3- Anonymous Inner Classes
Jun 26, 2026 22:49
· 1:23
· English
· Whisper Turbo
· 2 ໄມໂຄຣໂຟນ
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Speaker 1 (3- Anonymous Inner Classes)
So in the last video we passed a new instance of our console printer
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Speaker 1 (3- Anonymous Inner Classes)
class to a Greek method As I told you sometimes we don't want to explicitly
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Speaker 1 (3- Anonymous Inner Classes)
create a class to implement an interface Perhaps we want to implement an
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Speaker 1 (3- Anonymous Inner Classes)
interface only once and use it for a single purpose We don't want to reuse
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Speaker 1 (3- Anonymous Inner Classes)
that class.
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Speaker 1 (3- Anonymous Inner Classes)
So that's where we use anonymous inner classes So
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Speaker 1 (3- Anonymous Inner Classes)
instead of creating a new instance of the console printer class here
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Speaker 1 (3- Anonymous Inner Classes)
we can type new
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Speaker 2 (3- Anonymous Inner Classes)
printer.
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Speaker 1 (3- Anonymous Inner Classes)
So we type the name of the interface and press enter.
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Speaker 1 (3- Anonymous Inner Classes)
What we have here is called an anonymous inner
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class.
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Speaker 1 (3- Anonymous Inner Classes)
It's anonymous because this class doesn't have a name.
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Speaker 1 (3- Anonymous Inner Classes)
It's just an implementation and we call it an inner class because we're
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Speaker 1 (3- Anonymous Inner Classes)
using this inside a method.
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Speaker 1 (3- Anonymous Inner Classes)
Okay, so in this class we're
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Speaker 1 (3- Anonymous Inner Classes)
implementing the print method.
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Speaker 1 (3- Anonymous Inner Classes)
Here we can use a print statement to print this
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Speaker 1 (3- Anonymous Inner Classes)
message.
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Speaker 1 (3- Anonymous Inner Classes)
Now when we run this program
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Speaker 1 (3- Anonymous Inner Classes)
we get the exact same result.
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Speaker 1 (3- Anonymous Inner Classes)
So this is how we can use an anonymous inner class.
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Speaker 1 (3- Anonymous Inner Classes)
With anonymous inner classes,
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Speaker 1 (3- Anonymous Inner Classes)
we can achieve the same result by writing less code.
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Speaker 1 (3- Anonymous Inner Classes)
But Java 8 introduced a better and more concise way to achieve
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Speaker 1 (3- Anonymous Inner Classes)
the same result.
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Speaker 1 (3- Anonymous Inner Classes)
That's called a lambda expression and we're going to look at that next.
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