Autoboxing and auto-unboxing are compiler modifications that permit previously illegal combinations of wrappers and primitives. : Boxing Unboxing « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. Boxing Unboxing

Boxing is the automatic assignment of a primitive value to a compatible wrapper type. 


public class MainClass {
  public static void main(String[] argv) {
    Integer wrappedInt = 25;

    // You can think of the line above as an abbreviation for

     wrappedInt = new Integer(25);

  }
}