最近经常遇到cannot be resolved to a type （Java）报错，以下为在网上找到的解决方案：
1.先看看有没有引用相关jar包
2.检查jar是否引用了多个相同的，或者多个jar中含有相同的类（包名和类名都相同）
3.在 Package Explorer 模式下右键src(出错的资源包)->Source->Organize Imports
如图：
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