Create a package, Add the necessary classes and import the package in java class.

How to create a package

At first create a folder like a name <cei> and store a program.

Listing 1: Sample showing Example using package. This is the package program

armstrong.java
public class armstrong
{
 int x=407;
 int r,temp,a=0;
 public void test()
 {
 temp=x;
 while(x>0)
 {
  r=x%10;
  a=a+(r*r*r);
  x=x/10;
 }
 if(temp==a)
 {
  System.out.println("This is Armstrong no..");
 }
else
{
  System.out.println("This is not Armstrong no..");
} 
} 
}

After the creation of the program then compile this program with following syntax:

javac  armstrong.java

If compile this part with successfully then write down this program.

Listing 2: Sample showing Example calling package

cal.java
import cei.*;
public class cal{
    public static void main(String args[]){
    armstrong ob=new armstrong();
    ob.test(); //this part is calling package method
    }
}

Then compile the code cal.java

javac  cal.java

After that we interpreting this program cal.java

java  cal

Then this call.java will be interpreted and run this program and show the output

Output:

This is Armstrong no.