LECTURE NOTES - 4/13/2005

LAST TIME

3
- subclass construction
- converting between subclass and superclass types
- polymorphism
- Object class

6
- call on the implicit parameter can still vary
- Object class
- overriding the toString method
  - Class class
  - Object::getClass() method

TODAY

3
- overriding the toString method

all
- protected
- exception handling
- throwing exceptions
- checked and unchecked exceptions

PROTECTED

- would like subclass method to be able to directly access private superclass field
- can declare an instance field protected instead of private
- syntax:
  protected <type> <field name>;
- e.g. LifeForm
  protected int energy;
- can be accessed by methods of
  - class
  - subclasses
  - all classes in same package