Using Classes and Objects - Java Software Solutions: Foundations of Program Design - page 124

FIGURE 3.3

A page from the online Java API documentation

to get comfortable navigating this site and learning how the information is orga-
nized. The entire set of Java API documentation can be downloaded so that you
have a local copy always available, or you can rely on the online version.

Declaration
The classes of the java.lang package are automatically available for use when
writing a Java program. To use classes from any other package, however, we
must either fully qualify the reference or use an import declaration . Recall that
the example programs that use the Scanner class include an import declaration.
When you want to use a class from a class library in a program, you could
use its fully qualified name, including the package name, every time it is ref-
erenced. For example, every time you want to refer to the Scanner class that
is defined in the java.util package, you could write java.util.Scanner .
However, completely specifying the package and class name every time it is
needed quickly becomes tiring. Java provides the import declaration to simplify
these references.

The

import