Java Illuminated, 5th Edition

10.8 Interfaces

In Java, a class can inherit directly from only one class; that is, a class can extend only one class. To allow a class to inherit behavior from multiple sources, Java provides the interface. Interfaces are often used to provide a specification for performing common tasks. They can also be used to promote code reusability.

An interface typically specifies behavior that a class will implement.

Interface members can be any of the following:

• constants

• methods

• classes

• other interfaces

To define an interface, we use the following syntax:

accessModifier interface InterfaceName
{
    // body of interface
}

Like classes, the Java convention is to name interfaces starting with a capital letter and capitalizing internal words.

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