JAVA BLOG_3

                          VARIABLES

          Variable is name of reserved area allocated in memory which memory is called as RAM . 

        Ex:: int data=1;//data is variable.

 

• Types of Variables

  1)local variable

  2)Instance variable

  3)static variable

   

  Local Variable -:

                 A variable that is declared inside the method called local variable.

   

  Instance Variable -:

                     A variable that is declared inside the class but outside the method is called instance variable.It is not declared as static.

   

  Static Variable -:

                       A variable that is declared as static is called static variables.It cannot be local

   

   -------------------------------------------------------

  Program:

           class VariableDemo
           {
                  int a=1;
                  /*
                 (int a) is a not-static data member so it
                 gives Exception while excecuting the
                 Program.
  
               so main method is a static method so 
               only static data members can be 
               initialized in main method.
  
               if we want to execute instance non 
               static data member then you have to 
               create object for that not static member
               then it will excecute successfully  
                */
  
               static int b=2;
  
               public static void main(String args[])
              {
             VariableDemo n = new VariableDemo();
                   int c=3;
                   System.out.println("a:"+n.a);
                   System.out.println("b:"+b);
                   System.out.println("c:"+c);
               }
  

       }