Java 트위터 라이브러리 로는 Twitter4J , java-twitter , jtwitter , Twitter Client 의 총 4가지를 존재하고 있습니다.
이 중에서 Twitter4J를 선택한 것은 문서화가 잘 되어 있고, 지속적으로 업데이트가 되고 있기 때문입니다.

Twitter4J is an unofficial Java library for the Twitter API.
With Twitter4J, you can easily integrate your Java application with the Twitter service. Twitter4J is an unofficial library.
http://twitter4j.org/en/index.jsp

Twitter4J is featuring:
✔ 100% Pure Java - works on any Java Platform version 1.4.2 or later
✔ Android platform and Google APP Engine ready
✔ Zero dependency : No additional jars required
✔ Built-in OAuth support
✔ Out-of-the-box gzip support

JTwitter is a small library providing easy access to the Twitter API. Set and get your status, manage your network of friends, message friends, maintain lists, etc. Lots of features - if you can do it at twitter.com, you can probably do it with JTwitter.

http://www.winterwell.com/software/jtwitter.php

The library - version 1.6 - can be downloaded here: [jtwitter.jar]

Java Twitter

A Java wrapper around the Twitter API

Author: DeWitt Clinton dewitt@unto.net

http://code.google.com/p/java-twitter/

Introduction

This library provides a pure Java interface for the Twitter API.

Twitter (http://twitter.com) provides a service that allows people to connect via the web, IM, and SMS. Twitter exposes a web services API (http://twitter.com/help/api) and this library is intended to make it even easier for java programmers to use.

Java client to connect to the Twitter Streaming API.

TwitterClient uses Jakarta Commons HttpClient 3.1, http://hc.apache.org/httpclient-3.x/. It backs off and reconnects on HTTP and TCP errors as per the spec. It can connect using multiple sets of credentials at once. Actual processing of the Twitter stream is provided a help object

http://gistinc.github.com/TwitterClient/