Answer:
- How many CheckingAccount objects are there? Two
- How many object reference variables are there? Three
- What will the program print out?
123 Bob 100 456 Jill 900 123 Bob 100
Review of ==
The == (equal-equal) operator is an alias detector.
It checks if two reference variables refer to the same object.
It does not actually look at the objects.
The following program segment illustrates this:
{
CheckingAccount account1 = new CheckingAccount( "123", "Bob", 100 );
CheckingAccount account2 = new CheckingAccount( "456", "Jill", 900 );
CheckingAccount account3;
account3 = account1;
if ( account1 == account 3 )
System.out.println("An alias has been detected!");
else
System.out.println("These are different objects!");
}
It will print out An alias has been detected!.
QUESTION 22:
Say that the following lines are added to the program (immediately following the lines already there):
account3.processCheck( 85 ); // subtract 100 cents, including service charge
account1.display();
account3.display();
What will be printed?