7- Built-in Functional Interfaces

Jun 29, 2026 19:08 · 1:42 · English · Whisper Turbo · 2 Locutores

Haec pagina de translatio explicat. Despectus in Viam Permanentem →

Index communium praefecturae Leptis Magnae

0:03

S… Speaker 2 (7- Built-in Functional Interfaces)

Java provides many predefined functional interfaces that we can use to perform

0:08

S… Speaker 2 (7- Built-in Functional Interfaces)

common tasks.

0:09

S… Speaker 2 (7- Built-in Functional Interfaces)

These interfaces are declared in this package.

0:11

S… Speaker 2 (7- Built-in Functional Interfaces)

Java that you tell that function.

0:13

S… Speaker 2 (7- Built-in Functional Interfaces)

So as you can see we have quite a few interfaces here that

0:17

S… Speaker 2 (7- Built-in Functional Interfaces)

we can use to perform common tasks.

0:19

S… Speaker 2 (7- Built-in Functional Interfaces)

Now the list may appear overwhelming but trust me this is actually easier

0:23

S… Speaker 1 (7- Built-in Functional Interfaces)

than you think.

0:24

S… Speaker 2 (7- Built-in Functional Interfaces)

You basically have four types of functional interfaces in Java.

0:28

S… Speaker 2 (7- Built-in Functional Interfaces)

We have consumers,

0:29

S… Speaker 2 (7- Built-in Functional Interfaces)

suppliers,

0:30

S… Speaker 2 (7- Built-in Functional Interfaces)

functions,

0:31

S… Speaker 2 (7- Built-in Functional Interfaces)

and predicates.

0:32

S… Speaker 2 (7- Built-in Functional Interfaces)

All the interfaces you saw fall into these four categories.

0:35

S… Speaker 2 (7- Built-in Functional Interfaces)

First,

0:36

S… Speaker 2 (7- Built-in Functional Interfaces)

I'm going to give you a very brief explanation of each of these types,

0:39

S… Speaker 2 (7- Built-in Functional Interfaces)

and then over the next few videos,

0:41

S… Speaker 2 (7- Built-in Functional Interfaces)

we're going to study each of these in detail.

0:42

S… Speaker 2 (7- Built-in Functional Interfaces)

So the consumer interface represents an operation that takes

0:47

S… Speaker 2 (7- Built-in Functional Interfaces)

a single argument and returns no result.

0:49

S… Speaker 2 (7- Built-in Functional Interfaces)

That is why it's called consumer,

0:51

S… Speaker 2 (7- Built-in Functional Interfaces)

because it consumes a value.

0:53

S… Speaker 1 (7- Built-in Functional Interfaces)

For example,

0:54

S… Speaker 2 (7- Built-in Functional Interfaces)

this printer interface that we declared,

0:56

S… Speaker 2 (7- Built-in Functional Interfaces)

this is very similar to the consumer interface in Java because

1:00

S… Speaker 2 (7- Built-in Functional Interfaces)

this print method simply consumes this message.

1:03

S… Speaker 2 (7- Built-in Functional Interfaces)

It takes a single argument and doesn't return a value.

1:06

S… Speaker 2 (7- Built-in Functional Interfaces)

The supplier interface is the opposite of the consumer interface.

1:10

S… Speaker 2 (7- Built-in Functional Interfaces)

It represents an operation that takes no input and returns a value.

1:14

S… Speaker 2 (7- Built-in Functional Interfaces)

So it supplies a value.

1:16

S… Speaker 2 (7- Built-in Functional Interfaces)

The function interface represents a function that can map a value to a different value.

1:20

S… Speaker 2 (7- Built-in Functional Interfaces)

And the predicate interface represents an operation that takes an object and

1:25

S… Speaker 2 (7- Built-in Functional Interfaces)

checks to see if that object satisfies some criteria.

1:28

S… Speaker 2 (7- Built-in Functional Interfaces)

We use this in filtering data.

1:30

S… Speaker 1 (7- Built-in Functional Interfaces)

For example,

1:31

S… Speaker 2 (7- Built-in Functional Interfaces)

with the predicate interface,

1:32

S… Speaker 2 (7- Built-in Functional Interfaces)

we can get the customers who don't have a phone number or courses that

1:36

S… Speaker 2 (7- Built-in Functional Interfaces)

are older than two years.

1:37

S… Speaker 1 (7- Built-in Functional Interfaces)

Next,

1:38

S… Speaker 2 (7- Built-in Functional Interfaces)

we're going to look at the consumer interface.

Haec transcriptio a AI (recognitione automatica loci) generata est. Errores continere potest - contra audio originalem verificare ut criticum utentur. Politicae

❤️ STT.ai amoris?

Summa

Haec pagina de scriptura explicat, quae ad scripturam translativam pertinet.

De hoc translatio scripsit.

Quod ad hoc adscriptum est, quod ad hoc adscriptum est, et adscriptum est.

Translatio