Specifications

Sun Services

Java™ Programming Language

Module 6, slide 43 of 43

Autoboxing of Primitive Types

Autoboxing has the following description:

• Conversion of primitive types to the object equivalent

• Wrapper classes not always needed

• Example:

int pInt = 420;

Integer wInt = pInt; // this is called autoboxing

int p2 = wInt; // this is called autounboxing

• Language feature used most often when dealing with

collections

• Wrapped primitives also usable in arithmetic

expressions

• Performance loss when using autoboxing