AES Encryption

 Introduction AES stands for Advanced Encryption Standard. AES is a symmetric key encryption procedure which will swap the generally utilized Data Encryption Standard (DES).  It was the consequence of a worldwide call for submissions of encryption calculations issued by the US Government's National Institute of Standards and Technology (NIST) in 1997 and finished in 2000.  The winning calculation, Rijndael, was produced by two Belgian cryptologists, Vincent Rijmen and Joan Daemen.   AES furnishes solid encryption and has been chosen by NIST as a Federal Information Processing Standard in November 2001 (FIPS-197), and in June…Read more

What is Uninterrupted Power Supply?

This article gives the information of “Uninterrupted Power Supply (UPS)”. UPS is a device connected between the electric power source and computer to ensure that electrical flow is not interrupted. An uninterrupted power supply (UPS) also known as an Uninterrupted Power Source or a battery backup is a device which maintains a continuous supply of electric power to connected equipment by supplying power from a separate source when utility power is not available. An alternative power source, usually a set of batteries, used to power a computer if the normal power services is…Read more

Polymorphism & Virtual Functions in C++

What is polymorphism? Object oriented programming language supports the concept of polymorphism which is characterized by the phrase “one interface multiple methods “. In simple term polymorphism is the attribute that allows one interface to control access. in another words polymorphism means to take more than one form . For example an operation may demonstrate different behaviour according to the exact nature of situation .  For example consider operation draw a shape if there are three operands then it will draw a triangle, if there are two operands then operation will draw line.…Read more

Software Test Management

WHAT IS TEST PLANNING ? Test management is the movement of supervising a few tests. A test management instrument is programming used to administer tests (robotized or manual) that have been long ago specified. It is regularly connected with robotization programming. Test management instruments frequently incorporate necessity or detail management modules that permits immediate era of the prerequisite test grid (RTM), which is one of the primary measurements to demonstrate utilitarian scope of a framework under test (SUT). SOFTWARE TESTING LIFE CYCLE TEST PALING I.            Define test  strategy II.            Estimation of test cases…Read more

File System Management in OS

WHAT IS A COMPUTER FILE? File is defined as collection of related data that is stored on the secondary storage devices . user stores his or her data inform of a file. Computers understand only physical memory areas where a user understands to access files only by its names. Data in file could be image, text, video, audio, etc. On generally cutting edge working frameworks, indexes are ordered into one-dimensional exhibits of bytes. The configuration of a record is characterized by its substance since a document is singularly a holder for information, despite…Read more

GUI Based Applications

How to Create a Menu:- A JMenu is different from other components because you cannot add a JMenu component to ordinary containers and have them laid out by the layout manager. You can add menus only to a container. This section describes the following procedure to create a menu: Create a JMenuBar object, and set it into a menu container, such as a JFrame. Create one or more JMenu objects, and add them to the menu bar object. Create one or more JMenuItem objects, and add them to the menu object. Note 1:…Read more

Principles of OOP

CLASS Class is made of data and functions. OBJECTS Objects are basic run time entity in object oriented system. They represent a place, a bank account,  or person.  Objects are the instance of class or a variable of user defined data types. When you declare a class there is no memory for data, after creation of class memory is allocated for data and this process is called as instantiation. Each object has its own copy of instance variable of its class. It means any changes to the variable of one object have no…Read more

Handling GUI Generated Events 3

Developing Event Listener:- In this section, you will learn about a design and implementation choices for implementing event listeners. Event Adapters:- It is a lot of work to implement all of the methods in each of the listener interfaces, particularly the MouseListener interface and WindowListener interface. For example, the MouseListener interface declares the following methods: public void mouseClicked(MouseEvent event) public void mouseEntered(MouseEvent event) public void mouseExited(MouseEvent event) public void mousePressed(MouseEvent event) public void mouseReleased(MouseEvent event) As a convenience, the java programming language provides adapter classes that implement each interface containing more than one…Read more

Handling GUI Generated Events 2

GUI Behavior:- This section describes the event categories. Event Categories:- The general mechanism for receiving events from components has been described in the context of a single type of event. Many of the event classes reside in the java.awt.event package, but other exist in the API. For each category of events, an interface has to be implemented by the class objects that want to receive the events. That interface demands that one or more methods be defined as well. Those methods are called when particular events arise. The given below lists these categories…Read more

Handling GUI Generated Events 1

What is an Event? When the user performs an action at the user interface level (clicks a mouse or presses a key), this causes an event to be issued. Events are objects that describe what has happened. A number of different types of event classes exist to describe different categories of user action. When a user clicks a GUI button, an event object is created by the JVM and the button sends this event to the event handler for that button by calling the actionPerformed method. Event Sources:- An event source is the…Read more