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And this solution, we're going to quality control the movie class, starting with the constructor,

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the caller should not be allowed to pass a name that is Neller Blank.

3
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So if the name is null.

4
00:00:12,180 --> 00:00:13,110
Or as blank.

5
00:00:16,400 --> 00:00:19,250
We're going to throw a new illegal argument exception.

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Name must contain a value.

7
00:00:32,420 --> 00:00:38,330
We also need to check if the format doesn't equal DVD or Blu ray, so our condition is going to check

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if format equals DVD.

9
00:00:42,480 --> 00:00:43,890
Or if it equals the Blu ray.

10
00:00:49,400 --> 00:00:53,660
Then we'll reverse it so that it checks if it doesn't equal DVD or Blu ray.

11
00:00:55,870 --> 00:00:57,700
In which case, we're going to throw a new.

12
00:01:00,380 --> 00:01:02,090
A legal argument, exception.

13
00:01:04,720 --> 00:01:08,230
Telling the caller format must be DVD or Blu ray.

14
00:01:14,670 --> 00:01:20,730
Also, ratings can only go from zero to 10, so we can't allow the color to pass in a negative rating

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or one that exceeds 10.

16
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So if rating is smaller than zero.

17
00:01:27,810 --> 00:01:29,550
Or if it's bigger than 10.

18
00:01:33,560 --> 00:01:37,580
We're going to throw a new illegal argument exception.

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00:01:41,240 --> 00:01:42,380
Invalid rating.

20
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OK, now we need to quality control our methods, starting with name, the colour should not be allowed

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to update an object with a name that is blank.

22
00:01:57,790 --> 00:01:59,620
So if name is equal to null.

23
00:02:00,880 --> 00:02:01,930
Or if it's blank.

24
00:02:05,090 --> 00:02:05,900
Through a new.

25
00:02:09,050 --> 00:02:10,910
A legal argument, exception.

26
00:02:19,760 --> 00:02:25,610
Inside format will throw an exception of the format they passed isn't DVD or isn't Blu ray?

27
00:03:05,660 --> 00:03:09,440
And inside rating, we're going to check if the rating is less than zero.

28
00:03:12,950 --> 00:03:14,000
Or higher than 10.

29
00:03:17,400 --> 00:03:20,940
In which case, we need to throw another illegal argument, exception.

30
00:03:28,000 --> 00:03:33,160
And that's all for quality control, these methods and constructor are going to forbid the caller from

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misusing them.