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1. Top results related to define delineation dictionary in java

   • Dictionary in java using hashmap

     Top Answer

     Answered Apr 19, 2013 · 0 votes

     I assume that by saying "display the name and the number", you want to display all contacts stored in the phone. So the quesiton seems like how to print all elements in a hashmap.

     for(String name : map.keySet()){ System.out.println("name is " + name); System.out.println("contact is " + map.get(name));}-

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     1/5

   • 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

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     2/5

   • 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

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     3/5

   • Dictionary isEmpty() Method in Java

     The isEmpty() method of Dictionary Class checks whether this dictionary has any key-value mappings or not. The function returns TRUE only if there is no entry in this dictionary.

     Syntax:

     public abstract boolean isEmpty()

     Return Value: The function returns TRUE if the dictionary is empty and FALSE otherwise.

     Exception: The function throws no exception.

     Below programs illustrate the use of Dictionary.isEmpty() method:

     Program 1:

     // Java Program to illustrate // Dictionary.isEmpty() method   import java.util.*;   class GFG {     public static void main(String[] args)     {           // Create a new hashtable         Dictionary<Integer, String>             d = new Hashtable<Integer, String>();           // Insert elements in the hashtable         d.put(1, "Geeks");         d.put(2, "for");         d.put(3, "Geeks");           // Print the Dictionary         System.out.println("\nDictionary: " + d);           // check if this dictionary is empty         // using isEmpty() method         if (d.isEmpty()) {             System.out.println("Dictionary "                               + "is empty");         }         else            System.out.println("Dictionary "                               + "is not empty");     } }

     -Dictionary: {3=Geeks, 2=for, 1=Geeks}Dictionary is not empty

     Program 2:

     // Java Program to illustrate // Dictionary.isEmpty() method   import java.util.*;   class GFG {     public static void main(String[] args)     {           // Create a new hashtable         Dictionary<String, String>             d = new Hashtable<String, String>();           // Print the Dictionary System.out.println nDictionary...

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     4/5

   • Dictionary remove() Method in Java

     The remove() method of Dictionary Class accepts a key as a parameter and removes the corresponding value mapped to the key.

     Syntax:

     public abstract V remove(Object key)

     Parameters: The function accepts a parameter key which denotes the key which is to be removed from the dictionary along with its mappings.

     Return Values: The function returns the value which was mapped to the key or returns NULL if the key had no mapping.

     Exception: The function throws no NullPointerException if the key passed as parameter is NULL.

     Below programs illustrate the use of java.util.Dictionary.remove() method:

     Program 1:

     // Java Program to illustrate // java.util.Dictionary.remove() method   import java.util.*;   class GFG {     public static void main(String[] args)     {         // Create a new hashtable         Dictionary<Integer, String>             d = new Hashtable<Integer, String>();           // Insert elements in the hashtable         d.put(1, "Geeks");         d.put(2, "for");         d.put(3, "Geeks");           // Print the Dictionary         System.out.println("\nDictionary: " + d);           // Display the removed value         System.out.println(d.remove(3)                            + " has been removed");           // Print the Dictionary         System.out.println("\nDictionary: " + d);     } }

     -Dictionary: {3=Geeks, 2=for, 1=Geeks}Geeks has been removedDictionary: {2=for, 1=Geeks}

     Program 2:

     Java Program to illustrate...

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     5/5

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2. www.geeksforgeeks.org · java-util-dictionary-classJava.util.Dictionary Class in Java - GeeksforGeeks

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

   

   Apr 9, 2023 · 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.

3. Videos

   • 

     11:44

     YouTube

     Implementing Dictionaries using the Map Interface in Java

     Jun 16, 2017

     19.1K Views

   • 

     5:38

     Study.com

     The Java Dictionary Class: Definition & Example

     Sep 14, 2021

     20K Views

   • 

     9:04

     YouTube

     # 105 Java - The Dictionary Class | Java.util.Dictionary Class | Java.util.Dictionary Class in Java

     Apr 26, 2021

     3K Views

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4. Searches related to define delineation dictionary in java

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5. stackoverflow.com · questions · 13543457How do you create a dictionary in Java? - Stack Overflow

   stackoverflow.com · questions · 13543457

   

   This creates dictionary of text (string): Map<String, String> dictionary = new HashMap<String, String>(); you then use it as a: dictionary.put("key", "value"); String value = dictionary.get("key"); Works but gives an error you need to keep the constructor class same as the declaration class.

