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1. Top results related to 8 functions of dictionary in java

   • Dictionary of ArrayLists in Java

     Top Answer

     Answered Jun 05, 2012 · 2 votes

     Instead of ArrayList grades; you'd have to use ArrayList grades = new ArrayList();

     Yet better: ArrayList<Float> grades = new ArrayList<Float>(); //or use Double or Number

     Note that unlike C or C++ creating a variable doesn't create the object as well. In C++ you could imagine your code as ArrayList* grades; i.e. you'd just create the reference/pointer here.

     Additional thoughts:

     • Dictionary studentGrades; this will be initialized to null.
     • public void main(String[] args) that's not a valid main function since it would have to be static
     • if you have a public static void main(String[] args) you can't use this since you don't have an object instance in the static context
     • You can't instantiate Dictionary since it is abstract. Use one of its subclasses, e.g. new Hashtable<String, List<Float>>(), or a map, e.g. Map<String, List<Float> dictionary = new HashMap<String, List<Float>>();
     • Note that local primitive variables are also not initialized, so this could give you an error too: boolean res; In Java only class members are initialized, local variables are not.

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     1/5

   • Dictionary sorting of ArrayList of Arraylist in java

     Top Answer

     Answered Mar 23, 2019 · 2 votes

     Comparator functions that contain 1 or -1 are error prone.

     Instead, you should write it like this:

     public static int lexicographically(List<Integer> a, List<Integer> b) { for (int i = 0, end = Math.min(a.size(), b.size()); i < end; i++) { int res = Integer.compare(a.get(i), b.get(i)); if (res != 0) return res; } return Integer.compare(a.size(), b.size());}

     This style of writing comparator functions prevents various common mistakes, such as never returning 0.

     The most important pattern in this style is:

     • Compare by the first criterion.
     • If the given values differ, return the comparison result and be done.
     • Take the next criterion, continue with step 1.
     • If there are no criteria left, return 0.

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     2/5

   • Java 8 : how to extract a HashMap from a ArrayList of HashMap in Java 8 using streams?

     Top Answer

     Answered May 29, 2020 · 2 votes

     Here's complete example how to do it

     import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.stream.Collectors;-public class Main { public static void main(String[] args) { List<HashMap<String, String>> input = new ArrayList<>(); HashMap<String, String> subinput1 = new HashMap<>(); subinput1.put("name", "name1"); subinput1.put("rollno", "rollno1"); input.add(subinput1); HashMap<String, String> subinput2 = new HashMap<>(); subinput2.put("name", "name2"); subinput2.put("rollno", "rollno2"); input.add(subinput2); HashMap<String, HashMap<String, String>> result = (HashMap<String, HashMap<String, String>>) input.stream() .collect(Collectors.toMap(v -> (String) v.get("rollno"), e -> e)); System.out.println(result); }}

     It iterates over a collection of HashMaps, takes the key in which it should be stored in the result HashMap, then it creates a Map of Maps where the key is the "rollno" from the input map, and value is the input map itself.

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     3/5

   • Calculate value of text from a dictionary of words in Java 8

     Top Answer

     Answered Jul 07, 2015 · 1 votes

     If your dictionary keys are not lower case, you should create a lower-cased version and re-use it:

     /** * Create a copy of the dictionary with all keys in lower case. * @param lc a dictionary of lowercase words to their value * @param article the article to be evaluated */static Map<String, Double> convert(Map<String, Double> dictionary) { return dictionary.entrySet().stream() .collect(Collectors.toMap(e -> e.getKey().toLowerCase(), Map.Entry::getValue, (p, q) -> p + q));}

     Then, for each article, you can quickly compute a value using a stream pipeline:

     /** * Compute the value of an article. * @param lc a dictionary of lowercase words to their value * @param article the article to be evaluated */static double evaluate(Map<String, Double> lc, Article article){ return Stream.of(article.getTitle(), article.getAbstractText(), article.getText()) .flatMap(s -> Arrays.stream(s.toLowerCase().split(" "))) .mapToDouble(k -> lc.getOrDefault(k, 0D)) .sum();}

     For more flexibility in folding words together, you could use a Collator

     to index with a CollationKey rather than lowercase words. A similar enhancement could be made for tokenizing the text, rather than simply splitting on spaces.

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     4/5

   • Java equivalent of apply functions in R

     Top Answer

     Answered Dec 21, 2015 · 1 votes

     The functional additions in Java 8 should address your concerns.

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     5/5

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8. People also ask

   What is a dictionary in Java?

   • Every value present in the object corresponds to a key. These keys are used to access values from the object. The object which stores these key value pairs is known as Dictionary. There are several ways to define a dictionary or add a new key-value pair in existing dictionary objects. Let’s see each of them one by one.

   7 Examples to Grasp Python Key Value Pair - Python Pool

   www.pythonpool.com/python-key-value-pair/

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   What are the functions of the Dictionary?

   • The dictionary is initialized empty; you can insert and query key-value pairs for your custom handlers and special processing. Gets or sets proxy information used by the handler. Gets or sets a time-out in milliseconds when writing a request to or reading a response from a server. Gets or sets a callback method to validate the server certificate.

   WebRequestHandler Class (System.Net.Http) | Microsoft Learn

   learn.microsoft.com/en-us/dotnet/api/system.net.http.webrequesthandler?view=netframework-4.8

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   How to use dictionaries with functions?

   • A fine example of using Dictionaries with functions is demonstrated below by making a simple calculator which can compute basic mathematical functions such as addition subtraction, multiplication and division. Depending on User’s choice one can proceed with the earlier calculation or begin with a fresh one.

   Making a Simple Calculator using Dictionaries with Functions in Python

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