Primitive vs. object data types


Primitive data types Object data types
int, double, boolean, etc. String, Scanner, etc.
type name starts with a lower case letter type name starts with an upper case letter
consist of a single value can be composed of several values
(a String is composed of several charactes)
cannot be null
(always have a valid value)		 can be null
cannot have methods can have methods
(f. e. method equalsIgnoreCase() in String)
we cannot define own primitive data types we can define own object data types