Memory of Computer

— RAM-Random Access MemoryROM- Read Only Memory

    Cache Memory (BIOS-Basic Input Output system)

         Input Device :- The electric, electronics   and  physical component of a computer is called Hardware.

   
    —CPU, HDD, Monitor, Keyboard etc.

  


—Processing Device : software represents the set of programs that govern                                                             the operation of a computer system and make the hardware run.

—Output Device:  Application Software i.e. MS-Office, Tally & Fox- Pro. etc

—System Software i.e. Windows Xp, DOS, Win Vista, Windows 2007 etc.

—Operating System

—  Hardware : The electric, electronics              and physical component of a computer is called          Hardware.

—       CPU, HDD, Monitor, Keyboard etc.

—
Software : software represents the set of programs that govern the operation of a computer system and make the hardware run.

—Application Software i.e. MS-Office, Tally & Fox- Pro. etc

—System Software i.e. Windows Xp, DOS, Win Vista, Windows 2007 etc.

Classification of digital Computer

—Micro Computer or PC

—One User work at a time on a computer.

—Come on a simple desk & low in prize.

—Mini Computer

—Up to 10 users work at a time on a computer.

—Used by a Medium Level Company

—It size was Refrigerator size.

—Main Frame Computer

—Up to 100 user work at a time on a computer.

—Used by High Level Company, Banks, Govt. Sector etc.

—It size was complex size.

—Super Computer

—Used by the Scientist for Research & Development.

oRADAR

oSONAR

oSatellite purpose

oForecasting & Broadcasting

Classification of Computer

—Analog Computer: In analog continuous quantities are used. Computations are carried out with physical quantities such as voltage, length, current, temperature etc.

—i.e. Calculators, & Thermometers etc.

—Digital Computer: The digital computers works upon discontinuous data. They convert the data into digit (Binary Digits 0 & 1) and operations are carried out on these digits as extremely fast rates.

—i.e. Desktop, Laptop PC & Mobiles etc.

—Hybrid Computer : It is a both combinations of Analog & Digital Features.

—i.e. PCO Machine or PCO Printer etc.

vNote: The Digital computer can be classified into four main classes.

Abbreviation of COMPUTER is ?

—C  -  Common

—O  -  Operating

—M  -  Memory 

—P  -  Purposely

—U  -  Used for

—T  -  Training

—E  -  Educational

—R  -  Research  

What is Computer ?

—Computer is an electronics devices. Which working at a very fast speed with high accuracy and capable to perform arithmetical and Logical operations of compute data.    Or

—Computer is an electronic device which can perform a variety of operations in accordance to set of instructions provided to it.

—

What is WordPad.

What is Microsoft Paint.

Top Ten Hacker Tools

Hacker tools are programs written to access a computer system using known software vulnerability. Most of these programs have been written and are freely distributed from "Hacker" websites. Some of these programs were written for legitimate uses and are abused as a hacking tool.

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What is red- and white-hat hacking?

I'm not sure what you mean by "red-hat" hacking, unless it refers to some kind of Linux hacking. The "hat" colors in hacking have evolved as hackers try to differentiate themselves and separate the good hacker from the bad.

"White Hat" usually refers to hackers who don't break the law, commit any offense or engage in any malicious activity as part of their hacking. The term is now commonly used by security consultants who offer hacking/penetration testing as part of their services.

"Black Hat" is the term that white-hat hackers and commentators often use to define malicious hackers who cause harm or break laws as part of their hacking exploits. The term "cracker" is also used to describe black-hat hackers. But, most black-hat hackers don't usually care what you call them, just as long as it's not "script kiddies."

"Grey Hat" is the term often given to hackers whose actions are not malicious but whose hacking methods may cross legal or ethical lines. It's also used to categorize hackers who may at one stage have broken the law in their hacking activities, but who have since come across to the more ethical white side.

As the security industry grows and new categories of hackers emerge, perhaps Red Hats will denote aggressive hackers, and Green Hats will only be worn by Irish hackers!

Seeking an ethical hacking career: How to learn ethical hacking

The field of ethical hacking is increasingly popular, and I'd like to know more about what it actually is. Can you tell me what an ethical hacker does, what skills he or she needs, and what it means (generally speaking) throughout the industry to be an "ethical" hacker, as opposed to unethical?

What is “out” in System.out.println()?

We now know that ‘out’ is a variable, so we must now ask ourselves what kind of variable is it? There are two possibilities – it could be a static or an instance variable. Because ‘out’ is being called with the ‘System’ class name itself, and not an instance of a class (an object), then we know that ‘out’ must be a static variable, since only static variables can be called with just the class name itself. So now we know that ‘out’ is a static member variable belonging to the System class.

In Java, how does System.out.println() work?

This question is an excellent example of how just some very basic knowledge of Java can lead you to the correct answer. Most interviewers would not expect you to know the answer to do this right away – but would like to see how you think and arrive at an answer.

Marcus Aurelius (a Roman emperor) once said: "Of each particular thing ask: what is it in itself? What is its nature?". This problem is an excellent example of how that sort of thinking can help one arrive at an answer with only some basic Java knowledge.

