13- Summary
Jun 20, 2026 07:36
· 0:55
· English
· Whisper Turbo
· 2 Cynhadledd
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Speaker 1 (13- Summary)
Let's quickly recap what you learned in this section.
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Speaker 1 (13- Summary)
With generics,
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Speaker 1 (13- Summary)
we can create general purpose classes and methods that can work with different
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Speaker 1 (13- Summary)
types of objects.
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Speaker 1 (13- Summary)
Generics are very common in Java.
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Speaker 1 (13- Summary)
As you will see throughout this course,
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Speaker 1 (13- Summary)
a lot of built -in classes and interfaces in Java are generic.
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Speaker 2 (13- Summary)
Now,
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Speaker 1 (13- Summary)
when we compile a generic class,
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Speaker 1 (13- Summary)
the Java compiler will erase the generic type parameter and replace
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Speaker 1 (13- Summary)
it with an actual class.
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Speaker 2 (13- Summary)
By default,
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Speaker 1 (13- Summary)
it will use the object class unless we apply a constraint to a parameter.
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Speaker 1 (13- Summary)
We can apply a constraint using the extents keyword and this will ensure that we can
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Speaker 1 (13- Summary)
only use the given type or its subtypes as a generic type argument.
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Speaker 1 (13- Summary)
We also talked about wildcards.
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Speaker 1 (13- Summary)
With wildcards we can cast generic types.
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Speaker 1 (13- Summary)
So that's it.
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Speaker 1 (13- Summary)
In the next section I'm going to talk about collections and as you will see these collection
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Speaker 1 (13- Summary)
types are all generic.
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Speaker 1 (13- Summary)
So I'll see you in the next section.
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