T- the type of the operand and result of the operator
@FunctionalInterface public interface UnaryOperator<T> extends Function<T,T>
Functionfor the case where the operand and result are of the same type.
This is a functional interface
whose functional method is
|Modifier and Type||Method||Description|
Returns a unary operator that always returns its input argument.
static <T> UnaryOperator<T> identity()
T- the type of the input and output of the operator
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