Autoboxing/unboxing: an argument passed to a method or returned from a method : Autobox Unbox « Data Type « Java Tutorial

Autoboxing/unboxing takes place with method parameters and return values.

public class MainClass {
  static int m(Integer v) {
    return v ; // auto-unbox to int
  } 

  public static void main(String args[]) {
    Integer iOb = m(100);

    System.out.println(iOb);
  }
}

2.18.Autobox Unbox
	2.18.1.	Type conversion (JDK1.5 Autoboxing/Unboxing)
	2.18.2.	Boxing and Unboxing
	2.18.3.	Autoboxing and Auto-Unboxing
	2.18.4.	Manually boxes the value 100 into an Integer
	2.18.5.	The modern way to construct an Integer object that has the value 100
	2.18.6.	To unbox an object
	2.18.7.	Autoboxing/unboxing: an argument passed to a method or returned from a method
	2.18.8.	Autoboxing/unboxing occurs inside expressions
	2.18.9.	Auto-unboxing: mix different types of numeric objects in an expression.
	2.18.10.	Using an integer object to control a switch statement
	2.18.11.	Autoboxing/Unboxing Boolean and Character Values
	2.18.12.	Autoboxing/unboxing takes place with method parameters and return values.
	2.18.13.	Auto-unboxing allows you to mix different types of numeric objects in an expression.