java - Do we ever need empty class in java project? If yes then why?

Question

In empty class (without field and properties) also compiler automatically creates a default constructor after compiling. If we never use this empty class then why compiler creates this default constructor?

Answer 1

我们可以将其用作类型标记，例如：

class DatabaseColumnName {}
class DatabaseTableName {}
addItem(DatabaseColumnName.class, "Age")
addItem(DatabaseTableName.class, "Person")
...
getItemsByType(DatabaseTableName.class)

此外，阅读其他语言的用法以更深入地了解空类：

Kotlin：Kotlin中空类的目的是什么？

C#：C++ 中空类的优点