| Package | Description | 
|---|---|
| java.util.concurrent.atomic | A small toolkit of classes that support lock-free thread-safe
 programming on single variables. | 
| 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 | 
|---|---|
| long | AtomicLongArray. getAndUpdate(int i,
            LongUnaryOperator updateFunction)Atomically updates the element at index  iwith the results
 of applying the given function, returning the previous value. | 
| long | AtomicLong. getAndUpdate(LongUnaryOperator updateFunction)Atomically updates the current value with the results of
 applying the given function, returning the previous value. | 
| long | AtomicLongFieldUpdater. getAndUpdate(T obj,
            LongUnaryOperator updateFunction)Atomically updates the field of the given object managed by this updater
 with the results of applying the given function, returning the previous
 value. | 
| long | AtomicLongArray. updateAndGet(int i,
            LongUnaryOperator updateFunction)Atomically updates the element at index  iwith the results
 of applying the given function, returning the updated value. | 
| long | AtomicLong. updateAndGet(LongUnaryOperator updateFunction)Atomically updates the current value with the results of
 applying the given function, returning the updated value. | 
| long | AtomicLongFieldUpdater. updateAndGet(T obj,
            LongUnaryOperator updateFunction)Atomically updates the field of the given object managed by this updater
 with the results of applying the given function, returning the updated
 value. | 
| Modifier and Type | Method and Description | 
|---|---|
| default LongUnaryOperator | LongUnaryOperator. andThen(LongUnaryOperator after)Returns a composed operator that first applies this operator to
 its input, and then applies the  afteroperator to the result. | 
| default LongUnaryOperator | LongUnaryOperator. compose(LongUnaryOperator before)Returns a composed operator that first applies the  beforeoperator to its input, and then applies this operator to the result. | 
| static LongUnaryOperator | LongUnaryOperator. identity()Returns a unary operator that always returns its input argument. | 
| Modifier and Type | Method and Description | 
|---|---|
| default LongUnaryOperator | LongUnaryOperator. andThen(LongUnaryOperator after)Returns a composed operator that first applies this operator to
 its input, and then applies the  afteroperator to the result. | 
| default LongUnaryOperator | LongUnaryOperator. compose(LongUnaryOperator 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 LongStream | LongStream. iterate(long seed,
       LongUnaryOperator f)Returns an infinite sequential ordered  LongStreamproduced by iterative
 application of a functionfto an initial elementseed,
 producing aStreamconsisting ofseed,f(seed),f(f(seed)), etc. | 
| LongStream | LongStream. map(LongUnaryOperator mapper)Returns a stream consisting of the results of applying the given
 function to the elements of this stream. | 
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