運行結果是：
錯誤: 找不到或無法加載主類 base_7duixiang.Thiis
原因: java.lang.ClassNotFoundException: base_7duixiang.Thiis
原因是：同一個包內，使用的類名有重復，導致的報錯，更改為正確的類名即可。
報錯：Errors occurred during the build. Errors running builder 'Java Builder' on project 'base7'. java.lang.NullPointerException
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