Below are the methods to implement a Octet Class using Septet Class in Java:

Using direct values

// Java program to illustrate
// implementing Octet Class
// from Septet Class
// using direct values

import java.util.*;
import org.javatuples.*;

class Prutor {

public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = new Octet<String, String, String, String, String, String, String, String>(
"Octet",
septet.getValue0(),
septet.getValue1(),
septet.getValue2(),
septet.getValue3(),
septet.getValue4(),
septet.getValue5(),
septet.getValue6());

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Octet, Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Using Septet.add() method

// Java program to illustrate
// implementing Octet Class
// from Septet Class
// using Septet.add()

import java.util.*;
import org.javatuples.*;

class Prutor {
public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = septet.add("Octet");

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit, Octet]
Using Septet.addAtX() method
Program 1: Adding at Position 0 using addAt0()

// Java program to illustrate
// implementing Octet Class
// from Septet Class
// using Septet.addAtX()

import java.util.*;
import org.javatuples.*

class Prutor {
public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = septet.addAt0("Octet");

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Octet, Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Program 2: Adding at Position 1 using addAt1()

import java.util.*;
import org.javatuples.*;

class Prutor {
public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = septet.addAt1("Octet");

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Septet, Octet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Program 3: Adding at Position 2 using addAt2()

// Below is a Java program to demonstrate
// use of addAt2() method with
// direct value

import java.util.*;
import org.javatuples.*

class Prutor {
public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = septet.addAt2("Octet");

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Septet, Sextet, Octet, Quintet, Quartet, Triplet, Pair, Unit]
Program 4: Adding at Position 3 using addAt3()

// Below is a Java program to demonstrate
// use of addAt3() method with
// direct value

import java.util.*;
import org.javatuples.*

class Prutor {
public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = septet.addAt3("Octet");

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Septet, Sextet, Quintet, Octet, Quartet, Triplet, Pair, Unit]
Program 5: Adding at Position 4 using addAt4()

// Below is a Java program to demonstrate
// use of addAt4() method with
// direct value

import java.util.*;
import org.javatuples.*

class Prutor {
public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = septet.addAt4("Octet");

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Septet, Sextet, Quintet, Quartet, Octet, Triplet, Pair, Unit]
Program 6: Adding at Position 5 using addAt5()

// Below is a Java program to demonstrate
// use of addAt5() method with
// direct value

import java.util.*;
import org.javatuples.*

class Prutor {
public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = septet.addAt5("Octet");

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Septet, Sextet, Quintet, Quartet, Triplet, Octet, Pair, Unit]
Program 7: Adding at Position 6 using addAt6()

// Below is a Java program to demonstrate
// use of addAt6() method with
// direct value

import java.util.*;
import org.javatuples.*

class Prutor {
public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = septet.addAt6("Octet");

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Octet, Unit]
Program 8: Adding at Position 7 using addAt6()

// Below is a Java program to demonstrate
// use of addAt7() method with
// direct value

import java.util.*;
import org.javatuples.*

class Prutor {
public static void main(String[] args)
{
// Create Septet
Septet<String, String, String, String, String, String, String>
septet = new Septet<String, String, String, String, String, String, String>(
"Septet", "Sextet", "Quintet", "Quartet", "Triplet", "Pair", "Unit");

// Print the Septet
System.out.println("Septet: " + septet);

// Create Octet from Septet
Octet<String, String, String, String, String, String, String, String>
octet = septet.addAt7("Octet");

// Print the Octet
System.out.println("Octet: " + octet);
}
}
Output:

Septet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit]
Octet: [Septet, Sextet, Quintet, Quartet, Triplet, Pair, Unit, Octet]