Java Community | Help. Code. Learn.•11mo ago

Week 56 — What is the unnamed package and what is special about it?

Question of the Week #56

What is the unnamed package and what is special about it?

3 Replies

Normally, Java classes are located in packages. This can be done by creating subdirectories in the source folder and creating the classes in these subdirectories. Classes within packages need to start with package followed by the name of the package which is a list of nested subdirectories separated by . ending with a ;. For example, a class Hello in a directory com/mypackage/hello could look like:

package com.mypackage.hello;

public class Hello{
  public static void main(String[] args){
    System.out.println("Hello World");
  }
}

package com.mypackage.hello;

public class Hello{
  public static void main(String[] args){
    System.out.println("Hello World");
  }
}

Eric McIntyre•11mo ago

If a class is located directly in the source folder, it is in the unnamed package. Classes in the unnamed package must not have a package declaration. Classes within the unnamed package cannot be imported. However, it is possible that a class in the unnamed package imports a class from a (named) package. Aside from that, these classes cannot be part of any module except the unnamed module (it is not possible to have a module-info.java and classes in the same directory).

📖 Sample answer from dan1st

Eric McIntyre•11mo ago

It's a special package that doesn't have a name. It is the package to which all classes belong that are not explicitly placed in a named package using the statement.

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Week 56 — What is the unnamed package and what is special about it?