the following piece of code. (The numbers on the left margin denote line numbers.) line# 01 public class intRef { 02     int val; 03     public intRef (int n) { 04         val = n; 05     } 06     public static void main (String [ ] argv) { 07         intRef r1, r2; 08         r1 = new intRef(10); 09         r2 = r1; 10         r1.val++; 11         r2.val++; 12         System.out.print(r1.val + "" + r2.val);

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