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Triplet Class in JavaTuples

A Triplet is a Tuple from JavaTuples library that deals with 3 elements. Since this Triplet is a generic class, it can hold any type of value in it.

Since Triplet is a Tuple, hence it also has all the characterstics of JavaTuples:

  • They are Typesafe
  • They are Immutable
  • They are Iterable
  • They are Serializable
  • They are Comparable (implements Comparable<Tuple>)
  • They implement equals() and hashCode()
  • They also implement toString()

Class Declaration

public final class Triplet<A, B, C> extends Tuple
    implements IValue0<A>, IValue1<B>, IValue2<C>

Class Hierarchy

Object
  ↳ org.javatuples.Tuple
      ↳ org.javatuples.Triplet<A, B, C>

Creating Triplet Tuple

  • From Constructor:
    Syntax:

    Triplet<A, B, C> triplet = 
        new Triplet<A, B, C>(value1, value2, value3);
    

    Example:

    // Below is a Java program to create
    // a Triplet tuple from Constructor
      
    import java.util.*;
    import org.javatuples.Triplet;
      
    class GfG {
        public static void main(String[] args)
        {
            Triplet<Integer, String, String> triplet
                = new Triplet<Integer, String, String>(Integer.valueOf(1), 
                                    "GeeksforGeeks", "A computer portal");
      
            System.out.println(triplet);
        }
    }

    Output:



    [1, GeeksforGeeks, A computer portal]
    
  • Using with() method: The with() method is a function provided by the JavaTuples library, to instantiate the object with such values.

    Syntax:

    Triplet<type1, type2, type3> triplet = 
           Triplet.with(value1, value2, value3);
    

    Example:

    // Below is a Java program to create
    // a Triplet tuple from with() method
      
    import java.util.*;
    import org.javatuples.Triplet;
      
    class GfG {
        public static void main(String[] args)
        {
            Triplet<Integer, String, String> triplet
                = Triplet.with(Integer.valueOf(1),
                               "GeeksforGeeks", "A computer portal");
      
            System.out.println(triplet);
        }
    }

    Output:

    [1, GeeksforGeeks, A computer portal]
    
  • From other collections: The fromCollection() method is used to create a Tuple from a collection, and fromArray() method is used to create from an array. The collection/array must have the same type as of the Tuple and the number of values in the collection/array must match the Tuple class.

    Syntax:

    Triplet<type1, type2, type3> triplet = 
        Triplet.fromCollection(collectionWith_2_value);
    
    Triplet<type1, type2, type3> triplet = 
        Triplet.fromArray(arrayWith_2_value);
    

    Example:

    // Below is a Java program to create
    // a Triplet tuple from Collection
      
    import java.util.*;
    import org.javatuples.Triplet;
      
    class GfG {
        public static void main(String[] args)
        {
            // Creating Triplet from List
            List<String> list = new ArrayList<String>();
            list.add("GeeksforGeeks");
            list.add("A computer portal");
            list.add("for geeks");
      
            Triplet<Strin, String, String> triplet
                = Triplet.fromCollection(list);
      
            // Creating Triplet from Array
            String[] arr = { "GeeksforGeeks",
                             "A computer portal",
                             "for geeks" };
      
            Triplet<String, String, String> otherTriplet
                = Triplet.fromArray(arr);
      
            System.out.println(triplet);
            System.out.println(otherTriplet);
        }
    }

    Output:

    [GeeksforGeeks, A computer portal, for geeks]
    [GeeksforGeeks, A computer portal, for geeks]
    

Getting Value

The getValueX() method can be used to fetch the value in a Tuple at index X. The indexing in Tuples start with 0. Hence the value at index X represents the value at position X+1.

