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Java语言规范: http://docs.oracle.com/javase/specs/
Java API: http://docs.oracle.com/javase/8/docs/api/index.html (JDK1.8)
http://docs.oracle.com/javase/7/docs/api/index.html (JDK1.7)
http://docs.oracle.com/javase/6/docs/api/index.html (JDK1.6)
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原文地址：http://www.cnblogs.com/huhanbo/p/4862451.html
