Understanding Static Keyword.

Replies

• 

  SheldonCooper

  The book says,"When a member is declared static,it can be accessed before any objects of its class are created,and without reference to any object."
  It do not say "must".
  
  Then moving towards your problem:
  "If I declare any method as static can have several restriction as...
  1) They can only call other static methods.
  2) They must only access static data.
  3) They cannot refer to this and super in any way."
  It should be taken as 'Directly' i.e.'without creating object'.And if in the same class.
  
  I have rewritten the 'start' class for you.Copy it into your code and then check.It will explain you the rest.By the way nice question.
  
  class start extends operation
  static void methodname1()
  {
  System.out.println("Hi");
  }
  void methodname2()
  {
  System.out.println("Hi2");
  }
  public static void main(String ar[])
  {
  methodname1();
  methodname2();//This is invalid.Change it to comment while compiling
  test v = new test();
  v.go();
  v.dis();
  display();
  operation.display();
  operation.print();//This is invalid.Change it to comment while compiling
  operation ob=new operation();
  ob.print();
  ob.display();
  }
  
  }
• 

  TheV

  Thank you cooper I got you....!!
• 

  SheldonCooper

  TheV

  Thank you cooper I got you....!!

  😁You are welcome.And that was my first post.😁
• 

  TheV

  Carry on with your helping hands....!!