进入 Oracle 官网 https://www.oracle.com/
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选择
Support/Documentation，进入到 https://docs.oracle.com/en/
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点击
Java，进入到 https://docs.oracle.com/en/java/index.htmloracle-java.png
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点击
Java SE Licensing Information，进入到 https://www.oracle.com/java/technologies/javase-documentation.htmloracle-javase.png
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点击
Overview，进入到 https://www.oracle.com/java/technologies/java-se-glance.html，当然了，这里也可以直接点击Downloads然后跳过下面的一步oracle-javase-docs-overview.png
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点击
Java Platform, Standard Edition 8，进入到 https://www.oracle.com/java/technologies/javase-downloads.html#JDK8oracle-javase-8.png
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点击
Documentation，进入到 https://docs.oracle.com/javase/8/oracle-javase-8-docs.png
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点击
Java Language and Virtual Manchine Specifications，进入到 https://docs.oracle.com/javase/specs/index.htmloracle-javase-8-docs-spec.png
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找到 Java SE 8，比如这里点击
HTML，进入到 https://docs.oracle.com/javase/specs/jvms/se8/html/index.htmloracle-javase-8-docs-spec-html.png
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然后点击对应的章节内容就可以查看了，比如要查看
class 文件格式，点击，进入到 https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.html#jvms-2.1oracle-javase-8-docs-spec-classfiles.png
