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53 lines
1.1 KiB
53 lines
1.1 KiB
/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.util.function;
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/**
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* Represents an operation on a single operand that produces a result of the
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* same type as its operand. This is a specialization of {@code Function} for
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* the case where the operand and result are of the same type.
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*
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* <p>This is a <a href="package-summary.html">functional interface</a>
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* whose functional method is {@link #apply(Object)}.
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*
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* @param <T> the type of the operand and result of the operator
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*
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* @see Function
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* @since 1.8
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*/
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@FunctionalInterface
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public interface UnaryOperator<T> extends Function<T, T> {
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/**
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* Returns a unary operator that always returns its input argument.
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*
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* @param <T> the type of the input and output of the operator
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* @return a unary operator that always returns its input argument
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*/
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static <T> UnaryOperator<T> identity() {
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return t -> t;
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}
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}
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