13- Summary

Jun 20, 2026 07:36 · 0:55 · English · Whisper Turbo · 2 Wasemaji
Rekodi hiyo yamalizika leo. Kufugwa kwa ajili ya uhifadhi wa kudumu →
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Kuonyesha tu
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Let's quickly recap what you learned in this section.
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With generics,
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we can create general purpose classes and methods that can work with different
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types of objects.
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Generics are very common in Java.
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As you will see throughout this course,
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a lot of built -in classes and interfaces in Java are generic.
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Now,
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when we compile a generic class,
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the Java compiler will erase the generic type parameter and replace
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it with an actual class.
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By default,
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it will use the object class unless we apply a constraint to a parameter.
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We can apply a constraint using the extents keyword and this will ensure that we can
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only use the given type or its subtypes as a generic type argument.
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We also talked about wildcards.
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With wildcards we can cast generic types.
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So that's it.
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In the next section I'm going to talk about collections and as you will see these collection
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types are all generic.
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So I'll see you in the next section.

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