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Welcome back.

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In this chapter, we are going to look at the codling fundamentals, part three, so to speak.

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So we are going to start with a retests, then we're going to look at lumber expression's.

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Then we're going to see how the visibility modifiers work, because we have used them already quite

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a bit, but we haven't really looked into them, so we haven't really touched them too much.

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And that's what we will look at.

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And this chapter then we are also going to see how to use nested and inner classes because we've seen

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our classes work and how object oriented programming works.

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But there is a thing called nested in inner class and we're going to see how to use that.

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Then we're going to see how to use the safe and unsafe cast operator.

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And then finally, we're going to look into exception handling.

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So what should happen if we get an error or what can we do in order to catch the error and not make

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our application suffer by that error?

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All right.

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So often it really depends on what kind of error we have, but many errors.

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We can just catch them.

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We can just do something else or we can just not do anything.

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And, well, at least not crash the application, even though the application might not exactly do what

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we wanted it to do.

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But at least it's not going to be suffering in terms of crashing.

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And when that happens and the user has your application and crashes, you might accept that one, but

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he's not going to accept it multiple times.

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So that's why it's super important to look into that topic as well.

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OK, so let's get started with this chapter in the next video.

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So see you there.