BioInformatics Pakistan

Lecture 1 Page 2

Ansari — Fri, 02 Sep 2011 18:07:40 GMT

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Now Some Basic Examples

1. Basic Data Types:

Every variable has some data type in JAVA, this data type decides what this variable will store. Some basic data types are as follows:

String: As name describes it is used to store strings(Sequence of alphabets) in it. It is used as String s = "Its JAVA course";
int: as name shows it stores integer value. It can't store decimal value e.g int a = 20;
float and double: These two data types are used to store decimal values, difference in them is the usage of memory. More you will learn with time. It can be used as float x = 2.99;

2. Simple Program That Uses Strings:

Make new project named StringTest as described before.
Write following commands in main method.

String x = "Java ";
String y = "Course";
String z = x+y;
System.out.println(z);

Test this and try different such statements.

3. Simple Calculations:

Make new project named BasicMaths as described before.
Write following commands in main method.

int a =12;
int b =3;
int c,d,e,f,g;
c= a+b;
d= a*b;
e= a-b;
f= a/b;
g= a%b;
System.out.println("Addition : "+ a +" + "+ b +" = "+ c );
System.out.println("Multiplicaton : "+ a +" * "+ b +" = "+ d );
System.out.println("Subtraction : "+ a +" - "+ b +" = "+ e );
System.out.println("Division : "+ a +" / "+ b +" = "+ f );
System.out.println("Remainder : "+ a +" % "+ b +" = "+ g );

Test this and try different such statements.

For Discussion I Will Be Online After 9 PM

(Pakistan) Daily.

You Can Also Leave A Thread At FORUM Which Will Be Answered In 24 Hrs.

Your Assignment After This Lecture Is To Practice All These Tasks And Give Some New Examples At FORUM.

Next Lecture Will Be On Tuesday.

Lecture 1

Ansari — Fri, 02 Sep 2011 08:06:15 GMT

Lecture 1

Java Programming Basics

1. General Overview

Hello all members I welcome you all to first class. As I expect all of you as beginners to programming, so, I will try to start from grass root level. I assure you all be consistent during this course and after this course you will be good programmers.

I hope that all of you have installed JAVA and Netbeans IDE. Today, I am starting with basics of java programming language.

Hey, friends don't be afraid of theory in this class because me too hate it very much. But too some extent some keywords are important to be described that's why today I am explaining them.

2. Making Your First Project

Lets make first java project using Netbeans IDE. Follow these simple steps:
Open Netbeans IDE.
Click on File.
Select New Project.
Set Project Category as JAVA and choose project as JAVA Application.
Set project name as HelloWorld and leave other options as it is.
Click Finish.
You have made your first project. Now you can code in it.

3. Looking At the Infamous Hello, World! Program

Replace // TODO code application logic here With System.out.println("Hello,World");
Now press F6 or Play button in second menu bar.
Result: Hello, World will be visible at the bottom.
Image below showing all three steps.

Later in this chapter, you discover in detail all the elements that make up this program. But first, I want to walk you through it word by word.

public: A keyword of the Java language that indicates that the element that follows should be made available to other Java elements. In this case, what follows is a class named HelloApp. As a result, this keyword indicates that the HelloApp class is a public class, which means other classes can use it.
class: Another Java keyword that indicates that the element being defined here is a class. All Java programs are made up of one or more classes. A class definition contains code that defines the behavior of the objects created and used by the program. Although most realworld programs consist of more than one class.
HelloApp: An identifier that provides the name for the class being defined here. While keywords, such as public and class, are words that are defined by the Java programming language, identifiers are words that you create to provide names for various elements you use in your program. In this case, the identifier HelloApp provides a name for the public class being defined here. (Although identifier is the technically correct term, sometimes identifiers are called symbols or names.)
{: The opening brace marks the beginning of the body of the class. The end of the body is marked by the closing brace. Everything that appears within these braces belongs to the class.
public: The public keyword is used again, this time to indicate that a method being declared here should have public access. That means classes other than the HelloApp class can use it. All Java programs must have at least one class that declares a public method named main. The main method contains the statements that are executed when you run the program.
static: For now, just take my word that the Java language requires that you specify static when you declare the main method.
void: In Java, a method is a unit of code that can calculate and return a value. For example, you could create a method that calculates a sales total. Then, the sales total would be the return value of the method. If a method doesn’t need to return a value, you must use the void keyword to indicate that no value is returned. Because Java requires that the main method not return a value, you must specify void when you declare the main method.
main: Finally, the identifier that provides the name for this method.As I’ve already mentioned, Java requires that this method be named main. Besides the main method, you can also create additional methods with whatever names you want to use. (String[] args): Oh boy. This Java element is too advanced to thoroughly explain just yet. It’s called a parameter list, and it’s used to pass data to a method. Java requires that the main method must receive a single parameter that’s an array of String objects. By convention, this parameter is named args. If you don’t know what a parameter, a String, or an array is, don’t worry about it now :).
Another {: Another set of braces. These mark the body of the main method. In short, whenever you come to a closing brace, it is paired with the most recent opening brace that hasn’t already been closed — that is, that hasn’t already been paired with a closing brace.
System.out.println("Hello, World!”);: This is the only statement in the entire program. It calls a method named println that belongs to the System.out object. The println method displays a line of text on the console. The text to be displayed is passed to the println method as a parameter in parentheses following the word println. In this case, the text is the string literal Hello, world! enclosed in a set of quotation marks. As a result, this statement displays the text Hello, World! on the console. Note that in Java, statements end with a semicolon. Because this is the only statement in the program, this line is the only one that requires a semicolon.
}: The closing brace that marks the end of the main method body.
Another }:The closing brace that marks the end of the HelloApp class body. Because this program consists of just one class, this line also marks the end of the program.

