Find consecutive duplicate numbers in a series of numbers seperated by commas

Question:

Find consecutive duplicate numbers in a series of numbers seperated by commas?

Code:

import java.util.Scanner;
 
public class DuplicateNumbers {
 
  public static void main(String[] args) {
 
    Scanner sc = new Scanner(System.in);
 
    // Example: 1,2,3,4,3,2,1
    System.out.print("Enter numbers: ");
    String str = sc.nextLine();
 
    // splitting a comma separated string
    String[] numbers = str.split(",");
 
    Integer last = null;
    Integer current = null;
    int total = 0;
 
    for (String number: numbers) {
 
      current = Integer.parseInt(number);
 
      // if last is null then this is the first number
      if (last != null) {
        if(last == current){
          System.out.println("Duplicates: " + current);
          total = total +1;
        }
      }
      last = current;
 
    }
    System.out.println("Total duplicates: " + total);
  }
}

Output:

$ java DuplicateNumbers
Enter numbers: 1,2,5,5,7,8,8,4,4,3,2,1
Duplicates: 5
Duplicates: 8
Duplicates: 4
Total duplicates: 3