Question

JAVA write a completed program (must include MAIN) and straight to the output on Q1

e following exercises is a method to be added to the ArrayIntlist class from this chapter Each of the a method called lastIndexof that accepts an integer as a parameter and returns the index in the list of ce of that value, or -1 if the value is not found in the list. For example, if the list stores 1 the 40], then the last index of 18 is 6 and 18, 39, 7, 18, 39, the last index of 3 is-1.

Answer 1

public class ArrayIntList {
  public static int lastIndexOf(int arr[], int key){
    int res = -1;
    for(int i = 0;i<arr.length;i++){
      if(arr[i] == key){
        res = i;
      }
    }
    return res;
  }

  public static void main(String args[]){
    int arr1[] = {1,18,2,7,18,39,18,40};
    System.out.println(lastIndexOf(arr1, 18));
    System.out.println(lastIndexOf(arr1, 3));
  }
}

$\color{blue}\underline{Output:}$

6

-1

$\color{blue}Please\; up\;vote\;the \;solution \;if \;it \;helped.\;Thanks!$