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Making Applications In JAVA

Ansari — Sun, 28 Aug 2011 18:35:29 GMT

Making Application In JAVA

1. Description:

You can make applications that are able to run on different social networks like facebook using JAVA. A simple game app is shown in figure. Application can help you a lot in promoting your business. We will teach you how to make apps in the upcoming FREE ONLINE JAVA COURSE. So please join us and learn how to make apps in JAVA.

Join Free Course Now

Check Out This App.

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Why JAVA ?

Ansari — Thu, 25 Aug 2011 18:47:19 GMT

Why Should I Use JAVA ?

In this introductory lecture we will try to explain that why one should use JAVA, despite of the fact that other languages are also present like c# and .net etc.

Lets see some important features of JAVA that make the developers to use JAVA as programming language.

1. What is Java technology ?

Java is a programming language and computing platform first released by Sun Microsystems in 1995. It is the underlying technology that powers state-of-the-art programs including utilities, games, and business applications. Java runs on more than 850 million personal computers worldwide, and on billions of devices worldwide, including mobile and TV devices.

2. JAVA Is Freeware:

The thing that every programmer and user love the most that JAVA is a freeware. It is easily available to users of your application with out any cost. The other important thing is that majority of JAVA IDE's and compilers are also freewares and are available on internet.

3. JAVA Is Platform Independent:

As a JAVA developer you don't have to worry about your client machine. The worst thing about other languages is that you have to code differently for different environments e.g: the code running on xp will not work linux or MAC OS but on the other hand JAVA is platform independent and one JAVA code is able to run on all environments (Even on mobiles in some scenarios).

4. JAVA Is Easy:

The important thing about learners is that Java is easy among all languages. Java also support web apps and web programming in more efficient way.

About The Course:

Course Contents:

The provisional course outline is given below. All the topic are with practice problems.

Introduction to Java Applications
Introduction to Classes and Objects
Control Statements
Methods
Arrays
Classes and Objects: A Deeper Look
Object-Oriented Programming: Inheritance
Object-Oriented Programming: Polymorphism
GUI Components
Exception Handling
Files and Streams
Recursion
Introduction to Java Applets
Multithreading
Accessing Databases with JDBC
Servlets

Note: In the upcoming course our focus will be on practical side of Java and we will not explain all the theoretical concepts in detail. But still on student request we can explain them that's why you should be active if you want to learn more.

Join Free Course Now

Introductory Lecture

Ansari — Wed, 24 Aug 2011 20:12:42 GMT

Introductory Lecture

"Knowing is not enough; we must apply. Willing is not enough; we must do."

(Johann Wolfgang von Goethe)

The biggest advantage of using JAVA is that JAVA is freeware and all other tools that we will use in this course will also be freewares.

1. System Requirements:

1.8 GHz Or More Processor
512 or More RAM

2. Making Your System Ready For JAVA Programming:

Download and install latest version of JAVA. You can download it here.
Download and install NetBeans IDE. You can download it here. (Download All of size 245 MB)

3. Unblock JAVA:

If your computer requires to unblock JAVA than let him do this.

4. Support:

If you feel any problem while downloading or installing and making your computer ready for JAVA feel free to contact us on our FORUM or leave a comment on this post.

Get In Touch With Us... For Updates And Guidance

Welcome Users

Ansari — Tue, 23 Aug 2011 18:48:22 GMT

We Welcome Users To Free Online JAVA Course

"JAVA For Beginners"

We are happy to announce that we are launching our first free online course from 3rd September, 2011. This course is for all those people who want to learn computer languages specially JAVA. This course doesn't require any previous knowledge of programming.

1. What we will cover ?

Basic JAVA concepts
Application Development in JAVA
Website Development
Applet Development
Database Development
Database Softwares

2. What will be our strategy ?

Our aim is to teach JAVA and make every registered user capable of developing applications, for this purpose we will upload a lecture/tutorial after every 3 days than we will open chat room and forum for solving problems of users. We will be like an online community which will move by helping each other. All the users are intended to help other users on the site.

3. What is the time period ?

We will try to cover this course with in 6 months but it depends totally on intended audience. We will never be too fast that some users may not cope with us.

4. Quizzes, Assignments And Projects:

We will provide you with online quizzes and will give you small projects as assignments.Which will help you in grasping the programming trick and tactics.

5. What will you get from this course ?

After this course you will be able to develop your own JAVA applications, we will assist you as much as we can in doing so. You will be able to make your own dynamic website with java apps on it.

6. How will we support you ?

We have developed a separate forum for this course in FORUMS and integrated chat room for special support.

For Registration Register On This Site

Introductory Lectures