Java JDK 1.6 API 中文文档HTML版：点击下载

http://download.java.net/jdk/jdk-api-localizations/jdk-api-zh-cn/publish/1.6.0/html_zh_CN.zip

Java JDK 1.6 API 中文文档CHM版：点击下载

http://download.java.net/jdk/jdk-api-localizations/jdk-api-zh-cn/publish/1.6.0/chm/JDK_API_1_6_zh_CN.CHM