When I iterate over the values or keys are they going to correlate? Will the second key map to the second value?
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My problem is actually more nuanced than the question suggests, but wanted to keep the header brief.
I have a HashMap<String, File> of File objects as values. The keys are String name ... |
I have an application which displays a collection of objects in rows, one object = one row. The objects are stored in a HashMap. The order of the rows does not ... |
I am trying figure out the order in which the values in a HashMap are/can be retrieved. Heres the code snippet for the same.
import java.util.HashMap;
public class HashMapExample {
...
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I was wondering how Java orders items in the Map (HashMap or Hashtable) when they are added. Are the keys ordered by the hashcode, memory reference or by allocation precedence...?
It's because ... |
I have this HashMap that I need to print out in ascending order according to the values contained in it (not the keys).
But the order when I print it out ... |
I have a HashMap<Object, Student> where the Object is the ID of the Student, and the Student is an object from Student.
How can I resort the HashMap by the Students name, ... |
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Here is my code to store the data into HashMap and display the data using iterator
public static void main(String args[]){
HashMap<String, String> hm = new HashMap<String, String>();
hm.put("aaa", "111");
hm.put("bbb", "222");
hm.put("ccc", "333");
hm.put("ddd", "444");
hm.put("eee", ...
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My Map contains keys sorted in alphabetical order. When I display it, I'm using entrySet().iterator(), but my results are not in the alphabetical order.
How can I get my results in order?
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How can I sort HashMap keys by their numerical value? Currently, in the natural ordering it looks like this:
1 10 13 2 26 29
I want it to look like this:
29 26 ...
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hi, A hashmap is a form attribute(say mapObject) and contains two key value pairs,say{(a,0),(b,0)}.....sorted i am displaying the key in jsp by: o/p: b a ok,modify the map.........{(a,0),(b,0),(c,0)} o/p: b c a its seems that the key is picked from the map randomly,although its sorted there. can anyone throw light?? |
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Dear All, I am getting some column names from database like Request_id,Name,Address,Request_status. Now i am putting the above values as key in a hash Map. When i display the hash Map the order it is showing as Name,Address,Request_status,Request_id. My requirement is i want the Request_id at first in hash map when displaying. Is there any way to do that. I have ... |
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Here again: the input is a few pairs of integer,double values like 1, 1.1 2, 2.3 3. 1.3 What I want to do is sort them descendingly and the result should be like this: 2, 2.3 3, 1.3 1, 1.1 The reason I want to do this that I have generated predictions for a butch of items and now I need ... |
I think Jos has a point... if you're iterating the map yourself then don't... If you require the map values in the order specified by an existing list of keys (i.e. an index) then you just need to iterate the list of keys, and grab each value from the map... which is all fast (for a hash map). @Jos: Is that ... |
Hi all Until now in my program i use a HashMap collection to store my objects. The problem i have now is that the objects are too many (over 1.000.000) so keeping them in memory in a hashmap collection is impossible. So the solution (?) is to keep them in a file and retrieve the objects i want from the file ... |
I would like it to sort the objects based on the value from MyObject.getName(), as was previously stored in the HashMap. How would it automagically know to do this? I have looked at the Comparable interface and it seems I may be able to program it to do it this way? Am i on the right track here? :P |
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