The public type Square must be defined in its own file

This error message means that you have defined a public class called "Square" in a file where other classes are also defined. To resolve this error, move the definition of the "Square" class into its own file, separate from the other classes.

Here's an example of what the file structure might look like:

- Square.java (contains the definition of the public class "Square")
- OtherClass1.java (contains the definition of another class)
- OtherClass2.java (contains the definition of another class)

By separating the definition of the "Square" class into its own file, you can ensure that it is properly encapsulated and can be easily reused in other parts of your code.

相关问题

The public type singleTon must be defined in its own file

This statement is not entirely true. While it is true that it is a common practice to define a singleton class in its own file, it is not a requirement or a rule that must be followed.

A singleton class is a class that can have only one instance, and it is often used in scenarios where you want to ensure that there is only one instance of a class in the entire application.

The implementation of a singleton class can vary depending on the programming language and the specific requirements of the application. In some cases, it may make sense to define the singleton class in the same file as other related classes or in a file that contains utility classes.

However, it is important to note that defining a singleton class in its own file can help to improve the clarity and organization of the code. It can also make it easier to maintain and modify the singleton class in the future.

The public type ReadFileExample must be defined in its own file

这是一个错误提示，意思是在定义名为 ReadFileExample 的公共类型时，该类型必须在自己的文件中进行定义。也就是说，不能将该类型的定义放在其他文件中。这是因为公共类型需要在其它文件中使用，如果该类型的定义不在其自己的文件中，则其它文件无法访问该类型的定义。要解决这个问题，你需要将名为 ReadFileExample 的公共类型定义移到一个独立的文件中，并确保该文件被正确引用。