About Variables In Java Programming

In this tutorials we will discussed more about variables in java programming of Class Or Static, Instance, Local and Parameters Or Arguments. 

Types of variables:

Class Or Static 
Instance 
Local
Parameters Or Arguments 



What we need before start the code, I'm using as mention below and already installed in my system:
1. JDK1.6 or +
2. Eclipse
3. Windows OS
4. Basic knowledge of java

Let's start:

Verify the JDK installation

Open the command prompt and verify the java installation
Type the 
C:\>javac -version
javac 1.7.0_25

C:\>java -version
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b17)
Java HotSpot(TM) Client VM (build 23.25-b01, mixed mode, sharing)

Now java installation got verified, as installed JDK1.7.0_25

Verify the Eclipse installation

Go the the installation directory of eclipse and click on the eclipse.exe

e.g C:\eclipse\eclipse-java-mars-1-win32\eclipse\eclipse.exe

Create the new java project in Eclipse:

Open the eclipse
File
New
Java project
Type the project name: Variables_In_Java_Programming
Next
Finish

Create the VariablesInJavaProgramming.java file

Right click on the src created under project Variables_In_Java_Programming
New
Class
Type the name of class: VariablesInJavaProgramming 
Type the package name: com.variables.atozexamples
Finish

package com.variables.atozexamples;

public class VariablesInJavaProgramming {

       // Declared and instantiated with 100 value

       // This is also called as filed.

       private int iInstanceVariables = 100;

       // Class or Static variable

       public static int iClassOrStaticVarible = 1;

       // Class or Static variable as final, we can't change the value and name

       // must be in capital

       public static final int I_CLASS_OR_STATIC_FINAL_VARIBLE = 200;

       // Default Constructor

       public VariablesInJavaProgramming() {

       }

       // Constructor

       public VariablesInJavaProgramming(int iParameterOrArgument) {

              // Overriding the value of iInstanceVariables by iParameterOrArgument

              // value.

              this.iInstanceVariables = iParameterOrArgument;

       }

       private void print(Object oParameter) {

              Object oLocalVaribles = oParameter;

              System.out.println(oLocalVaribles);

       }

       public static void main(String[] args) {

              VariablesInJavaProgramming objVariablesInJavaProgramming = 

                         new VariablesInJavaProgramming();

              objVariablesInJavaProgramming

                           .print("Hello iInstanceVariables you have value =" +                                       objVariablesInJavaProgramming.iInstanceVariables);

              objVariablesInJavaProgramming.iInstanceVariables = 300;

              objVariablesInJavaProgramming

                           .print("Hello iInstanceVariables you have value =" +                                      objVariablesInJavaProgramming.iInstanceVariables);

              objVariablesInJavaProgramming.print("Hello iClassOrStaticVarible " +

                "you have value =" + iClassOrStaticVarible);

              objVariablesInJavaProgramming.iClassOrStaticVarible = 2004;

              objVariablesInJavaProgramming.print("Hello iClassOrStaticVarible "+

                   "you have value =" + iClassOrStaticVarible);

              VariablesInJavaProgramming objVariablesInJavaProgrammingOne = 

                       new VariablesInJavaProgramming();

              objVariablesInJavaProgrammingOne.print("Hello iClassOrStaticVarible "+

                     " you have value =" + iClassOrStaticVarible);

              objVariablesInJavaProgramming

                           .print("Hello I_CLASS_OR_STATIC_FINAL_VARIBLE you have "+

                         "value =" + I_CLASS_OR_STATIC_FINAL_VARIBLE);

              VariablesInJavaProgramming objVariablesInJavaProgrammingTwo = 

                    new VariablesInJavaProgramming(500);

              objVariablesInJavaProgrammingTwo.print(

                    "Hello iInstanceVariables you have value =" +                                      objVariablesInJavaProgrammingTwo.iInstanceVariables);

              objVariablesInJavaProgramming = null;

              objVariablesInJavaProgrammingOne = null;

              objVariablesInJavaProgrammingTwo = null;

              objVariablesInJavaProgrammingTwo.print(

                     "Hello iInstanceVariables you have value =" +                                           objVariablesInJavaProgrammingTwo.iInstanceVariables);

       }

}

All about all java variables in sing place.