Create Subpackages (i.e. A Package inside another package)
We can also put a package inside an another package. The packages that comes lower in the naming hierarchy are called
"subpackage" of the corresponding package higher in the hierarchy i.e.
the package that we are putting into another package is called "subpackage".
The naming convention defines how to create a unique package name, so that packages that are widely used
with unique namespaces. This allows packages to be easily managed. Suppose we have a file called "HelloWorld.java". and want to store
it in a subpackage "subpackage", which stays inside package
"importpackage". The "HelloWorld"
class should look something like this:
package importpackage.subpackage;
public class HelloWorld {
public void show(){
System.out.println("This is the function of the class HelloWorld!!");
}
}
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Now import the
package "subpackage" in the class file "CallPackage"
shown as:
import importpackage.subpackage.*;
class CallPackage{
public static void main(String[] args){
HelloWorld h2=new HelloWorld();
h2.show();
}
}
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Out of the program:
C:\nisha>javac C:\nisha\importpackage\subpackage\HelloWorld.java
C:\nisha\importpackage\subpackage>cd..
C:\nisha\importpackage>cd..
C:\nisha>javac CallPackage.java
C:\nisha>java CallPackage
This is the function of the class HelloWorld!! |
Make sure to the directory structure for this program
shown as:
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