10- The Supplier Interface

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

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The supplier interface is the opposite of the consumer interface.

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So instead of consuming a value,

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it supplies a value.

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So if you look at the documentation,

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

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which returns a value of type T.

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So this interface is also a functional interface and we

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can represent it using a lambda expression.

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Let me show you.

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So let's declare a supplier of double,

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call it get random,

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and set it to a lambda expression.

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

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

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in this case double.

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

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the lambda operator,

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

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

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we can simplify this lambda expression.

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That is why the return keyword is grayed out.

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

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replace this with a simpler lambda.

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Take a look.

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So empty parenthesis goes to math .random.

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We don't need the curly braces,

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we don't need the return keyword either.

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Now, this lambda expression represents a function.

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To call this function,

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we should type get random dot get.

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So this will return the random value,

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and we can print it over here.

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So every time we run this program,

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we get a different value.

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Now,

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

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until we explicitly call it.

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This is called lazy evaluation.

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So the value is not generated until we explicitly ask for

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it.

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Also, just like the consumer interface,

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this supplier interface has a few specializations for working with

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primitive values.

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So we have double supplier,

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we have int supplier,

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we have long supplier and boolean supplier.

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So if you're working with primitive values,

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prefer to use this primitive specializations of the supplier interface because

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

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a reference type and then

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unboxing it later on.

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So that's all about the supplier interface.

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

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