Description ResourcePath Location Type ...project facets version
project 编译问题

1、properties->project Facets->修改右侧的version 保持一致

2、window->preferences->java->Compiler->设置右侧的Compiler compliance level

3、window->preferences->java->Installed JREs->设置或者选择右侧的Installed JREs

以上三处的jdk版本要保持一致，才能编译通过