出現The public type c must be defined in its own file這個問題，是由於定義的JAVA類同文件名不一致
你的文件里很可能有兩個 public 的類，而Java文件里只允許出現一個 public 類
解決方法：
1、把文件名修改同公共類一樣的名字；
2、把類名修改成同文件名；
3.子類繼承父類時，不需要再用public修飾
Java報錯 -- The public type c must be defined in its own file
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