Tag: HashMap
Posts of Tag: HashMap
  1. How to Sort a HashMap by Value in Java

    How to Sort a HashMap by Value in Java In this tutorial, we'll take a look at how to sort a HashMap by value in Java. Let's go ahead and create a simple HashMap: Map<String, Integer> unsortedMap = new Has...Learn More
    JavaSortingHashMap
  2. How to Sort a HashMap by Key in Java

    How to Sort a HashMap by Key in Java In this tutorial, we'll take a look at how to sort a HashMap by key in Java. Let's go ahead and create a simple HashMap: Map<String, Integer> unsortedMap = new HashMap...Learn More
    JavaSortingHashMap
  3. HashMap and TreeMap in Java: Differences and Similarities

    HashMap and TreeMap in Java: Differences and Similarities The performance of a Java program and the proper use of resources are often depend on a collection a developer chose for storing data. Hence, it is very...Learn More
    Data StructureJavaHashMapTreeMap
  4. Efficient way to prune HashMap

    I am creating a Flyweight in Java, and I want to make sure I don't create too large a map. Is there a more efficient way to prune the map? I did not see any properties that could do this automatically (like ...Learn More
    JavaHashMapPruning
  5. top -10 unique dictionary keys to be found on the basis of value

    Need to find out the top-10 dictionary key's on the basis of value.... value is a tuple of two fields.. { Key : (value1, value2) } So first, we have to find the list of key's on the basis of top 10 value1's a...Learn More
    PythonDictionaryHashMap
  6. How to turn a Ruby Hash into HTTP Params

    That is pretty easy with a plain hash like {:a =&gt; "a", :b =&gt; "b"} which would translate into "a=a&amp;b=b" but what do you do with something more complex like {:a =&gt; "a", :b =&...Learn More
    HTTPHashMapRubyParams
  7. Python dictionary ordering with equal keys

    I thought this must already have been answered, but I couldn't find anything on Google or here. I'm aware that, in general, you cannot rely on the ordering of a Python dictionary. However, if you have two dicti...Learn More
    PythonDictionaryHashMapfloating-point
  8. The difference between python dict and tr1::unordered_map in C++

    I have a question related to understanding of how python dictionaries work. I remember reading somewhere strings in python are immutable to allow hashing, and it is the same reason why one cannot directly use...Learn More
    PythonDictionaryHashMapc++tr1
  9. HashMap as a static member in java

    I want to carry a HashMap over as a static member for each instance of a new class. Every time I try to .get or.put into my HashMap, however, I get a NullPointerException. Help!? I'm doing: public class EmailA...Learn More
    JavaHashMapstatic-members
  10. Is there a hashmap library for JavaScript?

    In JavaScript, all Objects act a bit like hashmaps. However, the keys to these hashmaps must be strings. If they're not, they're converted with toString(). That means: var a = {foo: 1}; var b = {bar: 2}; var...Learn More
    JavaScriptHashMap
  11. Error converting JSON string to map in Java using Jackson

    I have this little piece of code, and I'm trying to convert a JSON string to a map. String json = "[{'code':':)','img':'&lt;img src=/faccine/sorriso.gif&gt;'}]"; ObjectMapper mapper = new ObjectMapper()...Learn More
    JavaJsonDictionaryHashMapjackson
  12. Getting URL value from HashMap in a JSP page (Using Struts2)

    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...Learn More
    JavaJSPHashMapstruts2