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1. Top results related to collection framework

   • Java collection not have Map as part of collection framework

     Top Answer

     Answered Aug 02, 2017 · 12 votes

     Maps work with key/value pairs, while the other collections work with just values. Map maps keys to values. It allows its content to be viewed as a set of keys, a collection of values and a set of key-value mappings.

     Check this following link. Answer by oracle. https://docs.oracle.com/javase/tutorial/collections/

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     1/5

   • Java collection framework which does not allow null and allows parallel access

     Top Answer

     Answered Apr 20, 2018 · 0 votes

     ConcurrentHashMap-

     There you go.

     For differences between HashTable and ConcurrentHashMap, I'd suggest you read ConcurrentHashMap and Hashtable in Java

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     2/5

   • java collection framework problem

     Top Answer

     Answered May 12, 2011 · 4 votes

     Have you looked at the documentation for Collections.sort

     ?

     Sorts the specified list into ascending order, according to the natural ordering of its elements. All elements in the list must implement the Comparable interface. Furthermore, all elements in the list must be mutually comparable (that is, e1.compareTo(e2) must not throw a ClassCastException for any elements e1 and e2 in the list).

     and

     Throws: ClassCastException - if the list contains elements that are not mutually comparable (for example, strings and integers).

     Does that help you? Basically in order to sort the list, sort has to compare StringBuilder values with each other - and there's no natural comparison declared in StringBuilder.

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     3/5

   • Which Collection framework to sort Objects

     Top Answer

     Answered May 08, 2013 · 1 votes

     .NET has several collection to do your task.

     List

     You can create a list with all your entities and sort them with the method Sort. Example how to sort on salary (assuming the fields are public):

     List<Emp> empCollection= new List<Emp>{ new Emp { sal = 1000, firstName = "Chris", lastName = "Bakker" }, new Emp { sal = 1500, firstName = "Bea", lastName = "Smith" }, // etc.};empCollection.Sort((a,b) => a.sal.CompareTo(b.sal));

     Pro's and con's:

     • Pro: You resort the collection on another key.
     • Con: Although the list is sorted, you cannot search through if faster on a key.

     SortedDictionary

     You could also use a SortedDictionary. A dictionary is a combination of keys and values. The value, in your case, will always be the employee. They key is the element you want the items to be sorted on. Example to sort on first name:

     SortedDictionary<string, Emp> empCollection= new SortedDictionary<string, Emp>{ {"Chris", new Emp { sal = 1000, firstName = "Chris", lastName = "Bakker" }}, {"Bea", new Emp { sal = 1500, firstName = "Bea", lastName = "Smith" }}, // etc.};

     Pro's and con's:

     • Pro: Once the list is sorted, queries by keys are pretty fast.
     • Con: You have to add the key seperately which feels like you are adding duplicate data.
     • Con: You cannot resort the collection on another key; you would have to create a new dictionary.

     LINQ

     You can use LINQ to create a newly created and sorted list:

     List<Emp> empCollection= new List<Emp>{ new Emp { sal = 1000, firstName = "Chris", lastName = "Bakker" }, new Emp { sal = 1500, firstName = "Bea", lastName = "Smith" }, // etc.};List<Emp> sortedEmpCollection = empCollection.OrderBy(e => e.lastName).ToList();

     Pro's and con's:

     • Pro: Syntax is easy to understand.
     • Con: A newly created list is created every time (more memory management).
     • Con: Although the list is sorted, you cannot search through if faster on a key.

     Check all answers on Stack Overflow

     4/5

   • Also try

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     collection framework in java javatpoint	java collection framework hierarchy diagram
     collection framework interview questions	gfg collection framework
     collection framework hierarchy	data collection framework

     5/5

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2. www.geeksforgeeks.org › collections-in-java-2Collections in Java - GeeksforGeeks

   www.geeksforgeeks.org › collections-in-java-2

   • Cached

   Mar 5, 2024 · Last Updated : 05 Mar, 2024. Any group of individual objects that are represented as a single unit is known as a Java Collection of Objects. In Java, a separate framework named the “Collection Framework” has been defined in JDK 1.2 which holds all the Java Collection Classes and Interface in it.

3. www.javatpoint.com › collections-in-javaCollections in Java - javatpoint

   www.javatpoint.com › collections-in-java

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   • Iterable Interface. The Iterable interface is the root interface for all the collection classes. The Collection interface extends the Iterable interface and therefore all the subclasses of Collection interface also implement the Iterable interface.
   • Collection Interface. The Collection interface is the interface which is implemented by all the classes in the collection framework. It declares the methods that every collection will have.
   • List Interface. List interface is the child interface of Collection interface. It inhibits a list type data structure in which we can store the ordered collection of objects.
   • ArrayList. The ArrayList class implements the List interface. It uses a dynamic array to store the duplicate element of different data types. The ArrayList class maintains the insertion order and is non-synchronized.

