swing - openjdk 8 : error - No public or protected classes found to document

Question

我在 Debian 上，并且已经安装了 OpenJDK 8 以及软件包 openjdk-8-doc 和 default -jdk文档；但是，每当我向 javadoc 实用程序指定类或包名称时，我都无法查看 JDK 8 API 类的任何文档，它无法显示文档抛出以下错误:

1. ArrayList 案例:

   kais@debian:~$ javadoc ArrayList
   Loading source files for package ArrayList...
   javadoc: warning - No source files for package ArrayList
   Constructing Javadoc information...
   javadoc: warning - No source files for package ArrayList
   javadoc: error - No public or protected classes found to document.
   1 error
   2 warnings
   kais@debian:~$ javadoc java.lang.ArrayList
   Loading source files for package java.lang.ArrayList...
   javadoc: warning - No source files for package java.lang.ArrayList
   Constructing Javadoc information...
   javadoc: warning - No source files for package java.lang.ArrayList
   javadoc: error - No public or protected classes found to document.
   1 error
   2 warnings
   

2. JPanel 案例:

   kais@debian:~$ javadoc JPanel
   Loading source files for package JPanel...
   javadoc: warning - No source files for package JPanel
   Constructing Javadoc information...
   javadoc: warning - No source files for package JPanel
   javadoc: error - No public or protected classes found to document.
   1 error
   2 warnings
   kais@debian:~$ javadoc javax.swing.JPanel
   Loading source files for package javax.swing.JPanel...
   javadoc: warning - No source files for package javax.swing.JPanel
   Constructing Javadoc information...
   javadoc: warning - No source files for package javax.swing.JPanel
   javadoc: error - No public or protected classes found to document.
   1 error
   2 warnings
   kais@debian:~$ javadoc javax.swing
   Loading source files for package javax.swing...
   javadoc: warning - No source files for package javax.swing
   Constructing Javadoc information...
   javadoc: warning - No source files for package javax.swing
   javadoc: error - No public or protected classes found to document.
   1 error
   2 warnings
   

这在我看来很奇怪，因为安装包 openjdk-8-doc 应该包含 javadoc 所需的文档 ..

有什么想法吗？

Answer 1

Javadoc 工具应该从 Java 源代码创建 Javadoc。它不是显示特定类的 javadoc 的工具。 JVM 中类的 Javadoc 可在 Oracle 下载。或者可以浏览online .

正如你在问题中所说，你“安装”了相应JDK的文档，因此无需再次下载或在线浏览，你可以切换到文档包的“安装目录”并打开index-html 文件应该在其根目录下。