java.io.IOException cannot be resolved
可以考慮jre包的版本是不是不對 工程右鍵Properties，選擇java Build Path。 如果JRE System Library後面有紅色的符號，切換到libraries，選中錯誤的Remove，再點擊Add Library。 選擇JRE System Library。 點擊Finish，然後等工程重新編譯就好了。
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