Learn Java Programming - Autoboxing Tutorial

In my Primitive Wrapper Classes Tutorial I discussed the basics of how the wrapper classes work.
Quick refresher ...
int i = 41;
Integer ref = new Integer(i); // box the primitive int type value into an Integer object

Based on the code sample from above, it would become quite tedious manually exchanging values from primitive types to objects and vice-versa. Say hello to the concept of autoboxing and auto-unboxing! Java autoboxing automatically encapsulates primitive data types into object state for us, Java also does the dirty work by auto-unboxing object state into a primitive value. Autoboxing opens a whole new world of possibilities, especially in future concepts that utilize anything related to Generics. Don't worry about Generics yet, I will discuss them when the time is right.
Here is the same thing as above with autoboxing ...
Integer ref = 41; // autobox the primitive int type value into an Integer object
int i = ref; // auto-unbox a primitive int value from an Integer object

[jvsnyc]

Cool. Using the new Integer() etc. constructors is now deprecated as of Java 9, the ones like Integer.valueOf( someInt ) are preferred...