Implement Pair Class with Unit Class in Java using JavaTuples

Last Updated : 11 Jul, 2025

To implement a Pair class with a Unit class in Java using JavaTuples, you can use the Pair class provided by the library and create a new Unit class that extends the Unit class provided by the library.

Here is an example implementation:

Here is an example Java code that uses the MyPair class with MyUnit and displays the output:

Java

import org.javatuples.Pair;
import org.javatuples.Unit;

public class Main {
    
    public static void main(String[] args) {
        
        MyPair<String, Integer> pair1 = new MyPair<>("John", 42);
        MyPair<MyUnit, Integer> pair2 = new MyPair<>(new MyPair.MyUnit(), 10);
        
        System.out.println("Pair 1: " + pair1);
        System.out.println("Pair 2: " + pair2);
        
        String name = pair1.getValue0();
        int age = pair1.getValue1();
        
        System.out.println(name + " is " + age + " years old.");
    }
    
    public static class MyPair<A, B> extends Pair<A, B> {
        
        public MyPair(A a, B b) {
            super(a, b);
        }
        
        public static class MyUnit extends Unit {
            
            public MyUnit() {
                super();
            }
        }
    }
}

Output:

Pair 1: (John, 42)
Pair 2: (( ), 10)
John is 42 years old.

A Pair is a Tuple from the JavaTuples library that deals with 2 elements. Since this Pair is a generic class, it can hold any type of value in it. A Unit is a Tuple from the JavaTuples library that deals with only 1 element. Since this Unit is a generic class, it can hold any type of value in it.

Different Ways to implement Pair Class with Unit Class

Using direct values
Using add() method of Unit class
Using addAtX() method of Unit class

Method 1: Using Direct Values

Example:

Java

// Java Program to Implement Pair 
// Class with Unit Class
// Using JavaTuples Via Direct Values

// Importing required classes
import java.util.*;
import org.javatuples.*;

// Main class
class GFG {

    // Main driver method
    public static void main(String[] args)
    {

        // Creating a Unit
        Unit<String> unit
            = new Unit<String>("GeeksforGeeks");

        // Printing unit
        System.out.println("Unit: " + unit);

        // Creating Pair from Unit
        Pair<Integer, String> pair
            = new Pair<Integer, String>(Integer.valueOf(1),
                                        unit.getValue0());

        // Printing the Pair
        System.out.println("Pair: " + pair);
    }
}

Output:

Unit: [GeeksforGeeks]
Pair: [1, GeeksforGeeks]

Method 2: Using add() Method of Unit class

Example:

Java

// Java Program to Implement Pair Class with Unit Class
// use of add() method with Single Value

// Importing required classes
import java.util.*;
import org.javatuples.*;

// Main class
class GFG {

    // Main driver method
    public static void main(String[] args)
    {

        // Instantiate unit object
        // using with() method
        Unit<String> unit = Unit.with("Geeks");

        // Printing unit
        System.out.println("Unit: " + unit);

        // Create Pair Using add() method
        Pair<String, String> pair = unit.add("forGeeks");

        // Print the Pair
        System.out.println("Pair: " + pair);
    }
}

Output:

Unit: [Geeks]
Pair: [Geeks, forGeeks]

Method 3: Using addAtX() method of Unit class

Example 1: Adding Unit at Position 0 using addAt0()

Java

// Java program to Implement Pair Class with Unit Class
// By using of addAt0() method with Direct Value

// Importing required classes
import java.util.*;
import org.javatuples.Pair;
import org.javatuples.Unit;

// Main class
class GFG {

    // Main driver method
    public static void main(String[] args)
    {

        // Instantiate unit object
        // using with() method
        Unit<String> unit = Unit.with("Geeks");

        // Printing unit
        System.out.println("Unit: " + unit);

        // Creating Pair using addAtX() method
        Pair<String, String> pair = unit.addAt0("forGeeks");

        // Printing the Pair
        System.out.println("Pair: " + pair);
    }
}

Output:

Unit: [Geeks]
Pair: [forGeeks, Geeks]

Example 2: Adding Unit at Position 1 using addAt1()

Java

// Java program to Implement 
// Pair Class with Unit Class
// Via addAt1() method with 
// Direct Value

// Importing required classes
import java.util.*;
import org.javatuples.Pair;
import org.javatuples.Unit;

// Main class
class GFG {

    // Main driver method
    public static void main(String[] args)
    {
        // Instantiate unit object
        // using with() method
        Unit<String> unit = Unit.with("Geeks");

        // Printing Unit
        System.out.println("Unit: " + unit);

        // Creating Pair
        // Using addAtX() method
        Pair<String, String> pair = unit.addAt1("forGeeks");

        // Printing the Pair
        System.out.println("Pair: " + pair);
    }
}

Output:

Unit: [Geeks]
Pair: [Geeks, forGeeks]

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Implement Pair Class with Unit Class in Java using JavaTuples

Here is an example implementation:

Different Ways to implement Pair Class with Unit Class

Method 1: Using Direct Values

Method 2: Using add() Method of Unit class

Method 3: Using addAtX() method of Unit class

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