JAVA PROGRAMMING
Defining an Interface
The following figure shows that an interface
definition has two components: the interface declaration and the interface
body. The interface declaration declares various attributes about the
interface such as its name and whether it extends another interface. The
interface body contains the constant and method declarations within that
interface.
The Interface Declaration
The declaration for the Sleeper interface uses the
two required elements of an interface declaration--the interface keyword
and the name of the interface--plus the public access modifier :
public interface interface-name {
. . .
}
An interface declaration can have one other component: the public access
specifier and a list of superinterfaces.
The public access specifier indicates that the
interface can be used by any class in any package. If you do not specify
that your interface is public, then your interface will be accessible only
to classes that are defined in the same package as the interface.
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