Problem 2 [20pt] Consider the following Java code: public class BankAccount { public double balance; public...
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Problem 2 [20pt] Consider the following Java code: public class BankAccount { public double balance; public BankAccount () ( balance = 0.0; } public void withdraw (double amount) { balance -= amount; public void deposit (double amount) { balance += amount; } Since this is a checking account, you are required to enforce an invariant that the balance is never negative. With this invariant in mind, a) (5pt) Explain why the given code is a bad design for the abstract data type BankAccount. b) (15pt) Write down a better implementation for BankAccount in Java (or your favorite 00 language). For each method in your implementation, clearly specify precondition, postcondition and side effects in comments, as we did in Lecture 31. Problem 2 [20pt] Consider the following Java code: public class BankAccount { public double balance; public BankAccount () ( balance = 0.0; } public void withdraw (double amount) { balance -= amount; public void deposit (double amount) { balance += amount; } Since this is a checking account, you are required to enforce an invariant that the balance is never negative. With this invariant in mind, a) (5pt) Explain why the given code is a bad design for the abstract data type BankAccount. b) (15pt) Write down a better implementation for BankAccount in Java (or your favorite 00 language). For each method in your implementation, clearly specify precondition, postcondition and side effects in comments, as we did in Lecture 31.
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Related Book For
Financial Markets and Institutions
ISBN: 978-0077861667
6th edition
Authors: Anthony Saunders , Marcia Cornett
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