| Package | Description | 
|---|---|
| java.util.function | Functional interfaces provide target types for lambda expressions
 and method references. | 
| java.util.stream | Classes to support functional-style operations on streams of elements, such
 as map-reduce transformations on collections. | 
| Modifier and Type | Method and Description | 
|---|---|
| default DoubleUnaryOperator | DoubleUnaryOperator. andThen(DoubleUnaryOperator after)Returns a composed operator that first applies this operator to
 its input, and then applies the  afteroperator to the result. | 
| default DoubleUnaryOperator | 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 | DoubleUnaryOperator. identity()Returns a unary operator that always returns its input argument. | 
| Modifier and Type | Method and Description | 
|---|---|
| default DoubleUnaryOperator | DoubleUnaryOperator. andThen(DoubleUnaryOperator after)Returns a composed operator that first applies this operator to
 its input, and then applies the  afteroperator to the result. | 
| default DoubleUnaryOperator | DoubleUnaryOperator. compose(DoubleUnaryOperator before)Returns a composed operator that first applies the  beforeoperator to its input, and then applies this operator to the result. | 
| Modifier and Type | Method and Description | 
|---|---|
| static DoubleStream | DoubleStream. iterate(double seed,
       DoubleUnaryOperator f)Returns an infinite sequential ordered  DoubleStreamproduced by iterative
 application of a functionfto an initial elementseed,
 producing aStreamconsisting ofseed,f(seed),f(f(seed)), etc. | 
| DoubleStream | DoubleStream. map(DoubleUnaryOperator mapper)Returns a stream consisting of the results of applying the given
 function to the elements of this stream. | 
 Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
 Copyright © 1993, 2015, Oracle and/or its affiliates.  All rights reserved.