static and non static introduction

"static members" are accessed only "static and non static methods".

ex :  static int b=200; (static member)

"non static members" are accessed by "non static methods".

ex :   int a=100; (non static member)

if we want to access any data members directly in a main() then we use "static members".

ex :

public static void main(String args[])
 {
  System.out.println("static variable b :"+b);  // execute
  System.out.println("\nnon static variable a :"+a);  // error
}