A basic wrapper classes in the Java programming language is a set of 8 in the java.lang package object class provides the method provides eight primitive types. All classes in Java in the original packaging is the same. J2SE5.0 automatically boxed into their basic types of packaging an object, and automatically unpacking the packaging object to its original value of implicit conversion between object packaging and the original values.
Packaging is used to represent the original value of an object is required. Widely used packaging collections classes in the java.util package, and reflected in the java.lang.reflect package.