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Iterator interface. The Collection in Java is a framework that provides an architecture to store and manipulate the group of objects. Java Collections can achieve all the operations that you perform on a data such as searching, sorting, insertion, manipulation, and deletion. Java Collection means a single unit of objects.
- 17 min
- Iterable Interface: This is the root interface for the entire collection framework. The collection interface extends the iterable interface. Therefore, inherently, all the interfaces and classes implement this interface.
- Collection Interface: This interface extends the iterable interface and is implemented by all the classes in the collection framework. This interface contains all the basic methods which every collection has like adding the data into the collection, removing the data, clearing the data, etc.
- List Interface: This is a child interface of the collection interface. This interface is dedicated to the data of the list type in which we can store all the ordered collection of the objects.
- Queue Interface: As the name suggests, a queue interface maintains the FIFO(First In First Out) order similar to a real-world queue line. This interface is dedicated to storing all the elements where the order of the elements matter.
- 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.
- size. int size() Returns the number of elements in this collection. If this collection contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.
- isEmpty. boolean isEmpty() Returns true if this collection contains no elements. Returns: true if this collection contains no elements.
- contains. boolean contains(Object o) Returns true if this collection contains the specified element. More formally, returns true if and only if this collection contains at least one element e such that (o==null ?
- iterator. Iterator iterator() Returns an iterator over the elements in this collection. There are no guarantees concerning the order in which the elements are returned (unless this collection is an instance of some class that provides a guarantee).
- List Interface. It is a child interface of the collection interface. This interface is dedicated to the data of the list type in which we can store all the ordered collections of the objects.
- Set Interface. It is an unordered collection of objects in which duplicate values cannot be stored. This set interface is implemented by various classes like HashSet, TreeSet, LinkedHashSet, etc.
- SortedSet Interface. It is present in java.util package extends the Set interface present in the collection framework. It is an interface that implements the mathematical set.
- Map Interface. Map is a data structure that supports the key-value pair mapping for the data. It is mainly used in the scenarios where Students are needed to be searched or removed or added according to the roll numbers or in item-frequency scenarios where items are stored along with their frequencies.
Learn how to use the Java Collections Framework to group, store, retrieve, manipulate, and communicate aggregate data. The tutorial covers interfaces, implementations, and algorithms for various collection types and operations.
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Nov 29, 2021 · Since Java is an Object-Oriented Language it mimics the real world. In Java, a Collection is a group of multiple objects put together into a single unit. Java Collections is a very vast topic and as a beginner can be difficult to navigate your way while learning it. Here we have everything you need to know while starting off with Java Collections.
