1. The O-O Toolbox Joseph Sant Sheridan College.

2. Why a Toolbox? Developing large software systems so that they function according to specification is difficult. Tools might help us reuse code. Tools might help us make our programs more robust. Tools might help us better co-ordinate code from different programmers.

3. What’s in the Toolbox. Picture from benbbrave.blogspot.com

4. What do we need. A way of protecting our code from accidental alteration by other parts of the program is more difficult. A way where we can automatically include the data and behaviour of another class in the definition of our class without having to recode it. A way of checking that code created to be used with our code matches the requirements that we demanded to work with our code.

5. What do we need. A way to notify other parts of the program that something prevented our code from properly completing its task. A way to include objects of another type in our own classes to save work. Away to process different types of objects using the same code.