红色感叹号有几种错误,如果是jar包导入错误的话,可以参考链接:
https://blog.csdn.net/yql_617540298/article/details/107114861
右键项目,选择Build Path > Configure Build Path,如下图所示:
选中JRE System Library[JavaSE-1.8](unbound),然后选择Edit
红色感叹号有几种错误,如果是jar包导入错误的话,可以参考链接:
https://blog.csdn.net/yql_617540298/article/details/107114861
右键项目,选择Build Path > Configure Build Path,如下图所示:
选中JRE System Library[JavaSE-1.8](unbound),然后选择Edit