10- The Supplier Interface

Jun 29, 2026 19:29 · 2:30 · English · Whisper Turbo · 2 Ahotsak

Transkribapen honek gaur iraungitzen du. Biltegiratze iraunkorraren bertsio-berritzea →

Irakasgaiaren indizea

0:03

S… Speaker 2 (10- The Supplier Interface)

The supplier interface is the opposite of the consumer interface.

0:07

S… Speaker 2 (10- The Supplier Interface)

So instead of consuming a value,

0:09

S… Speaker 2 (10- The Supplier Interface)

it supplies a value.

0:10

S… Speaker 2 (10- The Supplier Interface)

So if you look at the documentation,

0:12

S… Speaker 2 (10- The Supplier Interface)

you can see here we have a single abstract method called get

0:16

S… Speaker 2 (10- The Supplier Interface)

which returns a value of type T.

0:18

S… Speaker 2 (10- The Supplier Interface)

So this interface is also a functional interface and we

0:23

S… Speaker 2 (10- The Supplier Interface)

can represent it using a lambda expression.

0:24

S… Speaker 2 (10- The Supplier Interface)

Let me show you.

0:25

S… Speaker 1 (10- The Supplier Interface)

So let's declare a supplier of double,

0:29

S… Speaker 2 (10- The Supplier Interface)

call it get random,

0:31

S… Speaker 2 (10- The Supplier Interface)

and set it to a lambda expression.

0:34

S… Speaker 2 (10- The Supplier Interface)

Now this lambda expression should match the signature of this method,

0:38

S… Speaker 2 (10- The Supplier Interface)

so it shouldn't have any parameters and it should return a value of type t,

0:42

S… Speaker 2 (10- The Supplier Interface)

in this case double.

0:43

S… Speaker 2 (10- The Supplier Interface)

So we type empty parenthesis because we don't have any parameters,

0:47

S… Speaker 2 (10- The Supplier Interface)

the lambda operator,

0:49

S… Speaker 2 (10- The Supplier Interface)

and then in the body of this lambda I'm going to return math .random

0:55

S… Speaker 2 (10- The Supplier Interface)

Now because we have a single statement and we're simply returning a value,

0:59

S… Speaker 2 (10- The Supplier Interface)

we can simplify this lambda expression.

1:01

S… Speaker 2 (10- The Supplier Interface)

That is why the return keyword is grayed out.

1:03

S… Speaker 2 (10- The Supplier Interface)

So we put the caret over here and press alt and enter to

1:08

S… Speaker 2 (10- The Supplier Interface)

replace this with a simpler lambda.

1:10

S… Speaker 1 (10- The Supplier Interface)

Take a look.

1:11

S… Speaker 2 (10- The Supplier Interface)

So empty parenthesis goes to math .random.

1:15

S… Speaker 2 (10- The Supplier Interface)

We don't need the curly braces,

1:17

S… Speaker 2 (10- The Supplier Interface)

we don't need the return keyword either.

1:19

S… Speaker 2 (10- The Supplier Interface)

Now, this lambda expression represents a function.

1:22

S… Speaker 2 (10- The Supplier Interface)

To call this function,

1:23

S… Speaker 2 (10- The Supplier Interface)

we should type get random dot get.

1:26

S… Speaker 2 (10- The Supplier Interface)

So this will return the random value,

1:30

S… Speaker 2 (10- The Supplier Interface)

and we can print it over here.

1:32

S… Speaker 1 (10- The Supplier Interface)

So every time we run this program,

1:36

S… Speaker 2 (10- The Supplier Interface)

we get a different value.

1:38

S… Speaker 1 (10- The Supplier Interface)

Now,

1:39

S… Speaker 2 (10- The Supplier Interface)

What you need to pay attention to here is that this function is not executed

1:43

S… Speaker 2 (10- The Supplier Interface)

until we explicitly call it.

1:46

S… Speaker 2 (10- The Supplier Interface)

This is called lazy evaluation.

1:48

S… Speaker 2 (10- The Supplier Interface)

So the value is not generated until we explicitly ask for

1:52

S… Speaker 1 (10- The Supplier Interface)

it.

1:52

S… Speaker 2 (10- The Supplier Interface)

Also, just like the consumer interface,

1:55

S… Speaker 2 (10- The Supplier Interface)

this supplier interface has a few specializations for working with

1:59

S… Speaker 2 (10- The Supplier Interface)

primitive values.

2:00

S… Speaker 2 (10- The Supplier Interface)

So we have double supplier,

2:02

S… Speaker 2 (10- The Supplier Interface)

we have int supplier,

2:04

S… Speaker 2 (10- The Supplier Interface)

we have long supplier and boolean supplier.

2:08

S… Speaker 2 (10- The Supplier Interface)

So if you're working with primitive values,

2:10

S… Speaker 2 (10- The Supplier Interface)

prefer to use this primitive specializations of the supplier interface because

2:15

S… Speaker 2 (10- The Supplier Interface)

you don't pay the cost of auto boxing the primitive value inside

2:19

S… Speaker 2 (10- The Supplier Interface)

a reference type and then

2:21

S… Speaker 2 (10- The Supplier Interface)

unboxing it later on.

2:22

S… Speaker 1 (10- The Supplier Interface)

So that's all about the supplier interface.

2:25

S… Speaker 2 (10- The Supplier Interface)

Next we're going to talk about the functional interface.

Transkriptu hau AI-k (hizketa-ezagutze automatikoak) sortu du. Erroreak izan ditzake - egiaztatu jatorrizko audioarekin, erabilpen kritikoa izan dadin. AI politika

❤️ Love STT.ai? Tell your friends!

Laburpena

Egin klik Laburpena botoian transkribapen honen AI laburpena sortzeko.

Galdetu AI-ri transkribapen honi buruz

Egin ezazue galdera hau: transkribapen honi buruz, AI-ak atal egokiak aurkituko ditu eta erantzungo du.

Beste bat transkribatu