1
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And this solution or inequality, quality control, the contact class, if the color misuses, the methods

2
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are constructor's, we're going to throw an unchecked exception, which is going to force them to fix

3
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their code.

4
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We'll start with the constructor, the caller should not be allowed to pass on a name that is null or

5
00:00:16,260 --> 00:00:18,600
blank, so if the name is null.

6
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Our name is Blank.

7
00:00:26,250 --> 00:00:28,770
Then we'll throw a new illegal argument exception.

8
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Name cannot be null or a blank.

9
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We'll do the same thing for the phone number.

10
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If the phone number is null.

11
00:00:48,770 --> 00:00:49,520
Or blank.

12
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We'll throw in a legal argument exception.

13
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The phone number also can't be less than five characters, so we'll check if the phone number at length.

14
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Is less than five.

15
00:01:18,500 --> 00:01:19,790
We'll throw another exception.

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Ken, how should we throw an illegal argument, exception of birth date is another blank.

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00:01:43,140 --> 00:01:48,540
You can if you want, I would say it's not necessary simply because the constructor already throws a

18
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check the exception, if the birthdate isn't passable.

19
00:01:54,890 --> 00:01:59,660
Now we need to quality control our methods, starting with set name, the colour should not be allowed

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to update an object with a name that is another blank.

21
00:02:03,080 --> 00:02:06,080
So if the name that was passed in is null or blank.

22
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You'll throw an exception.

23
00:02:20,860 --> 00:02:25,960
Same thing for the phone number, we'll throw an exception if they enter a number that is null or blank.

24
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We'll throw another one if the length of the phone number they pass down is less than five characters.

25
00:02:59,660 --> 00:03:02,030
In which case, we'll throw a new exception.

26
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Phone number cannot be less than five characters.

27
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And inside birthday, there's nothing to really do because if the color were to pass in an invalid birth

28
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date, the method would throw a pass exception.

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Now you can feel free to test the exceptions by passing in wrongful values, just like we did in the

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vending machine app.

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But I'm going to wrap it up right here and move on to part four.