4. docs.oracle.com › guides › collectionsCollections Framework Overview - Oracle

   docs.oracle.com › guides › collections

   • Cached

   • Introduction. The Java platform includes a collections framework. A collectionis an object that represents a group of objects (such as the classic Vectorclass).
   • Collection Interfaces. The collection interfaces are divided into two groups. The most basic interface, java.util.Collection, has the following descendants
   • Collection Implementations. Classes that implement the collection interfaces typically have names in the form of . The general purpose implementations are summarized in the following table
   • Concurrent Collections. Applications that use collections from more than one thread must be carefully programmed. In general, this is known as concurrent programming.

5. People also ask

   What is collection framework in Java?

   • In Java, a separate framework named the “Collection Framework” has been defined in JDK 1.2 which holds all the Java Collection Classes and Interface in it. In Java, the Collection interface (java.util.Collection) and Map interface (java.util.Map) are the two main “root” interfaces of Java collection classes.

   Collections in Java - GeeksforGeeks

   www.geeksforgeeks.org/collections-in-java-2/

   See all results for this question

   Is collection a part of the collections framework?

   • Not, strictly speaking, a part of the collections framework, this feature was added to the Java platform at the same time as the collections framework and relies on some of the same infrastructure. The collection interfaces are divided into two groups. The most basic interface, java.util.Collection , has the following descendants:

   Collections Framework Overview - Oracle

   docs.oracle.com/javase/8/docs/technotes/guides/collections/overview.html

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   What interfaces are used in Java Collections Framework?

   • The Java Collections Framework provides several general-purpose implementations of the core interfaces: For the Set interface, HashSet is the most commonly used implementation. For the List interface, ArrayList is the most commonly used implementation. For the Map interface, HashMap is the most commonly used implementation.

   Java Collections Framework in Depth with Examples for Beginners

   www.javaguides.net/2018/08/collections-framework-in-java.html

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   How does a collection framework foster software reuse?

   • Fosters software reuse by providing a standard interface for collections and algorithms with which to manipulate them. Let us see the hierarchy of the Collection framework. The java.util package contains all the classes and interfaces for the Collection framework. The most basic interface, java.util.Collection.

   Java Collections Framework in Depth with Examples for Beginners

   www.javaguides.net/2018/08/collections-framework-in-java.html

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6. docs.oracle.com › java-collections-frameworkJava Collections Framework

   docs.oracle.com › java-collections-framework

   • Cached

   Overview. The Java Collections Framework consists of: Collection interfaces: Represent different types of collections, such as sets, lists, and maps. These interfaces form the basis of the framework. General-purpose implementations: Primary implementations of the collection interfaces.

7. www.programiz.com › java-programming › collectionsJava Collections Framework - Programiz

   www.programiz.com › java-programming › collections

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   • Interfaces of Collections FrameWork. The Java collections framework provides various interfaces. These interfaces include several methods to perform different operations on collections.
   • Java Collection Interface. The Collection interface is the root interface of the collections framework hierarchy. Java does not provide direct implementations of the Collection interface but provides implementations of its subinterfaces like List, Set, and Queue.
   • Subinterfaces of the Collection Interface. As mentioned earlier, the Collection interface includes subinterfaces that are implemented by Java classes. All the methods of the Collection interface are also present in its subinterfaces.
   • Java Map Interface. In Java, the Map interface allows elements to be stored in key/value pairs. Keys are unique names that can be used to access a particular element in a map.

8. en.wikipedia.org › wiki › Java_collections_frameworkJava collections framework - Wikipedia

   en.wikipedia.org › wiki › Java_collections_framework

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   The Java collections framework is a set of classes and interfaces that implement commonly reusable collection data structures. [1] Although referred to as a framework, it works in a manner of a library. The collections framework provides both interfaces that define various collections and classes that implement them.

9. www.javaguides.net › 2018 › 08Java Collections Framework in Depth with Examples for Beginners

   www.javaguides.net › 2018 › 08

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   Collection Framework defines several classes and interfaces to represent a group of objects as a single unit. Collections are used to store, retrieve, manipulate, and communicate aggregate data. Java Collections Framework - Full 3Hr Course. What is a Collections Framework?