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Will be polymorphism as the word goes.

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We have poly and Marth.

3
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So let's add the so we have poly in in many and we have more.

4
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Which means smooth change, polymorphism and pattern can be implemented using an interface, and the

5
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interface is some sort of method which can take many different forms which actually change depending

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on the input.

7
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So yeah, we could define this with the Founders interface, which permits us obtain the area of the

8
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given smiley.

9
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So we have area interface.

10
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It takes in the object and then it returns that object, the head area.

11
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There we go.

12
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Now we've defined as interface.

13
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Let's look at itself.

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Below we define let's define this tool.

15
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So firstly, we have happy and then we have some signs of type smiley and happy of type square smiley.

16
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So right, yeah, we could have area interface and then we pass in happy.

17
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So let's run this on that and there we go.

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We see that was iPad's in happy.

19
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We have its area.

20
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We could also pass in Happy and then modify this and say, okay, we want a side value of C 21 that

21
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we have not area we could pass inside and then pass in a radius of say, let's see, seven and then

22
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we have this area interface which takes different forms depending on what we pass in what kind of object

23
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we pass in.

24
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Yeah, we have set, we run that.

25
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Let's put in some prints here.

26
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You have prints.

27
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Prints.

28
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Then we go, let's put in one year as you give us the apple one for that gorgeous pie square.

29
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So that's fine.

30
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So we're going to have whatever value here and we have its area.

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So this interface now permits us to use the same piece of code to obtain the area for two different

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objects.

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And this helps us easily modify code and also maintain it.