Java 2™ Programmer Exam Cram™ 2 (Exam CX-310-035)

Introduction

The designers of Java decided at an early stage that Java classes would have single inheritance—in other words, each class has only one parent class. Sometimes in object-oriented programming, you want a class to partake of the methods of more than one parent. In Java 1, this was supplied to some extent by the concept of interfaces, but in Java 1.1, the designers found it necessary to add the concept of nested classes.