Java int's lastIndexOf Function

The lastIndexOf() method of the Ints class returns the index of the last appearance of the value target in array. The syntax is as follows −

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

Here, arr is the array of int values, whereas target is the int value for which we are finding the last index.

Let us first see an example −

Example

import com.google.common.primitives.Ints;
class Demo {
   public static void main(String[] args) {
      int[] myArr = { 10, 20, 30, 40, 50, 60,20, 80, 20, 100 };
      System.out.println(Ints.join("-", myArr));
      // finding last index of element 20
      int index = Ints.lastIndexOf(myArr, 20);
      if (index != -1) {
         System.out.println("The last index of element 20 = " + index);
      } else {
         System.out.println("The element 20 is not in the array.");
      }
   }
}

Output

10-20-30-40-50-60-20-80-20-100
The last index of element 20 = 8