Explain why the following program prints different totals for the given array. Rewrite it so that this does not happen.

class ShowInterf { public static void main(String args[]) { int[] b = { 23, 45, 33, 13, 28, 45, 34, 54, 67 }; (new Thread(new Summer(b))).start(); (new Thread(new Swapper(b))).start(); } } class Swapper implements Runnable { int b[]; public Swapper(int k[]) { b = k; } public void run() { int j, k, t; while (true) { j = (int)(Math.random() * b.length); k = (int)(Math.random() * b.length); t = b[j]; b[j] = b[k]; b[k] = t; } } class Summer implements Runnable { int b[]; public Summer(int k[]) { b = k; } public void run() { while (true) { int total = 0; for (int i = 0; i < b.length; i++) total += b[i]; System.out.println(total); } } }

Update: This is the full question that was provided. Further basic knowledge is not known.