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Adding More Methods

5:10 with James Churchill

In this video, we'll review the solution to the first challenge and introduce our second challenge—adding two more methods to our media type class.

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2nd Challenge

Add a method named Loan() that accepts a string of the name of the person who is borrowing the item.
- Store the person's name in a new field named Loanee.
- Use a boolean field, OnLoan, to indicate whether or not an item has been loaned out.
Add a method named Return() that resets the loan related fields to their default values.
- null for the Loanee field and false for the OnLoan field.
Update the GetDisplayText() method to include the loan related fields if the item is on loan.
- For example, if an album is currently on loan, it should display the text "Album: Yellow Submarine by The Beatles (Currently on loan to Joe Smith)".
Test your changes by updating the Program.cs file Main() method to call the Loan() and Return() methods.

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If you get stuck on any of the following topics or simply need a refresher, click on a topic in list below to view the associated video in the C# Objects course.

Recall that the void keyword can be used to indicate that a method won't return a value

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Welcome back. 0:00

How did you do? 0:01

Don't worry if you weren't able to complete every part of the challenge, 0:02

it's normal to struggle when you're learning something new. 0:06

Let's walk through my solution. 0:09

In the Album.cs file, I added a method to the Album class. 0:10

Remember that a methods return type is the data type of the value that will be 0:16

returned from the method. 0:20

So I use string for the method's return type, 0:21

then I name my method GetDisplayText. 0:26

After the method name, I added a pair of parentheses. 0:29

If this method needed parameters I'd define them here between the parentheses. 0:33

But this method won't define any parameters. 0:37

So I'll leave this part as it is. 0:40

Then I added a set of curly braces to define the code block for my method body. 0:43

In order for the method to be accessible from the program.cs file main method, 0:48

we need to include the public access modifier right before the return type. 0:53

To return a string value from our method, 1:00

we use the return keyword followed by a string value. 1:02

For my string value, 1:08

I'll use string concatenation to combine string literals and field values. 1:09

I'll do the same thing that I was doing in the program.cs main method. 1:14

So Album: " + Title. 1:18

Then another string literal contain the word by, then the artist field value. 1:25

Cmd+S or Ctrl+S to save the file and open program.cs. 1:32

Here, I did a little bit of clean up and 1:39

removed all of the code that didn't pertain to the album media type 1:41

since that's the one media type that we're working with in this practice session. 1:44

I also renamed the album variable to album 1. 1:53

And added two more album class instances. 1:59

var album2 = new Album. 2:03

And for the title, how about The Wall? 2:07

And for the artist, Pink Floyd? 2:10

Then var album3. 2:15

New album. 2:18

How about Pet Sounds by The Beach Boys. 2:21

And to write each album's media type information to the console, 2:29

I passed a call to the album classes, 2:33

get display text method into the console right line method call. 2:35

First, album1. 2:43

So, album1.GetDisplayText then 2:45

repeat that for album2 and album3. 2:50

And finally, I compiled and ran the program. 2:58

Ncs star.cs, in order to include all the cs files 3:04

in our project, then -out colon Program.exe, 3:09

in order to name the exe file then let's also run the program. 3:14

&& space mono program.exe. 3:20

And here is the output for all three of my album media types. 3:27

Are you ready for the second challenge? 3:31

When thinking about the behaviors that I wanted my media types to support, 3:33

I remembered that sometimes I let family members and 3:37

friends borrow items from my media library. 3:39

So I thought it'd be helpful to add two methods, loan and return, that can 3:42

be used to track when an item is loaned out to someone and when it's returned. 3:48

The loan method should accept a string of the name of the person who is borrowing 3:54

the item and store the person's name in a new field named, Loanee. 3:58

Use a boolean field, OnLoan, to indicate whether or 4:03

not an item has been loaned out. 4:06

The return method should reset the loan-related 4:09

fields to their default values. 4:12

Null for the Loanee field and False for the OnLoan field. 4:14

Unlike the getDisplayText method, neither of these methods, loan or 4:18

return, will return a value. 4:22

Speaking of the getDisplayText method, 4:25

update it to include the loan related field items if the item is out on loan. 4:28

For example, if an album is currently on loan, it should display the text 4:33

Album:Yellow Submarine by the Beatles, and then in parentheses, 4:37

Currently on loan to Joe Smith, the name of the person who borrowed it. 4:42

And lastly, to test your changes, update the program.cs file to call the loan and 4:47

return methods. 4:52

Be sure to use the get display text method to write the media type information to 4:54

the console after calling the loan and return methods. 4:58

They'll help you to determine if the new methods are working properly. 5:02

And that's the second challenge. 5:05

After the break, I'll show you my solution. 5:08

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