Java Package Importing: Sub-packages Must Be Explicitly Imported

Beantwortet mit GPT-4o-mini von Java Q&A Hub

Frage:

In case a package has sub packages, will it suffice to import only the main package? e.g. Does importing of com.myMainPackage.* also import com.myMainPackage.mySubPackage.*?

Antwort:

In Java, importing a package does not automatically import its sub-packages. When you use an import statement like import com.myMainPackage.*;, it will import all the classes and interfaces in com.myMainPackage, but it will not import anything from com.myMainPackage.mySubPackage.

If you want to use classes from com.myMainPackage.mySubPackage, you need to explicitly import that sub-package as well. You can do this by adding another import statement, like:

import com.myMainPackage.mySubPackage.*;

Alternatively, if you want to import all classes from both the main package and the sub-package, you would need to include both import statements:

import com.myMainPackage.*;
import com.myMainPackage.mySubPackage.*;

In summary, you must import each package and sub-package explicitly if you want to use classes from them.

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