ch 4

This chapter mostly talked about parameters and arguments, to return values, to encapsulation, to instance and local variables. Using the vocabulary "call" and "pass" refers to using a method within a particular reference object, and inputing a value where applicable.

Arguments are passed into methods, and are also parameters  which is a local variable. If a method takes a parameter, it must have something passed to it. Instance variables will always get a default value; if a value is not assigned, it will default to one of four values, depending on the type. Local variables are declared within a method, and must be initialized before use, or else it will not compile.Instance variables are declared within a class,

Initializing an instance variable is done through giving the variable an intial value, and that a referenced instance variable will return the default values of null if it is a string or 0 if it is an integer variable.