Java Programming in 60 Seconds: Primitive data types and Java class wrappers

Java Programming in 60 seconds. Primitive data types and class wrappers. What is the difference between an int and an Integer, a double with a lowercase 'd' and a Double with an uppercase 'D'? The answer is that ints and doubles are primitive data types whereas Integers and Doubles are Java classes from which objects can be created. Primitives have no methods; Java classes and objects do.

Here I explain primitive data types and Java's Object Oriented 'class wrappers'.