dictionary assignment java

How to create a dictionary in Java

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A Java dictionary is an abstract class that stores key-value pairs. Given a key, its corresponding value can be stored and retrieved as needed; thus, a dictionary is a list of key-value pairs.

The Dictionary object classes are implemented in java.util .

Creating a dictionary

The first step to creating a dictionary in Java is to choose a class that implements a “key-value pair” interface; a few examples include HashTables , HashMap , and LinkedHashMap .

The declaration and initialization of a dictionary follows the syntax below:

The code snippet below illustrates how to create a dictionary in Java and the usage of a few of the class’s methods:

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Java.util.Dictionary Class in Java

The java.util.Dictionary class in Java is an abstract class that represents a collection of key-value pairs, where keys are unique and are used to access the values. It was part of the Java Collections Framework introduced in Java 1.2 but has been largely replaced by the java.util.Map interface since Java 1.2.

The Dictionary class is an abstract class and cannot be instantiated directly. Instead, it provides the basic operations for accessing the key-value pairs stored in the collection, which are implemented by its concrete subclass java.util.Hashtable.

The Dictionary class defines the following methods:

• 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.
• size(): Returns the number of key-value pairs stored in the dictionary.
• isEmpty(): Returns true if the dictionary is empty, and false otherwise. elements(): Returns an enumeration of the values stored in the dictionary.
• keys(): Returns an enumeration of the keys stored in the dictionary.

Here’s an example of using the Dictionary class:

util.Dictionary is an abstract class, representing a key-value relation 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 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. This is because it was designed prior to the introduction of the Collections framework and does not implement the Map interface, which makes it difficult to use in conjunction with other parts of the framework.

In general, it’s recommended to use the Map interface or one of its implementations (such as HashMap or ConcurrentHashMap) instead of the Dictionary class.

Here’s an example of how to use the Dictionary class:

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.

2. elements() : java.util.Dictionary.elements() returns value representation in dictionary.

3. get(Object key) : java.util.Dictionary.get(Object key) returns the value that is mapped with the argumented key in the dictionary.

4. isEmpty() : java.util.Dictionary.isEmpty() checks whether the dictionary is empty or not. 

5. keys() : java.util.Dictionary.keys() returns key representation in dictionary.

6. remove(Object key) : java.util.Dictionary.remove(Object key) removes the key-value pair mapped with the argumented key. 

7. size() : java.util.Dictionary.size() returns the no. of key-value pairs in the Dictionary.

Output:  

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Advantages of Dictionary class:

• 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, you can still use it in your new code.
• 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.

Disadvantages of Dictionary class:

• 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 implement the Map interface, which makes it difficult to use in conjunction with other parts of the framework.
• 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 its implementations.
• 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.

Reference books:

• “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.

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How to create a dictionary in Java

Dictionary data structure, dictionary class and its extension, hashmap as a dictionary.

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Programming & Frameworks

Dictionary in Java is the abstract class that is the parent of any class which uses the key-value pair relationship. In this blog, we will learn more about the Dictionary class in Java and get familiar with the different methods. Below are the topics covered in this blog-

What is Dictionary in Java?

• Methods of util.Dictionary Class

Check the size of the dictionary

Add/ put values in dictionary, return values present in the dictionary, get method to fetch the values mapped with the key.

• Check if the dictionary is empty
• Removing key value from the dictionary

Implementation of Dictionary in Java

Dictionary is an abstract class representing a key/value storage repository that operates like Map . You can store the value in a Dictionary object and once it is stored, you can retrieve it by using its key.

Declaration:

public abstract class Dictionary extends Object

Constructor:

Dictionary() constructor

Methods of util.Dictionary Class 

Let us have a look at a few different methods of Dictionary Class.

size() : java.util.Dictionary.size() returns the number of key-value pairs in the Dictionary

Syntax: public abstract int size()

put(K key, V value) : java.util.Dictionary.put(K key, V value) adds key-value pair to the dictionary

Syntax: public abstract V put(K key, V value)

elements() : java.util.Dictionary.elements() returns value representation in dictionary

Syntax: public abstract Enumeration elements()

get(Object key) : java.util.Dictionary.get(Object key) returns the value that is mapped with the key in the dictionary

Syntax: public abstract V get(Object key)

Check if dictionary is empty

isEmpty() : java.util.Dictionary.isEmpty() checks whether the dictionary is empty or not.

Syntax: public abstract boolean isEmpty()

Return true, if there is no key-value relation in the dictionary; else return false.

