Ints lastIndexOf() function | Guava

Ints lastIndexOf() function | Guava | Java

Last Updated : 15 Nov, 2018

Guava’s Ints.lastIndexOf() returns the index of the last appearance of the value target in array.

Syntax:

public static int 
  lastIndexOf(int[] array, int target)

Parameters:

array: An array of int values, possibly empty.
target: A primitive int value.

Return Value: The Ints.indexOf() method returns the greatest index i for which array[i] == target, or -1 if no such index exists.

Example 1:

// Java code to show implementation of 
// Guava's Ints.lastIndexOf() method 
  
import com.google.common.primitives.Ints; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an integer array 
        int[] arr = { 1, 2, 3, 4, 3, 5, 3, 4 }; 
  
        int target = 3; 
  
        // Using Ints.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 = Ints.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 Ints.lastIndexOf() method 
  
import com.google.common.primitives.Ints; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an integer array 
        int[] arr = { 3, 5, 7, 11, 13 }; 
  
        int target = 17; 
  
        // Using Ints.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 = Ints.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://google.github.io/guava/releases/22.0/api/docs/com/google/common/primitives/Ints.html#lastIndexOf-int:A-int-

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