7.10 Now consider another potential subtype of Counter, Counter3, with the following extra operations: public Counter3 (int n) / EFFECTS: makes this contain n public void incr (int n) / MODIFIES: this / EFFECTS: If n > 0 adds n to this. Is Counter3 a legitimate subtype of Counter? Explain by arguing that either the substitution principle is violated (for a non-subtype) or that it holds (for a subtype). Discuss how each operation of Counter3 either upholds or violates the substitution principle.

7.10 Now consider another potential subtype of Counter, Counter3, with the following extra operations: public Counter3 (int n) / EFFECTS: makes this contain n public void incr (int n) / MODIFIES: this / EFFECTS: If n > 0 adds n to this. Is Counter3 a legitimate subtype of Counter? Explain by arguing that either the substitution principle is violated (for a non-subtype) or that it holds (for a subtype). Discuss how each operation of Counter3 either upholds or violates the substitution principle.

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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