using Hashmap.putAll(), the value of dog becomes 5, a...