What's the difference between boxing and unboxing?

Question

What's the difference between boxing and unboxing, I'm a bit confused?
Is autoboxing the same as boxing?
This is what I know so far:
-This is boxing, i think:
int  []arrayset = {1,2,3};but I don't understand what unboxing is, can someone explain it to me.

Answer 1

I did little research, but please correct me ifI'm
wrong:
Is this similiar to unboxing:
System.out.println(intArray[0] + intArray[1] +
intArray[2]);
Only if intArray is declared asInteger[]
intArray ...Then the Integers at intArray[0] etc are unboxedinto
int primitives before adding.Did you try that before you posted it? Autoboxing is
applied only to an individual primitive/wrapper.
Arrays and collections aren't subject to
autoboxing/unboxing. Basically, the compiler will
fill in constructs such as Integer.valueOf() for you,
it doesn't go as far as generating loops and new
arrays for you
OP, as Peter said, the difference between boxing and
unboxing is merely one of direction. Autoboxing wraps
a primitive up for you, auto-unboxing extracts the
primitive from a wrapperAm fully aware of that, the OP's example contained references to array elements but it was not clear whether that array was declared as Integer[] or int[], hence my answer.
And just for the recordInteger[] intArray = new Integer[] {1, 2, 3}; // autoboxing
System.out.println(intArray[1] + intArray[2]); // autounboxing
// while ...
int[] intArray = new int[] {1, 2, 3}; // no boxing
System.out.println(intArray[1] + intArray[2]); // no unboxingis what i meant.