Month: January 2019

Serialization

A Java Class Object needs to serialized if we need to store or transfer with the state values. For any IO operations or network operations usually the java class objects needs to sent/received via network via bytes. During serialization, Object along with state is serialized to bytes and can be processed between the systems as …

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Encryption-Decryption (AES)

Encryption is process of encoding meaningful information using mathematical algorithms using a standard key, so that only authorised parties can only decode/decrypt it. Authorised parties usually shares the secret keys each other so that encrypted information can only be decrypted by them.     Plain Text + Key -> Encrypted text     Encrypted Text – Key -> Plain …

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Hashtable

Hashtable is an implementation for storing/processing list of objects using a hashkey and buckets. Hashtable has default load capacity of 11, where it will create default 11 buckets if not provided in specific., and stores the list of objects in the buckets based on the object hashkey. Any object/value inserted into Hashtable object, will be …

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java.util.Map

Map is another important key interface in Java present in java.util package. Map contains list of objects associated with a key., for quick retrieval.Each Key is tied to one object i.e., every Object has its own unique key. Since Map stores object values based on keys, it dont maintain any order. Add/Retrieval/Search operations can be …

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java.util.Set

Set is another important Datastructure created in Java, just like List.Set is same as List, except it dont contain duplicates, and dont maintain order. As you remember, List can have duplicates & also maintains internal Order. Set Types: Below are the most used implementation classes of Set Interface. HashSet – HashTable implementation of Set Interface. …

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java.util.List

List is an interface, the most widely used data structure in java, implements the Collections interface. List stores a list of objects, in an inserted order, stores duplicate values. There are different data structure implementations of List interface, like ArrayList class, LinkedList class, Vector class etc., 1. Insert/Delete a Object in a List Methods : …

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Collections

Collection is the core framework developed in Java using design Patterns.This framework provides the data structure architecture to store, retrieve and process the group of objects/elements. Java Collections has so many interfaces like List, Map, Set, Queue, Vector. List – Ordered collection of Objects, (Maintain Insertion Order) Map – Collection of Key Value Pair Objects, …

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