// wrapper class = provides a way to use primitive data types as reference data types. reference data types contain useful methods can be used with collections (ex.ArrayList)

//primitive     //wrapper
//---------     //-------
// boolean      Boolean
// char         Character
// int          Integer
// double       Double

// autoboxing = the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes
// unboxing = the reverse of autoboxing. Automatic conversion of wrapper class to primitive