java 運行報錯has been compiled by a more recent version of the Java Runtime (class file version 54.0)

java 運行報錯has been compiled by a more recent version of the Java Runtime (class file version 54.0) 在項目的屬性裏設置jdk版本,方法是右擊項目–>properties–>java compiler --> Enable project specific settings -->將compiler co
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