09/01/2025
--------------
Q)Write a Java program that stores 2 accounts' data(accno,name,balance) 
into computer memory and displays their details.
//AccountApplication.java
class Account{
      int accno;
      String name;
      float balance;//instance variables
      void storeAccountData(){
          accno=100001;
	  name="Rama";
	  balance=770000;
      }//instance method
      void displayAccountData(){
          System.out.println("ACCNO:"+accno);
          System.out.println("NAME:"+name);
          System.out.println("BALANCE:"+balance);
      }
}//Account data type created
class AccountApplication{
   public static void main(String args[]){
        Account acc1=new Account();//Account class is instantiated
	    acc1.storeAccountData();
        /*
            main method is calling storeAccountData() method on the first
           account object using the reference acc1.
        */
		System.out.println("First account details..........");
	    acc1.displayAccountData();
	/*
            main method is calling displayAccountData() method on the first
           account object using the reference acc1.
        */
	    Account  acc2=new Account();
		acc2.storeAccountData();
         /*
            main method is calling storeAccountData() method on the second
           account object using the reference acc2.
        */
		System.out.println("Second account details..........");
        acc2.displayAccountData();
		/*
            main method is calling displayAccountData() method on the second
           account object using the reference acc2.
        */

   }
}
Q)What happens in the background when the following statement is executed?
          Account acc1=new Account();

=>JVM does the following things in order.
1) It loads Account class(class file) into RAM.
2)It creates the object
3)JVM gives default values to the instance variables of the object.
                Primitive types
		----------------
		int       0
		long     0
		byte     0
		short    0
		float        0.0
		double   0.0
		boolean   false
		char        null character  \u0000
            For rereference variables
	    ---------------------------
	       null
4)JVM calls a specialized method called constructor on the object
5)IT binds the object to the reference variable.