Implementing Classes - Java Concepts - page 169

13. To test a class, use an environment for interactive testing, or write a tester class
to execute test instructions.

14. Instance fields belong to an object. Parameter variables and local variables
belong to a methodȌthey die when the method exits.

15. Instance fields are initialized to a default value, but you must initialize local
variables.

16. The implicit parameter of a method is the object on which the method is
invoked. The this reference denotes the implicit parameter.

17. Use of an instance field name in a method denotes the instance field of the
implicit parameter.

18. It is a good idea to make a class for any part of a drawing that that can occur
more than once.

19. To figure out how to draw a complex shape, make a sketch on graph paper.

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FURTHER READING

1. http://verifiedvoting.org A site with information on voter-verifiable voting
machines, founded by Stanford computer science professor David Dill.

REVIEW EXERCISES

΢ Exercise R3.1 Why is the BankAccount(double
initialBalance) constructor not strictly necessary?

΢ Exercise R3.2 Explain the difference between

BankAccount b;

and

BankAccount b = new BankAccount(5000);

΢ Exercise R3.3 Explain the difference between

new BankAccount(5000);