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JavaTuples indexOf() method

  • Last Updated : 27 Aug, 2018

The indexOf() method in org.javatuples is used to find the index of a value, passed as parameter, in TupleClass. This method takes the parameter of Object type, so that it can check for all type of values. It is inherited from the JavaTuple class. This method can be used to any tuple class object of javatuples library. It returns an int which is the first index of the value passed as the parameter, if found. If not found, then it returns -1.

Method Declaration:

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public final int indexOf(Object value)

Syntax:

int index = TupleClassObject.indexOf(Object value)

Here TupleClassObject represents the JavaTuple Class object used like Unit, Quintet, Decade, etc.



Return Value: This method returns an int which is the first index of the value passed as the parameter, if found. If not found, then it returns -1.

Below programs illustrate the various ways to use indexOf() method:

Program 1: Using indexOf() with Unit class:




// Below is a Java program to use indexOf() method
  
import java.util.*;
import org.javatuples.Unit;
  
class GfG {
    public static void main(String[] args)
    {
        // Creating an Unit with one value
        Unit<String> unit = Unit.with("GeeksforGeeks");
  
        // Using indexOf() method for present value
        int index1 = unit.indexOf("GeeksforGeeks");
  
        // Printing the index1
        System.out.println("Index of GeeksforGeeks = "
                           + index1);
  
        // Using indexOf() method for absent value
        int index2 = unit.indexOf("Present");
  
        // Printing the index2
        System.out.println("Index of Present = "
                           + index2);
    }
}

Output:

Index of GeeksforGeeks = 0
Index of Present = -1

Program 2: Using indexOf() with Quartet class:




// Below is a Java program to use indexOf() method
  
import java.util.*;
import org.javatuples.Quartet;
  
class GfG {
    public static void main(String[] args)
    {
        // Creating a quartet
        Quartet<Integer, String, String, Double> quartet
            = Quartet.with(Integer.valueOf(1),
                           "GeeksforGeeks",
                           "A computer portal",
                           Double.valueOf(20.18));
  
        // Using indexOf() method for present value
        int index1 = quartet.indexOf("GeeksforGeeks");
  
        // Printing the index1
        System.out.println("Index of GeeksforGeeks = "
                           + index1);
  
        // Using indexOf() method for absent value
        int index2 = quartet.indexOf(5);
  
        // Printing the index2
        System.out.println("Index of 5 = "
                           + index2);
    }
}

Output:

Index of GeeksforGeeks = 1
Index of 5 = -1

Note: Similarly, it can be used with any other JavaTuple Class.




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