问题：
打入JFrame时候，会报错：Access restriction: The type ‘Resource‘ is not API (restriction on required library ‘G:\JAVA\jdk\lib
解决方式：
项目属性preferences>java build path>把右侧【libraries中的JRE System Library】删除重新导入.
Access restriction: The type 'Resource' is not API (restriction on required library 'G:\JAVA\jdk\lib
原文：https://www.cnblogs.com/bukechuji/p/10986648.html