XML by Example

Interfaces and Multiple Inheritance

You have seen that Java supports only single inheritance: A class cannot

have more than one ancestor. Multiple inheritance in Java is based on

interfaces.

An interface is the skeleton of a class; it declares the methods that a class

must support but it does not provide the implementation. Implementation

of the methods must be provided in a class.

1. Many Java APIs are defined in terms of interfaces. Listing A.5 is one

of the interfaces defined by SAX.

Listing A.5: A SAX Interface

package org.xml.sax;

/**

* Receive notification of general document events.

* Most comments removed to simplify the listing.

*

* @author David ...