6. docs.oracle.com · api · javaDictionary (Java Platform SE 8 ) - Oracle

   docs.oracle.com · api · java

   

   • size. public abstract int size() Returns the number of entries (distinct keys) in this dictionary. Returns: the number of keys in this dictionary.
   • isEmpty. public abstract boolean isEmpty() Tests if this dictionary maps no keys to value. The general contract for the isEmpty method is that the result is true if and only if this dictionary contains no entries.
   • keys. public abstract Enumeration keys() Returns an enumeration of the keys in this dictionary. The general contract for the keys method is that an Enumeration object is returned that will generate all the keys for which this dictionary contains entries.
   • elements. public abstract Enumeration elements() Returns an enumeration of the values in this dictionary. The general contract for the elements method is that an Enumeration is returned that will generate all the elements contained in entries in this dictionary.

7. www.javatpoint.com · dictionary-class-in-javaDictionary Class in Java - Javatpoint

   www.javatpoint.com · dictionary-class-in-java

   

   In Java, Dictionary is the list of key-value pairs. We can store, retrieve, remove, get, and put values in the dictionary by using the Java Dictionary class. In this section, we will discuss the JavaDictionary class that stores data in key-value pairs just like the Map interface.

8. codegym.cc · how-to-create-a-dictionary-in-javaHow to create a dictionary in Java - CodeGym

   codegym.cc · how-to-create-a-dictionary-in-java

   

   Jan 12, 2022 · If you need to create a dictionary in a Java program, the most logical way to solve this problem is to use the dictionary data structure. This data structure allows you to store information in the form "key - value". Java has a special Dictionary class as well as its descendant, Hashtable.

9. codersathi.com · dictionary-class-in-javaDictionary Class in Java - CoderSathi

   codersathi.com · dictionary-class-in-java

   

   Mar 28, 2021 · The Dictionary class serves as a foundation for creating associative data structures in Java. Associative data structures, also known as dictionaries or maps, allow us to store values (the “values”) associated with unique identifiers (the “keys”).

10. People also ask

    What is a dictionary class in Java?

    • 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.

    Java.util.Dictionary Class in Java - GeeksforGeeks

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

    See all results for this question

    Why is the Dictionary class no longer used in Java?

    • According to Java documentation, the Dictionary class is no longer in use because it is outdated. Instead of the Dictionary class, the HashMap class is used. Since we can say that HashMap is a type of dictionary.

    Dictionary Class in Java - Javatpoint

    www.javatpoint.com/dictionary-class-in-java

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    How to create a dictionary in Java?

    • So there are many ways to create a Java dictionary. So, the Dictionary data structure stores information as a key-value combination. That is, with any value we associate a key (it can be, for example, id) and enter this pair into the dictionary. Addressing an element of the dictionary, deleting, searching in the dictionary is performed by the key.

    How to create a dictionary in Java - CodeGym

    codegym.cc/groups/posts/how-to-create-a-dictionary-in-java

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    How to organize a dictionary in Java?

    • Addressing an element of the dictionary, deleting, searching in the dictionary is performed by the key. It seems convenient to organize using such data structure, for example, a telephone book, where the name (key) corresponds to the phone number (value). To begin with, java.util.Dictionary util.Dictionary is an abstract class.

    How to create a dictionary in Java - CodeGym

    codegym.cc/groups/posts/how-to-create-a-dictionary-in-java

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11. www.javatpoint.com · difference-betweenDifference between Declaration and Definition - javatpoint

    www.javatpoint.com · difference-between

    

    What is Declaration? Declarations are used to give program names, including variables, namespaces, functions, and classes. A name may not be utilized in a program until it is declared. In contrast to the definition, program items can be declared many times.