project 编译问题，需要三处的jdk版本要保持一致，才能编译通过。
1、在项目上右键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
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