步骤:
1.点击windows->show view->other,选择Navigator:

eclipse解决java compiler level does not match the version of the installed java project faceteclipse解决java compiler level does not match the version of the installed java project facet
选择报错的项目打开setting文件夹:
选择org.eclipse.jdt.core.prefs:将一下几处换成编译版本一样,我的编译版本是1.8,所以我需要把一下几处换成1.8。
eclipse解决java compiler level does not match the version of the installed java project facet
eclipse解决java compiler level does not match the version of the installed java project facet
至于如何查看编译版本:
点击windows->preperences->java->compiler:
eclipse解决java compiler level does not match the version of the installed java project facet

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