- A class is the blueprint for an object, it determine what the object knows (instance variables) and what the object does (methods).
- Instances in one class all have the same methods but the methods can 'behave' differently based on the values of the instance variables.
- You can send things to methods.
- You can use methods to return things. (must declare a return type to get something back(returned))
- Methods can return "void".
- You can make things public or private.
- Use brackets ([#]) to get a number of things ( a certain number of objects in an array, or the number of times the dog will bark).
- Instance Variables have a defult value, local variables do not(method parameters act as local variables).
Variable Default value
Integers 0
- Instance variables are declared inside a class but not within a method.
- Local variables are declared inside a method.
- Since local variables do not have a default value the must be initialized (given a value or defined) before you can run the program (but they can be placed/declared before being initialized).
- To test if primitives are the same use == .
- To test if objects are the same use .equals () .
Floating Points 0.0
Booleans false
References null
