16- The UnaryOperator Interface

Jul 01, 2026 04:06 · 1:13 · English · Whisper Turbo · 2 发言者

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S… Speaker 1 (16- The UnaryOperator Interface)

The last functional interface we're going to talk about is the unary operator.

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S… Speaker 1 (16- The UnaryOperator Interface)

As you can see,

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S… Speaker 1 (16- The UnaryOperator Interface)

this interface extends the function interface.

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S… Speaker 1 (16- The UnaryOperator Interface)

So a unary operator is a function that takes an argument

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S… Speaker 1 (16- The UnaryOperator Interface)

of type t and returns a value of type t.

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S… Speaker 1 (16- The UnaryOperator Interface)

So let's see how we can use this interface.

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S… Speaker 1 (16- The UnaryOperator Interface)

I'm going to declare a unary operator of

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S… Speaker 1 (16- The UnaryOperator Interface)

integer called square and set it to a lambda expression

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S… Speaker 1 (16- The UnaryOperator Interface)

like this.

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S… Speaker 1 (16- The UnaryOperator Interface)

n goes to n times n.

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S… Speaker 1 (16- The UnaryOperator Interface)

We can declare another unary operator

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S… Speaker 1 (16- The UnaryOperator Interface)

of type integer and call it increment and

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S… Speaker 1 (16- The UnaryOperator Interface)

set it to a lambda like this,

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S… Speaker 1 (16- The UnaryOperator Interface)

n goes to n plus 1.

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S… Speaker 2 (16- The UnaryOperator Interface)

So,

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S… Speaker 1 (16- The UnaryOperator Interface)

first we can increment a value and then we can

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S… Speaker 1 (16- The UnaryOperator Interface)

get the square of the result.

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S… Speaker 1 (16- The UnaryOperator Interface)

Now,

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S… Speaker 1 (16- The UnaryOperator Interface)

let's apply the sequence on 1.

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S… Speaker 1 (16- The UnaryOperator Interface)

So we're going to increment 1,

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S… Speaker 1 (16- The UnaryOperator Interface)

we get 2,

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S… Speaker 1 (16- The UnaryOperator Interface)

the square of 2 is 4.

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S… Speaker 1 (16- The UnaryOperator Interface)

Let's get the result and print it to

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S… Speaker 1 (16- The UnaryOperator Interface)

verify that our sequence of operations are working.

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S… Speaker 1 (16- The UnaryOperator Interface)

There you go.

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S… Speaker 1 (16- The UnaryOperator Interface)

So this is how we can use the unary operator in

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S… Speaker 1 (16- The UnaryOperator Interface)

Java

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