Program to sum the Inputted Number with Previous Sum

This program sums a list of numbers entered by the user. It converts the string representation of each number into an int using parseInt().

import java.io.*;

class ParseDemo {
  public static void main(String args[]) 
    throws IOException
  {
    // create a BufferedReader using System.in
    BufferedReader br = new
      BufferedReader(new InputStreamReader(System.in));
    String str;
    int i;
    int sum=0;
    
    System.out.println("Enter numbers, 0 to quit.");
    do {
      str = br.readLine();
      try {
        i = Integer.parseInt(str);
      } catch(NumberFormatException e) {
        System.out.println("Invalid format");
        i = 0;
      }
      sum += i;
      System.out.println("Current sum is: " + sum);
    } while(i != 0);
  }
}

Output of Above Java Program
Enter numbers, 0 to quit.
1
Current sum is: 1
2
Current sum is: 3
4
Current sum is: 7
5
Current sum is: 12
8
Current sum is: 20
0
Current sum is: 20