JDK 7 API 下载

JDK 7 API 官方下载地址：

http://www.oracle.com/technetwork/java/javase/documentation/java-se-7-doc-download-435117.html

JDK 8 API 官方下载地址：

http://www.oracle.com/technetwork/java/javase/documentation/jdk8-doc-downloads-2133158.html

JDK及相关文档的下载都在这个页面：

http://www.oracle.com/technetwork/java/javase/downloads/index.html

Java Language and Virtual Machine Specifications

http://docs.oracle.com/javase/specs/