20/01/25
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Q)What is the limitation of the previous application(AccountApplication.java)?
    =>Both the accounts have same state(data).
    =>Every object of a class will have same structure(properties) and behaviour.But
    for practical reasons, they should not have the same state.
Q)How to ovecome the limitation of the above program?
    =>by making storeAccountData() method as parameterised method, this 
    limitation can be overcome.
    void storeAccountData(int ano,String nm,float bal){
                 
              accno=ano;
	      name=nm;
	      balance=bal;
      }//instance method
Note:- Every method has 2 parts.
             1)method header
	     2)method body
=>Task performing code written between the flower braces is nothing but
the body of the method.
=>Variables created in the method header are known as parameters.
     For eg. 
             ano,nm, bal  are parameters.
=>Parameters are the means with which calling methods supply input data 
to the called methods.
=>Method calling time supplied values are known as arguments.
Q)Modify AccountApplication.java so as the two account objects have different state.
class Account{
      int accno;
      String name;
      float balance;//instance variables
      void storeAccountData(int ano,String nm,float bal){
          accno=ano;
	      name=nm;
	      balance=bal;
      }//parameterised instance method
      void displayAccountData(){
          System.out.println("ACCNO:"+accno);
          System.out.println("NAME:"+name);
          System.out.println("BALANCE:"+balance);
      }//non parameterised instance method
}//Account data type created
class AccountApplication{
   public static void main(String args[]){
            Account acc1=new Account();
	    acc1.storeAccountData(10001,"Rama",50000);
           System.out.println("First account details..........");
	    acc1.displayAccountData();
	    Account  acc2=new Account();
	   acc2.storeAccountData(10002,"David",50000);
           System.out.println("Second account details..........");
           acc2.displayAccountData();
	}
}
Q)What is a constructor?
   =>A specialised method of a class whose name and the class name same and that
   doesn't have any return type not even void is known as a constructor.
Q)What is the purpose of a constructor?
     =>Constructor is used to initialze an object.I.e. a constructor is used to give
     initial state to the object.

Q)How are constructors classified?
      1)zero argument/non parametersied/no argument/default constructor
      2)parameterised constructor