Best Java Training in Chandigarh | Java Training Institute in Chandigarh
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Collections in Java
Java provided ad hoc classes such as Dictionary, Vector, Stack, and Properties to store and manipulate groups of objects. Although these classes were quite useful, they lacked a central, unifying theme. Thus, the way that you used Vector was different from the way that you used Properties.
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 –
- The Collection Interface
- The List Interface
- The Set
- The SortedSet
- The Map
- The Map.Entry
- The SortedMap
This enables you to work with groups of objects; it is at the top of the collections hierarchy.
This extends Collection and an instance of List stores an ordered collection of elements.
This extends Collection to handle sets, which must contain unique elements.
This extends Set to handle sorted sets.
This maps unique keys to values.
This describes an element (a key/value pair) in a map. This is an inner class of Map.
This extends Map so that the keys are maintained in an ascending order.
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Infowiz Software Solutions is one of the leading Java Training Institute in Chandigarh with some of the most innovative teaching methods, state-of-the-art
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- Two-Three big floor building infrastructure with AC classrooms for Java training.
- Large computer machines laboratory with almost 100 computer machines in the lab.
- Servers are provided to the students to practice their topics and concepts of Java training in Chandigarh.
- Industrial projects are provided to the students if they are doing their Java industrial training.
- Our trainers prepare candidates according to interview cracking level with all required practices.
- All candidates go for test and presentation process for 3 times regularly during Java training in Chandigarh. This is a
performance check process for every student.
- Personality development classes, interview session, English speaking session is also available in our Institute.
Contact Infowiz Software Solutions – Java Training in Chandigarh
Address: SCO 118-120, (Near State Bank of India), Sub City Center, Sector 34-A, Chandigarh, Pin Code 160022.
Phone Number: +91 9888-500-888, +91 172-4567-888