Java Guava | Floats.lastIndexOf() method with Examples

Last Updated : 31 Jan, 2019

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 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 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"); 
        } 
    } 
} 