Swing开发错误：Access restriction: The type JFrame is not accessible due to restriction on required libra

Swing开发错误：Access restriction: The type JFrame is not accessible due to restriction on required library C:\Program Files\Java\jre1.8.0_181\lib\rt.jar   错误原因： jre配置错误； 解决方案： 1. 项目右键 - Build Path - Confi

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