Syntax:

Triplet<type1, type2, type3> triplet = 
    new Triplet<type1, type2, type3>(value1, value2, value3);

type1 val1 = triplet.getValue0();

Example:

// Below is a Java program to get
// a Triplet value
  
import java.util.*;
import org.javatuples.Triplet;
  
class GfG {
    public static void main(String[] args)
    {
        Triplet<Integer, String, String> triplet
            = Triplet.with(Integer.valueOf(1),
                           "GeeksforGeeks",
                           "A computer portal");
  
        System.out.println(triplet.getValue0());
        System.out.println(triplet.getValue2());
    }
}

Output:



1
A computer portal

Setting Triplet Value

Since the Tuples are immutable, it means that modifying a value at an index is not possible. Hence, JavaTuples offer setAtX(value) which creates a copy of the Tuple with a new value at index X, and returns that Tuple.

Syntax:

Triplet<type1, type2, type3> triplet = 
    new Triplet<type1, type2, type3>
                (value1, value2, value3);

Triplet<type1, type2, type3> 
    otherTriplet = triplet.setAtX(value);

Example:

// Below is a Java program to set
// a Triplet value
   
import java.util.*;
import org.javatuples.Triplet;
   
class GfG {
    public static void main(String[] args)
    {
        Triplet<Integer, String, String> triplet
            = Triplet.with(Integer.valueOf(1), "GeeksforGeeks"
                                          "A computer portal");
   
        Triplet<Integer, String, String> otherTriplet
            = triplet.setAt1("A computer portal for geeks");
   
        System.out.println(otherTriplet);
    }
}

Output:

[1, GeeksforGeeks, A computer portal for geeks]

Adding a Value

Adding a value can be done with the help of addAtX() method, where X represent the index at which the value is to be added. This method returns a Tuple of element one more than the called Tuple.

Syntax:

Triplet<type1, type2, type3> triplet = 
    new Triplet<type1, type2, type3>(value1, value2, value3);

Quartet<type 1, type 2, type 3, type 4> quartet = 
    triplet.addAt3(value);

Example:

// Below is a Java program to add
// a value
  
import java.util.*;
import org.javatuples.Triplet;
import org.javatuples.Quartet;
  
class GfG {
    public static void main(String[] args)
    {
        Triplet<Integer, String, String> triplet
            = Triplet.with(Integer.valueOf(1),
                           "GeeksforGeeks",
                           "A computer portal");
  
        Quartet<Integer, String, String, String> quartet
            = triplet.addAt3("for geeks");
  
        System.out.println(quartet);
    }
}

Output:

[1, GeeksforGeeks, A computer portal, for geeks]

Searching in Triplet

An element can be searched in a tuple with the pre-defined method contains(). It returns a boolean value whether the value is present or not.

Syntax:



Triplet<type1, type2, type3> triplet = 
    new Triplet<type1, type2, type3>(value1, value2, value3);

boolean res = triplet.contains(value2);

Example:

// Below is a Java program to search
// a value in a Triplet
  
import java.util.*;
import org.javatuples.Triplet;
  
class GfG {
    public static void main(String[] args)
    {
        Triplet<Integer, String, String> triplet
            = Triplet.with(Integer.valueOf(1),
                           "GeeksforGeeks",
                           "A computer portal");
  
        boolean exist = triplet.contains("GeeksforGeeks");
        boolean exist1 = triplet.contains(4);
  
        System.out.println(exist);
        System.out.println(exist1);
    }
}

Output:

true
false

Iterating through Triplet

Since Triplet implement the Iterable<Object> interface. It means that they can be iterated in the same way as collections or arrays.

Syntax:

Triplet<type1, type2, type3> triplet = 
    new Triplet<type1, type2, type3>(value1, value2, value3);

for (Object item : triplet) {
        ...
}

Example:

// Below is a Java program to iterate
// a Triplet
  
import java.util.*;
import org.javatuples.Triplet;
  
class GfG {
    public static void main(String[] args)
    {
        Triplet<Integer, String, String> triplet
            = Triplet.with(Integer.valueOf(1),
                           "GeeksforGeeks",
                           "A computer portal");
  
        for (Object item : triplet)
            System.out.println(item);
    }
}

Output:

1
GeeksforGeeks
A computer portal




This article is attributed to GeeksforGeeks.org

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