Java中的靜態類 - Static Classes In Java

問題：

Is there anything like static class in java? java中是否有相似static class東西？

What is the meaning of such a class. 這樣的課是什麼意思。 Do all the methods of the static class need to be static too? 靜態類的全部方法是否也必須是static ？

Is it required the other way round, that if a class contains all the static methods, shall the class be static too? 是否須要反過來，若是一個類包含全部靜態方法，那麼該類也應該是靜態的嗎？

What are static classes good for? 靜態類有什麼用？

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解決方案：

參考一： https://stackoom.com/question/VPS8/Java中的靜態類
參考二： https://oldbug.net/q/VPS8/Static-Classes-In-Java