Others Java Subjects

• Constructors and the "new" operator

new create a new object from a class. It allocates memory and call the adequate constructor method of the class to initialise field values.

• Class variables and method distinctions
  (this, super, abstract, final, static, instance, and class variables)

Let the students talk ...
This : the object instance of a class (constructors)
super : the parent class

final : method can't be overwritten, class can not be subclassed
static : a class thing. No object instance is needed.

• Packages (package and import)

This week exercise

• Class protection (public, private, protected)

public : accessible anywhere
private : member accessible only within the class that defines it
protected : member accessible only within package and within subclasses.

• Exception handling

A way to deal with things that should not happen (better than the if then else)
Each time there is an input from outside of the program

• Interfaces and abstract classes

abstract : a method implementation is missing somewhere

We now know enough to write a simple example.

eScience