1. Structural Patterns Class patterns – inheritance
Object patterns – composition
- you can change the composed class at run-time

2. class UsefulClass
useful_operation()
Class NicksClass
UsefulClass myUsefulClass;
nicks_operation() {
myUsefulClass.useful_operation() }

4. OtherClass
Request()

5. Bridge
Abstraction – the set of operations a class or class hierarchy must support
Implementation – Different ways of performing those operations

6. DataImp UpdateData SQLupdate PickleUpdate changeGrade(name…)
Send SQL update cmn
To database
changeGrade(name…) {
Read in data, change it,
Write to file

7. ? ? DataImp UpdateData SQLupdate PickleUpdate changeGrade(name…)
Send SQL update cmn
To database
changeGrade(name…) {
Read in data, change it,
Write to file