Answered: the following piece of code. (The…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Consider 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);
13         r2 = new intRef(20);
14         r1.val++;
15         r2.val++;
16         System.out.print(r1.val + "" + r2.val);
17     }
18 }

which answers are correct?

(More than one of the statements could be true. )

A. The output of the program will be 12121321

B.Statements on lines 11 and 15 increment the member variable val of the same instance/object

C.r1 and r2 of line 16 refer to different instances/objects

D.Line 11 of the code increments the member variable val of the instance/object referenced by r1

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