eclipse报错java compiler level does not match the version of the installed java project

java compiler level does not match the 

version of the installed java project

解决办法:
右键项目“Properties”,在弹出的“Properties”窗口左侧,单击“Project Facets”,打开“Project Facets”页面。

在页面中的“Java”下拉列表中,选择相应版本就OK了

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