先检查jar包，jar包的地址如果不一样需要remove后重新导入的，右键项目→Build Path。
看额外的jar包有没有×，地址正不正确，要是不正确，remove错误jar包，再点击Add Extenal JARs
最后检查JDK的版本，当然是选自己电脑下载的版本了，点击环境的下拉菜单。
要是还有错误的话，我也没辙了，去看看别的教程吧。
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