原因：項目中JDK使用的版本與現在使用的JDK版本不同所致。
解決方法:右鍵選擇項目》properties>java Build Path>Libraries 查看下面的JRE System Library 是不是有紅色的提示。肯定有把，選擇它。刪除。。右邊 Add Libraty 重新添加一個就好了
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