What is autoboxing in java?

Answer 1

With the advent of Java 2.0 (yay!!!), now when a method expects an Object as its parameter can be passed a primitive data type (i.e. int, double, char) and automatically "box" it into its corresponding Wrapper Object (i.e. Integer, Double, Character), thus primitives could be passed as an Object parameter.

It also works the other way, "auto-unboxing" you can directly modify primitives Wrapper Objects with primitive operations(i.e. +, -, /, %)

For example:

Integer myInt = new Integer( 10 ); // creates an Integer holding 100

int yourInt = myInt * 10; // yourInt is now a primative holding 100

myInt = myInt * 10; // myInt also holds 100