(The Time class) Design a class named Time. The class...

(The Time class) Design a class named Time. The class contains: ? The private data fields hour, minute, and second that represent a time. ? A constructor that constructs a Time object that initializes hour, minute, and second using the current time. ? The get methods for the data fields hour, minute, and second, respectively. ? A method named setTime(elapseTime) that sets a new time for the object using the elapsed time in seconds. For example, if the elapsed time is 555550 seconds, the hour is 10, the minute is 19, and the second is 12. Draw the UML diagram for the class, and then implement the class. Write a test program that creates a Time object and displays its hour, minute, and second. Your program then prompts the user to enter an elapsed time, sets its elapsed time in the Time object, and displays its hour, minute, and second. Here is a sample run: Current time is 12:41:6 Enter the elapsed time: 55550505 The hour:minute:second for the elapsed time is 22:41:45

(The Time class) Design a class named Time. The class contains:
? The private data fields hour, minute, and second that represent a time.
? A constructor that constructs a Time object that initializes hour, minute, and second using the current time.
? The get methods for the data fields hour, minute, and second, respectively.
? A method named setTime(elapseTime) that sets a new time for the object
using the elapsed time in seconds. For example, if the elapsed time is 555550
seconds, the hour is 10, the minute is 19, and the second is 12.
Draw the UML diagram for the class, and then implement the class. Write a test program that creates a Time object and displays its hour, minute, and second. Your program then prompts the user to enter an elapsed time, sets its elapsed time in the Time object, and displays its hour, minute, and second. Here is a sample run:
Current time is 12:41:6
Enter the elapsed time: 55550505
The hour:minute:second for the elapsed time is 22:41:45

Key Concepts

Method Implementation

Method implementation involves defining the behavior of a class through functions that operate on its data fields. This includes getter methods to retrieve the state of an object and specialized methods, such as setTime, that perform operations like updating the object's state based on given input. The method design should consider input validation and proper data handling.

Constructors

Constructors are special methods used to initialize new objects of a class. They set the initial state of an object by assigning values to its attributes. In the context of the question, the constructor is used to initialize the time fields based on the current time, ensuring that each Time object starts with a defined state.

Time Conversion

Time conversion refers to the process of converting a total number of seconds into hours, minutes, and seconds. This is achieved by dividing and taking remainders sequentially by 3600 (to get hours), 60 (to get minutes), and then seconds. Understanding this conversion process is key to accurately representing elapsed time in a human-readable format.

UML Diagram

A UML (Unified Modeling Language) diagram is a visual representation used to describe the structure and design of a system. In the context of class design, a UML diagram illustrates the class name, its attributes (fields), and its operations (methods), along with their visibility, helping developers to understand and communicate the design structure effectively.

Object-Oriented Programming

Object-oriented programming (OOP) is a programming paradigm that uses 'objects' to design applications and programs. In OOP, a class serves as a blueprint for creating objects with specific attributes and behaviors, which promotes encapsulation, modularity, and reusability of code.

Encapsulation

Encapsulation is a fundamental concept in object-oriented programming that restricts direct access to an object's internal data and methods. By using access modifiers such as private for data fields, a class can control how its internal state is accessed and modified, thereby ensuring data integrity and promoting a clear separation of concerns.

Transcript

00:01 Okay, good day, ladies and gentlemen.

00:06 We are looking alive at problem number 710.

00:12 And it is a bit of a doozy, i'm afraid.

00:17 It really is a bit of a doozy.

00:19 It's a time class problem.

00:23 And so it's, i mean, it sort of, you know, basically, it's based off one of the problems earlier in the class.

00:36 It would have been, like, two points.

00:40 He says it's from listing 2 .7.

00:45 But, okay.

00:47 So what we're supposed to do is we're supposed to create this time class, which has two private data fields or three private data fields.

01:01 It constructs a time which initializes the hour, minutes, and second using the current time, and then corresponding get methods for the private data fields, and then it creates this method set time of elapsed time that creates a new time based off the elapsed time.

01:29 Okay.

01:31 So with all of that being said or sort of said, let's begin with the, so i've actually, okay, i'm just going to admit, i've already pre -done it.

01:44 I've already done it already because this is a bit frustrating, i think, to be honest with you.

01:52 So basically, i've already done it.

01:54 And i just want to sort of talk you through what i've done.

01:54 So the first thing, i'm a bit frustrating.

01:54 So basically, i've already done it.

01:55 And i just want to sort of talk you through what i've done.

01:58 So the first, first thing you want to do is just import time because that's what we're going to be using.

02:04 So we're going to be using the time module to initialize the times.

02:13 And my class is called time.

02:17 Now variables are private, but i'm initializing them from the module.

02:29 So the time.

02:33 Time method will set a certain number of seconds, and then i take the integer value.

02:41 And all of this theory is explained in the book, so i'm not going to try to get too deep into it, because really i just used exactly the calculations he did in 2 .7.

02:56 So, you know, i took the total minutes to be the, you know, you divided by 60 and then take the lower part, the lower and the total hours again to be the total minutes divided by 60.

03:16 And then because i want to set this to the current one, i just mod it by 60 here or you modular wrist.

03:28 Arithmetic and modular arithmetic on the, again, these are private variables here.

03:35 And i decided to sort of introduce these intermediary variables just because i think it's a little cleaner, but, you know, that's up to you.

03:45 These intermediary variables up here, these total seconds, and then i just used them here because i think it's a little cleaner to do it this way, but there's no, i don't think you have to.

03:58 I just do it that way.

04:01 Okay, once i've gotten the variables or the private variable set, then i go down here and these are the assessor methods.

04:14 So just to, you can print them out, you know, the values.

04:21 You can print them out as we will shortly.

04:25 And then here, down here finally, this set time method, which is a bit of a bit annoying, i think, and i'm not even exactly certain.

04:44 Anyhow, so i just calculated the corresponding values.

04:50 And then i did the test.

04:54 So the test, oops, wrong one here.

04:58 Oops, again, can't do the right thing here.

05:02 And then the test module, so in the test, now i'm just importing time.

05:09 So i'm from time class, that's what i called that file.

05:15 I import time...