How will it be to code in JAVA? – Part-1

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code in JAVA

Hello everybody… Today we are going to start a new journey with java programming.  I think you know about this programming little.  If you are a fresher in java then please comment here for the beginning parts.

When we consider a Java program, it can be defined as a collection of objects that communicate via invoking each others methods. Let us now briefly look into what do class, object, methods and instance variables mean.

  • 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 describes 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 logic are written, data is manipulated and all the actions are executed.
  • Instance Variables – Each object has its unique set of instance variables. An object’s state is created by the values assigned to these instance variables.

First Java Program:

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

public class My_First_Java_Program {

/* 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

}

}

Let’s look at how to save the file, compile and run the program. Please follow the steps given below:

  • Open notepad and add the code as above.
  • Save the file as: MyFirstJavaProgram.java.
  • Open a command prompt window and go o the directory where you saved the class. Assume it’s C:\.
  • Type ‘ javac MyFirstJavaProgram.java ‘ and press enter to compile your code. If there are no errors in your code, the command prompt will take you to the next line(Assumption : The path variable is set)
  • If you are using eclipse then you will get the run-time environment there and get the built in compiler there  just save that file in the project and run this by pressing ctrl+F11

Thatz all for today now try it.

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Rajumeazi

I am a free learner like to fly in the whole cyber world to gather knowledge. And I know I have only a little to share but I will try my best to give you what I have. :) Thank you :)

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