Java api 全集下载连接地址【API JDK1.6中文版】。J2SE DK & API下载
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http://java.sun.com/j2se/1.3/download.html

http://java.sun.com/j2se/1.4.2/download.html

http://java.sun.com/javase/downloads/index_jdk5.jsp

http://java.sun.com/javase/downloads/index.jsp

J2EE DK & API下载
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http://java.sun.com/j2ee/1.3/index.jsp

http://java.sun.com/j2ee/1.3/download.html

http://java.sun.com/j2ee/1.4/index.jsp

http://java.sun.com/j2ee/1.4/download.html

http://java.sun.com/javaee/downloads/index.jsp

JDK1.6API中文版（全）
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* HTML 格式(在线英文) http://java.sun.com/javase/6/docs/
* HTML 格式(在线中文) http://download.java.net/jdk/jdk-api-localizations/jdk-api-zh-cn/publish/1.6.0/html/zh_CN/api/index.html
* zip 格式(中文) http://download.java.net/jdk/jdk-api-localizations/jdk-api-zh-cn/publish/1.6.0/html_zh_CN.zip
* CHM 格式(中文) http://download.java.net/jdk/jdk-api-localizations/jdk-api-zh-cn/publish/1.6.0/chm/JDK_API_1_6_zh_CN.CHM
JDK1.5API中文版（全）
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* HTML 格式(在线英文) http://java.sun.com/javase/5/docs/
* HTML 格式(在线中文) http://gceclub.sun.com.cn/Java_Docs/html/zh_CN/api/index.html
* zip 格式(中文) http://gceclub.sun.com.cn/Java_Docs/html_zh_CN.zip
* CHM 格式(中文) http://download.java.net/jdk/jdk-api-localizations/jdk-api-zh-cn/builds/JDK_API_1_5_zh_CN.CHM

相关网站
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http://java.sun.com

http://gceclub.sun.com.cn/

http://developers.sun.com/downloads/

http://java.sun.com/javaee/downloads/

http://java.sun.com/javase/downloads/

http://www.netbeans.info/downloads/