Reading and drawing object diagrams is one skill you will be developing this wee

Question

Reading and drawing object diagrams is one skill you will be developing this week. This exercise is designed to help you understand how they work. This is designed as a collaborative exercise.

Examine the object diagram shown at right. If this diagram represents the state of memory before the following statements are executed, what are the values of x and y after the statements are executed? How is the object diagram changed by these statements?

fred.deposit( 150 );
double x = barney.getBalance();
double y = fred.getBalance();

fred barney String BankAccount Flintstone Owner String acctID "12345M" balance 625 String BankAccount owner a Rubble acctID String balance 1000 08964G

Explanation / Answer

Two objects fred and barney are linked with the two Bank accounts flintstone and Rubble.
fred.deposit( 150 );
//when we run this statement it adds the money to the flintstone bank account
so from the object diagram, we can see balance = 625
now new balance = 625+150
               = 775
              
double x = barney.getBalance(); It returns the balance of rubble account so x = 1000

double y = fred.getBalance(); It returns the updated balance of flintstone so y =775

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