Question

Refer to the following Date class declaration: A method in a client program for the Date class has this declaration:Date $\mathrm{d} 1=$ new Date $(\mathrm{mo}, \mathrm{da}, \mathrm{yr})$.where mo, da, and yr are previously defined integer variables. The same method now creates a second Date object d2 that is an exact copy of the object d1 refers to. Which of the following code segments will not do this correctly?I Date $\mathrm{d} 2=\mathrm{d} 1$ II Date $\mathrm{d} 2=$ new Date $(\mathrm{mo}, \mathrm{da}, \mathrm{yr})$; III Date $\mathrm{d} 2=$ new Date $(\mathrm{d} 1 . \text { month }(), \mathrm{d}; 1 . \text { day }(), \text { d1. year }())$; (A) I only (B) II only (C) III only (D) II and III only (E) I, II, and III

Name: Problem 10, Chapter 2: Barron's AP Computer Science A
Uploaded: 2023-03-23T23:44:39-08:00
Duration: 3 min 9 s
Channel: Samriddhi Singh

   Refer to the following Date class declaration:
A method in a client program for the Date class has this declaration:Date $\mathrm{d} 1=$ new Date $(\mathrm{mo}, \mathrm{da}, \mathrm{yr})$.where mo, da, and yr are previously defined integer variables. The same method now creates a second Date object d2 that is an exact copy of the object d1 refers to. Which of the following code segments will not do this correctly?I Date $\mathrm{d} 2=\mathrm{d} 1$
II Date $\mathrm{d} 2=$ new Date $(\mathrm{mo}, \mathrm{da}, \mathrm{yr})$;
III Date $\mathrm{d} 2=$ new Date $(\mathrm{d} 1 . \text { month }(), \mathrm{d}; 1 . \text { day }(), \text { d1. year }())$;
(A) I only
(B) II only
(C) III only
(D) II and III only
(E) I, II, and III

Barron's AP Computer Science A

Roselyn Teukolsky 7th Edition

Chapter 2, Problem 10

Instant Answer

Solved by Expert Samriddhi Singh

03/23/2023

Step 1

The first object is created as Date d1 = new Date(mo, da, yr), where mo, da, and yr are previously defined integer variables. Show more…

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Refer to the following Date class declaration: A method in a client program for the Date class has this declaration:Date $\mathrm{d} 1=$ new Date $(\mathrm{mo}, \mathrm{da}, \mathrm{yr})$.where mo, da, and yr are previously defined integer variables. The same method now creates a second Date object d2 that is an exact copy of the object d1 refers to. Which of the following code segments will not do this correctly?I Date $\mathrm{d} 2=\mathrm{d} 1$ II Date $\mathrm{d} 2=$ new Date $(\mathrm{mo}, \mathrm{da}, \mathrm{yr})$; III Date $\mathrm{d} 2=$ new Date $(\mathrm{d} 1 . \text { month }(), \mathrm{d}; 1 . \text { day }(), \text { d1. year }())$; (A) I only (B) II only (C) III only (D) II and III only (E) I, II, and III

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Key Concepts

Object References and Aliasing

In object-oriented programming, assigning one object variable to another (for example, d2 = d1) merely copies the reference to the existing object rather than creating a new, independent instance. This means both variables now point to the same memory location, and changes made through one reference will affect the other, which is often not the desired behavior when an independent copy is required.

Copying Objects

Creating an independent copy of an object requires constructing a new object with the same state as the original. This can be achieved through techniques such as using a copy constructor or by retrieving the object's attributes via accessor methods and passing them to another constructor. This approach ensures that the new object is separate from the original and modifications to one do not reflect in the other.

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