The type java.lang.String cannot be resolved. It is indirectly referencedfrom required .class files?

Error!]the type java.lang.String cannot be resolved. it is indirectly referenced from required .class files 有時候用myeclipse導入一個外來的工程時會出現以上錯誤，這主要是因爲你的電腦上安裝了多個版本的jdk，解決的辦法是：操作步驟： project->properties->Java

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