Below are the values contain in the HashMap statusName {Active=33, Renewals Completed=3, Application=15} Java code to getting the first Key (i.e Active) Object myKey = statusName.keySet().toArray()[0]; How can we collect the first Key “Value” (i.e 33), I want to store both the “Key” and “Value” in separate variable. 11 Answers 11
Apart from the fact that HashSet does not allow duplicate values, what is the difference between HashMap and HashSet? I mean implementation wise? It’s a little bit vague because both use hash tables to store values. 20 Answers 20
I can think of several reasons why HashMaps with integer keys are much better than SparseArrays: The Android documentation for a SparseArray says “It is generally slower than a traditional HashMap“. If you write code using HashMaps rather than SparseArrays your code will work with other implementations of Map and you will be able to … Read more
This question already has answers here: JavaScript hashmap equivalent (17 answers) Closed 6 years ago. How can you create the JavaScript/JQuery equivalent of this Java code: Map map = new HashMap(); //Doesn’t not have to be a hash map, any key/value map is fine map.put(myKey1, myObj1); map.put(myKey2, myObj2); //Repeat n times function Object get(k) { … Read more
I want to implement a HashMap in Python. I want to ask a user for an input. depending on his input I am retrieving some information from the HashMap. If the user enters a key of the HashMap, I would like to retrieve the corresponding value. How do I implement this functionality in Python? HashMap<String,String> … Read more
Convert this Array: a = [“item 1”, “item 2”, “item 3”, “item 4”] …to a Hash: { “item 1” => “item 2”, “item 3” => “item 4” } i.e. elements at even indexes are keys and odd ones are values. 9 Answers 9
I’ll admit that I’m a bit of a ruby newbie (writing rake scripts, now). In most languages, copy constructors are easy to find. Half an hour of searching didn’t find it in ruby. I want to create a copy of the hash so that I can modify it without affecting the original instance. Some expected … Read more
That is pretty easy with a plain hash like {:a => “a”, :b => “b”} which would translate into “a=a&b=b” But what do you do with something more complex like {:a => “a”, :b => [“c”, “d”, “e”]} which should translate into “a=a&b[0]=c&b[1]=d&b[2]=e” Or even worse, (what to do) with something like: {:a => “a”, … Read more
How can I create and fetch associative arrays in Java like I can in PHP? For example: $arr[0][‘name’] = ‘demo’; $arr[0][‘fname’] = ‘fdemo’; $arr[1][‘name’] = ‘test’; $arr[1][‘fname’] = ‘fname’; 15 Answers 15
I know that STL has a HashMap API, but I cannot find any good and thorough documentation with good examples regarding this. Any good examples will be appreciated. 5 Answers 5