Removing key value from dictionary in Java

remove(Object key) : java.util.Dictionary.remove(Object key) removes the key-value pair mapped with the key.

Syntax: public abstract V remove(Object key)

Value in Dictionary : Edureka Value in Dictionary : Platform Value at key = 3000 : null Value at key = 1000 : Platform There is no key-value pair : false Keys in Dictionary : 1000 Keys in Dictionary : 2000 Remove : Edureka Check the value of removed key : null Size of Dictionary : 1

With this, we come to the end of this blog on the Java Dictionary Class. If you wish to learn more, check out the Java Certification Training by Edureka, a trusted online learning company with a network of more than 250,000 satisfied learners spread across the globe. Edureka’s Java J2EE and SOA training and certification course is designed for students and professionals who want to be a Java Developer. The course is designed to give you a head start into Java programming and train you for both core and advanced Java concepts along with various Java frameworks like Hibernate & Spring .

Got a question for us? Please mention it in the comments section of this “Dictionary in Java” blog and we will get back to you as soon as possible.

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Computer Science 245: Data Structures and Algorithms

• Lecture Notes
• Dictionary() Constructor that creates an empty dictionary.
• Dictionary(String filename) Constructor that reads in a list of words from a file. You can assume that the file contains one word per line. Feel free to use java.util.scanner to help out with this. I only needed to use the hasNext() and nextLine() methods.
• void add(String word) Add word to the dictionary.
• boolean check(String word) Check to see if word is in the dictionary. This check should be case-insensitive!
• checkPrefix(String prefix) Check to see if the string prefix is a prefix of any word in the dictionary. This check should be case-insensitive!
• String suggest(String word)} Return an element in the dictionary as close as possible to word. If word is in the dictionary, then return word. If word is not in the dictionary, return the word that is "closest" in the dictionary.

• The methods add and check can be performed in constant time (with respect to the number of words in the dictionary -- both these operations are linear in the length of the word being added or checked)
• Suggest can be done (relatively) easily
• Determining if a string is a valid prefix of some word can be done in constant time (relative to the size of the dictionary)

To see more examples of a trie in action, take a look at the Trie Visualization .

Dictionary Implementation Details

Finding a word.

Finding a Prefix

Adding a word, removing a word, printing the dictionary, indexing child array.

• The word must be at least three letters long.
• The path traced out by the letters in the word must be connected horizontally, vertically, or diagonally. You can't skip over intervening cubes to get the next letter.
• Each cube may be used only once in a given word.

Computer Boggle

Provided files.

• Make sure it has at least 3 letters (many words in the provided dictionary have 2 or fewer letters!)
• Make sure it is in the dictionary
• Make sure it can be formed on the board
• playerMove The set of all words in the players guess
• computerMove An output parameter, the moves made by the computer. This should be a set of all words that can be found in the board that are not in the set playerMove
• Start with a letter, and start searching, keeping track of the word you are building up
• When you create a word (that is, the word that you've built up so far is in the dictionary) add it to a set of all generated words, and go on.
• If the word so far is not a prefix of any valid word (the Dictionary method checkPrefix is your friend here), you can stop
• Keep track of which positions you have used, so you don't reuse them. Note that only the tiles in the current word you are buiding up should be marked as used -- as you backtrack, you will need to modify your markings of which tiles are used.

Support Files

• Dictionary Documentation
• BoardGUI.java The main file for the Boggle game. You shouldn't need to change this ( documentation )
• BoggleDie.java A class to handle a single Boggle die. You shouldn't need to change this
• Board.java A class to handle a boggle board. This is the file that you need to add the funtions validGuess and computerMove to. The stubs are already there, just fill them in (and add any helper methods that you need. You will need to add helper methods. ( documentation )
• Output for Boggle for original board: output
• add: 15 points
• check: 10 points
• checkPrefix: 5 points
• suggest: 15 points
• remove: 15 points
• constructors and misc. other: 5 points
• validGuess: 15 points
• computerMove: 20 points

Collaboration

Project submission.

How to use Dictionary in java.util

Best java code snippets using java.util . dictionary (showing top 20 results out of 11,043), refine search.

• BundleContext
• Enumeration
• ComponentContext
• ConfigurationAdmin
• Configuration
• ConfigurationException

  Assignment of Dictionary Types and Java Types  

The following tables show the assignments of runtime-dependent Dictionary types and the corresponding Java types in Web Dynpro for Java .

Predefined Dictionary Types

Dictionary types for web dynpro ui elements.