June 2001
Intermediate to advanced
888 pages
21h 1m
English
Content preview from Java Cookbook
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Chapter 23. Packages and Packaging
Introduction
One of the better aspects of the Java language is that it has defined
a very clear packaging mechanism for categorizing and managing the
external API. Contrast this with a language like C, where external
symbols may be found in the C library itself or in any of dozens of
other libraries, with no clearly defined naming
conventions.[54]
APIs consist of one or
more packages;
packages consist of
classes; classes
consist of
methods and
fields. Anybody can create a package, with one important restriction:
you or I cannot create a package whose name begins with the four
letters java. Packages named
java.
or javax.
are reserved for use by Sun Microsystems’ Java developers. When
Java was new, there were about a dozen packages in a structure that
is very much still with us; some of these are shown in Table 23-1.
Table 23-1. Java packages basic structure
|
Name |
Function |
|---|---|
|
|
Applets for browser use |
|
|
Graphical User Interface |
|
|
Intrinsic classes (strings, etc.) |
|
|
Networking (sockets) |
|
|
Reading and writing |
|
|
Utilities (collections, date) |
Many packages have since been added, but the initial structure has stood the test of time fairly well. In this chapter I show you how to create and document your own packages, and then discuss a number of issues related to deploying your package in various ways on various platforms.
[54] This is not strictly true. On Unix, at least, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.