Yahoo Web Search

Search results

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

   • 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.

     Check all answers on Stack Overflow

     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.

     Check all answers on Stack Overflow

     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.

     Check all answers on Stack Overflow

     3/5

   • 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.

     Check all answers on Stack Overflow

     4/5

   • 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.

     Check all answers on Stack Overflow

     5/5

   Show moreShow less

2. stackoverflow.com › questions › 78582705java - How to extract pdf data and make a dictionary on it ...

   stackoverflow.com › questions › 78582705

   • Cached

   22 hours ago · I have a relatively large (35 MB) pdf file in the form of a specialized dictionary from which I want to make a dictionary app. Considering the large volume of this file, is it possible to first extract the data from it (SQLite) and then make a dictionary using data? java.

3. www.geeksforgeeks.org › java-util-dictionary-classJava.util.Dictionary Class in Java - GeeksforGeeks

   www.geeksforgeeks.org › java-util-dictionary-class

   • Cached

   • The Dictionary Class Defines The Following Methods
   • Here’s An Example of Using The Dictionary Class
   • Here’s An Example of How to Use The Dictionary Class
   • Advantages of Dictionary Class
   • Disadvantages of Dictionary Class
   • Reference Books

   get(Object key): Returns the value associated with the specified key in the dictionary, or null if the key is not found.

   put(Object key, Object value): Inserts a key-value pair into the dictionary. If the key already exists, its corresponding value is

   replaced with the new value, and the old value is returned. If the key is new, null is returned.

   remove(Object key): Removes the key-value pair associated with the specified key from the dictionary, and returns its value. If the key is not found, null is returned.

   See full list on geeksforgeeks.org

   util.Dictionary is an abstract class, representing a key-valuerelation and works similar to a map. Given a key you can store values and when needed can retrieve the value back using its key. Thus, it is a list of key-value pair. Declaration Constructors: Dictionary()Sole constructor. The java.util.Dictionary class is a class in Java that provides a...

   See full list on geeksforgeeks.org

   Methods of util.Dictionary Class : 1. put(K key, V value) : java.util.Dictionary.put(K key, V value)adds key-value pair to the dictionary. Syntax : 2. elements() : java.util.Dictionary.elements()returns value representation in dictionary. Syntax : 3. get(Object key) : java.util.Dictionary.get(Object key) returns the value that is mapped with the ar...

   See full list on geeksforgeeks.org

   Legacy Support: The Dictionary class was part of the original Java Collections framework and has been part of Java since the beginning. This means that if you have legacy code that uses Dictionary,...

   Simple to use: The Dictionary class is simple to use and provides basic key-value data structure functionality, which can be useful for simple cases.

   See full list on geeksforgeeks.org

   Obsolete: The Dictionary class is considered obsolete and its use is generally discouraged. This is because it was designed prior to the introduction of the Collections framework and does not imple...

   Limited functionality: The Dictionary class provides basic key-value data structure functionality, but does not provide the full range of functionality that is available in the Map interface and it...

   Not type-safe: The Dictionary class uses the Object class to represent both keys and values, which can lead to type mismatches and runtime errors.

   See full list on geeksforgeeks.org

   “Java Collections” by Maurice Naftalin and Philip Wadler. This book provides a comprehensive overview of the Java Collections framework, including the Dictionary class.

   “Java in a Nutshell” by David Flanagan. This book provides a quick reference for the core features of Java, including the Dictionary class.

   “Java Generics and Collections” by Maurice Naftalin and Philip Wadler. This book provides a comprehensive guide to generics and collections in Java, including the Dictionary class.

   See full list on geeksforgeeks.org

4. courses.cs.washington.edu › 6_DictionaryLecture 6: Dictionary ADT

   courses.cs.washington.edu › 6_Dictionary

   Dictionary: Applications Any time you want to store information according to some key and be able to retrieve it efficiently - Dictionary is the ADT to use! •Lots of programs do that! •Networks: router tables •Operating systems: page tables •Compilers: symbol tables •Databases: dictionaries with other nice properties

5. web.engr.oregonstate.edu › Chapter12Chapter 12: Dictionary (Hash Tables) - College of Engineering

   web.engr.oregonstate.edu › Chapter12

   Maps or dictionaries are useful in any type of application where further information is associated with a given key. Obvious examples include dictionaries of word/definition pairs, telephone books of name/number pairs, or calendars of date/event-description pairs.

   • File Size: 117KB

   • Page Count: 15

6. thelinuxcode.com › create-a-dictionary-in-javaThe Complete Guide to Effectively Using Dictionaries in Java

   thelinuxcode.com › create-a-dictionary-in-java

   • Cached

   Dec 27, 2023 · Alternative dictionary types like TreeMap and ConcurrentHashMap; Sorting, ordering and handling null values; Dictionary performance benchmarking and optimization; Persistence through serialization and JSON; Common mistakes and best practices when using dictionaries; And much more! Let‘s get started. What is a Dictionary in Java?

7. docs.oracle.com › javase › 8Uses of Class java.util.Dictionary (Java Platform SE 8 ) - Oracle

   docs.oracle.com › javase › 8

   • Cached

   Packages that use Dictionary. Provides the classes and interfaces for the security framework. Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).

8. People also ask

   What is a dictionary in Java?

   • Dictionary () Sole constructor. The java.util.Dictionary class is a class in Java that provides a key-value data structure, similar to the Map interface. It was part of the original Java Collections framework and was introduced in Java 1.0. However, the Dictionary class has since been considered obsolete and its use is generally discouraged.

   Java.util.Dictionary Class in Java - GeeksforGeeks

   www.geeksforgeeks.org/java-util-dictionary-class-java/

   See all results for this question

   What is an example of a dictionary?

   • Obvious examples include dictionaries of word/definition pairs, telephone books of name/number pairs, or calendars of date/event-description pairs. Dictionaries are used frequently in analysis of printed text. For example, a concordance examines each word in a text, and constructs a list indicating on which line each word appears.

   Chapter 12: Dictionary (Hash Tables) - College of Engineering

   web.engr.oregonstate.edu/~sinisa/courses/OSU/CS261/CS261_Textbook/Chapter12.pdf

   See all results for this question

   How do you implement a dictionary?

   • Another approach to implementing the Dictionary is to use a pair of parallel dynamic arrays. One array will maintain the keys, and the other one will maintain the values, which are stored in the corresponding positions.

   Chapter 12: Dictionary (Hash Tables) - College of Engineering

   web.engr.oregonstate.edu/~sinisa/courses/OSU/CS261/CS261_Textbook/Chapter12.pdf

   See all results for this question

   What is the difference between a dictionary and a data type?

   • In a dictionary, on the other hand, we separate the data into two parts. Each item stored in a dictionary is represented by a key/value pair. The key is used to access the item. With the key you can access the value, which typically has more information. The name itself suggests the metaphor used to understand this abstract data type.

   Chapter 12: Dictionary (Hash Tables) - College of Engineering

   web.engr.oregonstate.edu/~sinisa/courses/OSU/CS261/CS261_Textbook/Chapter12.pdf

   See all results for this question

9. cs.brown.edu › cgc › java3Hash Functions and Hash Tables (§ 8.2) Example

   cs.brown.edu › cgc › java3

   A hash function is usually specified as the composition of two functions: Hash code: h1:keys→integers Compression function: h2: integers →[0, N−1] The hash code is applied first, and the compression function is applied next on the result, i.e., .