Java Guava | Floats.lastIndexOf() method with Examples

Last Updated : 11 Jul, 2025
The lastIndexOf() method of Floats Class in Guava library is used to find the last index of the given float value in a float array. This float value to be searched and the float array in which it is to be searched, both are passed as a parameter to this method. It returns an integer value which is the last index of the specified float value. If the value is not found, it returns -1. Syntax: 
public static int lastIndexOf(float[] array,
                              float target)
Parameters: This method accepts two mandatory parameters:
  • array: which is the array of float values in which the float value is to searched.
  • target: which is float value to be searched for last index in the float array.
Return Value: This method returns an integer value which is the last index of the specified float value. If the value is not found, it returns -1. Below programs illustrates this method: Example 1: Java 
// Java code to show implementation of
// Guava's Floats.lastIndexOf() method

import com.google.common.primitives.Floats;
import java.util.Arrays;

class GFG {

    // Driver's code
    public static void main(String[] args)
    {

        // Creating a float array
        float[] arr = { 1.2f, 2.2f, 3.2f, 4.2f,
                        3.2f, 5.6f, 3.2f, 4.4f };

        float target = 3.2f;

        // Using Floats.lastIndexOf() method
        // to get the index of last appearance
        // of a given element in array
        // and return -1 if element is
        // not found in the array
        int index
            = Floats.lastIndexOf(arr, target);

        if (index != -1) {
            System.out.println("Target is present"
                               + " at index "
                               + index);
        }
        else {
            System.out.println("Target is not present"
                               + " in the array");
        }
    }
}
Output: 
Target is present at index 6
Example 2: Java 
// Java code to show implementation of
// Guava's Floats.lastIndexOf() method

import com.google.common.primitives.Floats;
import java.util.Arrays;

class GFG {

    // Driver's code
    public static void main(String[] args)
    {
        // Creating a float array
        float[] arr = { 1.2f, 2.2f, 3.2f, 4.2f,
                        3.2f, 5.6f, 3.2f, 4.4f };

        float target = 10.2f;

        // Using Floats.lastIndexOf() method
        // to get the index of last appearance
        // of a given element in array
        // and return -1 if element is
        // not found in the array
        int index
            = Floats.lastIndexOf(arr, target);

        if (index != -1) {
            System.out.println("Target is present"
                               + " at index "
                               + index);
        }
        else {
            System.out.println("Target is not present"
                               + " in the array");
        }
    }
}
Output: 
Target is not present in the array
Reference: https://guava.dev/releases/19.0/api/docs/com/google/common/primitives/Floats.html#lastIndexOf(float%5B%5D, %20float)
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