CSC/ECE 517 Fall 2011/ch1 1i cl

Introduction

In O-o languages Object-oriented languages, method is a subroutine that associates with the the class and defines the behaviors performed by the instances of the class. A ancestor class may has its descendant classes which inherit all its methods' propertiess(name,return type,etc). Method reimplementation is required when the decendent class needs to change the behavior of a method which was already implemented by the ancestor class, and it is more efficient to do so other than writing a new method. In different O-o languages, the ways to require or allow a class to reimplement methods are very different. So it is important for us to know how different languages handle the reimplementation and what are the advantages and disadvantages of them.

Reimplementation in different O-o languages

Java

General

In Java, we can use variaty of approaches to do the reimplementation. We still have approaches like Overridden Methods and Virtual Methods the same as what we have in C++, while there are some other convinient approaches such as interface and overloading methods which C++ doesn't support.

See also

The JavaTM Tutorials http://download.oracle.com/javase/tutorial/index.html