Create Index of an extra element

Index of an extra element

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+//Index of an extra element
+
+import java.util.*;
+
+class ExtraElement {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int t = sc.nextInt();
+
+        while(t-- > 0) {
+            int n = sc.nextInt();
+            int[] a = new int[n];
+            int[] b = new int[n - 1];
+
+            for(int i = 0; i < n; i++)
+              a[i] = sc.nextInt();
+
+            for(int i = 0; i < n - 1; i++)
+              b[i] = sc.nextInt();
+
+            Solution g = new Solution();
+            System.out.println(g.findExtra(n, a, b));
+        }
+    }
+}
+
+class Solution {
+    public int findExtra(int n, int arr1[], int arr2[]) {
+        for(int i = 0; i < n - 1; i++) {
+            if(arr1[i] != arr2[i]) {
+                return i;
+            }
+        }
+
+        return n - 1;
+    }
+}