如何在 Go 中使用不同套件中的類型？

Importing Packages and Types

In Go, a common issue arises when attempting to import a type from a different package. This problem is highlighted by the following code structure:

src
|-->config
       |--> config.go
|-->otherPackage
       |--> otherFile.go
|-->main.go

The goal is to use a type declared in config.go within the otherFile.go file. However, importing config within otherFile.go leads to errors such as "imported and not used" and "undefined: Config."

Go does not support importing specific types from a package. Instead, you must import the entire package, thus qualifying any type references with the package name, like so:

import (
    "fmt"
    "math"
    "./config"
)

Using this import statement, you can reference the type Config from config.go using the fully qualified name config.Config. Alternatively, to prevent shadowing, you can:

1. Rename the config variable to something else (e.g., cfg).
2. Reference Config using its qualified name, config.Config.

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