.1 . 进入eclipse界面,依次点击 Window – Preferences – Java – Installed JREs

图解 eclipse 查看原始类出现 the JAR file rt.jar has no source attachment

2.选中 D:\java\lib\rt.jar ,然后选择 Source Attachment

图解 eclipse 查看原始类出现 the JAR file rt.jar has no source attachment

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