Top 22 Collection Interview Questions and Answers in Java

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The collections framework was designed to meet several goals, such as − • The framework had to be high-performance. The implementations for the fundamental collections (dynamic arrays, linked lists, trees, and hashtables) were to be highly efficient. • The framework had to allow different types of collections to work in a similar manner and with a high degree of interoperability. • The framework had to extend and/or adapt a collection easily. • Towards this end, the entire collections framework is designed around a set of standard interfaces. Several standard implementations such as LinkedList, HashSet, and TreeSet, of these interfaces are provided that you may use as-is and you may also implement your own collection, if you choose. • A collections framework is a unified architecture for representing and manipulating collections. All collections frameworks contain the following − • Interfaces − These are abstract data types that represent collections. Interfaces allow collections to be manipulated independently of the details of their representation. In object-oriented languages, interfaces generally form a hierarchy. • Implementations, i.e., Classes − These are the concrete implementations of the collection interfaces. In essence, they are reusable data structures. • Algorithms − These are the methods that perform useful computations, such as searching and sorting, on objects that implement collection interfaces. The algorithms are said to be polymorphic: that is, the same method can be used on many different implementations of the appropriate collection interface. • In addition to collections, the framework defines several map interfaces and classes. Maps store key/value pairs. Although maps are not collections in the proper use of the term, but they are fully integrated with collections. • The Collection Interfaces • The collections framework defines several interfaces. This section provides an overview of each interface − • Sr.No.Interface Description1The Collection Interface • This enables you to work with groups of objects; it is at the top of the collections hierarchy. • 2The List Interface • This extends Collection and an instance of List stores an ordered collection of elements. • 3The Set • This extends Collection to handle sets, which must contain unique elements. • 4The SortedSet • This extends Set to handle sorted sets. • 5The Map • This maps unique keys to values. • 6The Map.Entry • This describes an element (a key/value pair) in a map. This is an inner class of Map. • 7The SortedMap • This extends Map so that the keys are maintained in an ascending order. • 8The Enumeration • This is legacy interface defines the methods by which you can enumerate (obtain one at a time) the elements in a collection of objects. This legacy interface has been superceded by Iterator. • The Collection Classes • Java provides a set of standard collection classes that implement Collection interfaces. Some of the classes provide full implementations that can be used as-is and others are abstract class, providing skeletal implementations that are used as starting points for creating concrete collections. • The standard collection classes are summarized in the following table − • Sr.No.Class Description1 • AbstractCollection • Implements most of the Collection interface. • 2 • AbstractList • Extends AbstractCollection and implements most of the List interface. • 3 • AbstractSequentialList • Extends AbstractList for use by a collection that uses sequential rather than random access of its elements. • 4LinkedList • Implements a linked list by extending AbstractSequentialList. • 5ArrayList • Implements a dynamic array by extending AbstractList. • 6 • AbstractSet • Extends AbstractCollection and implements most of the Set interface. • 7HashSet • Extends AbstractSet for use with a hash table. • 8LinkedHashSet • Extends HashSet to allow insertion-order iterations. • 9TreeSet • Implements a set stored in a tree. Extends AbstractSet. • 10 • AbstractMap • Implements most of the Map interface. • 11HashMap • Extends AbstractMap to use a hash table. • 12TreeMap • Extends AbstractMap to use a tree. • 13WeakHashMap • Extends AbstractMap to use a hash table with weak keys. • 14LinkedHashMap • Extends HashMap to allow insertion-order iterations. • 15IdentityHashMap • Extends AbstractMap and uses reference equality when comparing documents. • The AbstractCollection, AbstractSet, AbstractList, AbstractSequentialList and AbstractMap classes provide skeletal implementations of the core collection interfaces, to minimize the effort required to implement them. • The following legacy classes defined by java.util have been discussed in the previous chapter − • Sr.No.Class Description1Vector • This implements a dynamic array. It is similar to ArrayList, but with some differences. • 2Stack • Stack is a subclass of Vector that implements a standard last-in, first-out stack. • 3Dictionary • Dictionary is an abstract class that represents a key/value storage repository and operates 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