public abstract interface UnaryOperator<T>
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Represents an operation on a single operand that produces a result of the same type as its operand. This is a specialization of Function for the case where the operand and result are of the same type.

This is a functional interface whose functional method is apply(Object).

extends Function<T, T>

<T>    the type of the operand and result of the operator

See also:

Since:  1.8