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1. Top results related to major features 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

   • 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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     3/5

   • 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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     4/5

   • How to declare Dictionary of Dictionary in java

     Top Answer

     Answered Apr 15, 2021 · 1 votes

     It's like in C# except with the word HashMap rather than Dictionary

     HashMap<String, HashMap<String, String>>-

     Map<String, String> mapA = new HashMap<String, String>();Map<String, mapA> map = new HashMap<String, mapA>();

     No, because mapA is an instance, not a type. That wouldn't work in C# either

     //novar d = new Dictionary<string, string>();var e = new Dictionary<string, d>(); //error: `d` is a variable, but is used like a type

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     5/5

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2. 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/

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   How to add a key to a dictionary in Java?

   • Some of the important methods are: put (Object key, Object value): This method adds a key-value pair to the dictionary. If the key already exists in the dictionary, the value associated with the key is replaced with the new value. get (Object key): This method returns the value associated with the specified key.

   Dictionary Class in Java - Java To The Point

   javatothepoint.com/dictionary-class-in-java/

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   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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   What is a dictionary class?

   • The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values. Every key and every value is an object. In any one Dictionary object, every key is associated with at most one value. Given a Dictionary and a key, the associated element can be looked up.

   Dictionary (Java SE 21 & JDK 21)

   docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Dictionary.html

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

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

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   Apr 9, 2023 · 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.

4. www.javatpoint.com › dictionary-class-in-javaDictionary Class in Java - Javatpoint

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

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   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 Java Dictionary class that stores data in key-value pairs just like the Map interface.

5. docs.oracle.com › java › utilDictionary (Java SE 21 & JDK 21) - docs.oracle.com

   docs.oracle.com › java › util

   • Cached

   The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values. Every key and every value is an object. In any one Dictionary object, every key is associated with at most one value. Given a Dictionary and a key, the associated element can be looked up.

6. javatothepoint.com › dictionary-class-in-javaDictionary Class in Java - Java To The Point

   javatothepoint.com › dictionary-class-in-java

   • Cached

   May 10, 2023 · Features of Dictionary Class. The Dictionary class provides methods for adding, removing, and retrieving key-value pairs. Some of the important methods are: put (Object key, Object value): This method adds a key-value pair to the dictionary.

7. 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 · Dictionaries are a fundamental data structure in programming used to map keys to values for efficient lookup and organization. Mastering dictionaries is key to writing optimized Java code. In this comprehensive guide, you‘ll learn all about dictionaries and how to leverage them in your Java programs like a pro! We‘ll cover: What dictionaries are and … The Complete Guide to Effectively ...

8. www.edureka.co › blog › dictionary-in-javaWhat is Dictionary in Java and How to Create it? - Edureka

   www.edureka.co › blog › dictionary-in-java

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   Jun 17, 2021 · What is 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.

9. docs.oracle.com › util › class-useUses of Class java.util.Dictionary (Java Platform SE 8 ) - Oracle

   docs.oracle.com › util › class-use

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   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).