With that in mind, let’s break this down, starting with the dot operator. In Java, the dot operator can only be used to call methods and variables so we know that ‘out’ must be either a method or a variable. Now, how do we categorize ‘out’? Well, ‘out’ could not possibly be a method because of the fact that there are no parentheses – the ‘( )’ – after ‘out’, which means that out is clearly not a method that is being invoked. And, ‘out’ does not accept any arguments because only methods accept arguments – you will never see something like “System.out(2,3).println”. This means ‘out’ must be a variable.

Java

Java

Java in Career for Students | Graduates | Professionals & Masters

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Java Lesson -2

First Java Program:

Let us look at a simple code that would print the words Hello World.

public class MyFirstJavaProgram{

   /* This is my first java program. 

    * This will print 'Hello World' as the output

    */

    public static void main(String []args){

       System.out.println("Hello World"); // prints Hello World

    }

}

About Java programs, it is very important to keep in mind the following points.

• Case Sensitivity - Java is case sensitive which means identifier Hello and hello would have different meaning in Java.
• Class Names - For all class names the first letter should be in Upper Case. 
  
  If several words are used to form a name of the class each inner words first letter should be in Upper Case.
  
  Example class MyFirstJavaClass
• Method Names - All method names should start with a Lower Case letter. 
  
  If several words are used to form the name of the method, then each inner word's first letter should be in Upper Case.
  
  Example public void myMethodName()
• Program File Name - Name of the program file should exactly match the class name. 
  
  When saving the file you should save it using the class name (Remember java is case sensitive) and append '.java' to the end of the name. (if the file name and the class name do not match your program will not compile).
  
  Example : Assume 'MyFirstJavaProgram' is the class name. Then the file should be saved as'MyFirstJavaProgram.java'
• public static void main(String args[]) - java program processing starts from the main() method which is a mandatory part of every java program..

Java Identifiers:

All java components require names. Names used for classes, variables and methods are called identifiers.

In java there are several points to remember about identifiers. They are as follows:

• All identifiers should begin with a letter (A to Z or a to z ), currency character ($) or an underscore (_).
• After the first character identifiers can have any combination of characters.
• A key word cannot be used as an identifier.
• Most importantly identifiers are case sensitive.
• Examples of legal identifiers:age, $salary, _value, __1_value
• Examples of illegal identifiers : 123abc, -salary

Java Modifiers:

Like other languages it is possible to modify classes, methods etc by using modifiers. There are two categories of modifiers.

• Access Modifiers : default, public , protected, private
• Non-access Modifiers : final, abstract, strictfp

We will be looking into more details about modifiers in the next section.

Java Variables:

We would see following type of variables in Java:

• Local Variables
• Class Variables (Static Variables)
• Instance Variables (Non static variables)

Java Arrays:

Arrays are objects that store multiple variables of the same type. However an Array itself is an object on the heap. We will look into how to declare, construct and initialize in the upcoming chapters.

Java Enums:

Enums were introduced in java 5.0. Enums restrict a variable to have one of only a few predefined values. The values in this enumerated list are called enums.

With the use of enums it is possible to reduce the number of bugs in your code.

For example if we consider an application for a fresh juice shop it would be possible to restrict the glass size to small, medium and Large. This would make sure that it would not allow anyone to order any size other than the small, medium or large.

Example:

class FreshJuice{

   enum FreshJuiceSize{ SIZE, MEDIUM, LARGE }

   FreshJuiceSize size;

}

public class FreshJuiceTest{

   public static void main(String args[]){

      FreshJuice juice = new FreshJuice();

      juice.size = FreshJuice. FreshJuiceSize.MEDIUM ;

   }

}

Note: enums can be declared as their own or inside a class. Methods, variables, constructors can be defined inside enums as well.

Java Class -1

Java Lesson -1

What is Java?

Java is:

• Object Oriented
• Platform independent:
• Simple
• Secure
• Architectural- neutral
• Portable
• Robust
• Multi-threaded
• Interpreted
• High Performance
• Distributed
• Dynamic

Java Environment Setup:

Java SE is freely available from the link Download Java. So you download a version based on your operating system.

You can refer to installation guide for a complete detail.

Java Basic Syntax:

• Object - Objects have states and behaviors. Example: A dog has states-color, name, breed as well as behaviors -wagging, barking, eating. An object is an instance of a class.
• Class - A class can be defined as a template/ blue print that describe the behaviors/states that object of its type support.
• Methods - A method is basically a behavior. A class can contain many methods. It is in methods where the logics are written, data is manipulated and all the actions are executed.
• Instant Variables - Each object has its unique set of instant variables. An object's state is created by the values assigned to these instant variables.

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C Video Tutorial in Hindi Part -1

इस विडियो में हम आपको लैंग्वेज क्या होता है बता रहे है आशा है ये आपको पसंद आयेगा ! तो मै आपको अब बताता हु की लैंग्वेज क्या होता है -

Language का मतलब भाषा होता है ! और जैसा की आप जानते है की भाषा एक माध्यम है जिसका प्रयोग करके आप अन्य किसी ब्यक्ति के सामने अपने बिचार प्रस्तुत करता है !                  या
भाषा एक ऐसा माध्यम है जो जिसका प्रयोग सुचनओं के आदान-प्रदान करने के लिए किया जाता है !