@FunctionalInterface public interface DoubleUnaryOperator
double-valued operand that produces
 a double-valued result.  This is the primitive type specialization of
 UnaryOperator for double.
 This is a functional interface
 whose functional method is applyAsDouble(double).
UnaryOperator| Modifier and Type | Method and Description | 
|---|---|
| default DoubleUnaryOperator | andThen(DoubleUnaryOperator after)Returns a composed operator that first applies this operator to
 its input, and then applies the  afteroperator to the result. | 
| double | applyAsDouble(double operand)Applies this operator to the given operand. | 
| default DoubleUnaryOperator | compose(DoubleUnaryOperator before)Returns a composed operator that first applies the  beforeoperator to its input, and then applies this operator to the result. | 
| static DoubleUnaryOperator | identity()Returns a unary operator that always returns its input argument. | 
double applyAsDouble(double operand)
operand - the operanddefault DoubleUnaryOperator compose(DoubleUnaryOperator before)
before
 operator to its input, and then applies this operator to the result.
 If evaluation of either operator throws an exception, it is relayed to
 the caller of the composed operator.before - the operator to apply before this operator is appliedbefore
 operator and then applies this operatorNullPointerException - if before is nullandThen(DoubleUnaryOperator)default DoubleUnaryOperator andThen(DoubleUnaryOperator after)
after operator to the result.
 If evaluation of either operator throws an exception, it is relayed to
 the caller of the composed operator.after - the operator to apply after this operator is appliedafter operatorNullPointerException - if after is nullcompose(DoubleUnaryOperator)static DoubleUnaryOperator identity()
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