16- The UnaryOperator Interface

Jul 01, 2026 04:06 · 1:13 · English · Whisper Turbo · 2 Høyttalere
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The last functional interface we're going to talk about is the unary operator.
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As you can see,
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this interface extends the function interface.
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So a unary operator is a function that takes an argument
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of type t and returns a value of type t.
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So let's see how we can use this interface.
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I'm going to declare a unary operator of
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integer called square and set it to a lambda expression
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like this.
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n goes to n times n.
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We can declare another unary operator
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of type integer and call it increment and
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set it to a lambda like this,
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n goes to n plus 1.
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So,
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first we can increment a value and then we can
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get the square of the result.
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Now,
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let's apply the sequence on 1.
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So we're going to increment 1,
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we get 2,
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the square of 2 is 4.
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Let's get the result and print it to
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verify that our sequence of operations are working.
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There you go.
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So this is how we can use the unary operator in
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Java

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