| Package | Description | 
|---|---|
| java.util | Contains the collections framework, legacy collection classes, event model,
date and time facilities, internationalization, and miscellaneous utility
classes (a string tokenizer, a random-number generator, and a bit array). | 
| 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 | 
|---|---|
| static void | Arrays. parallelSetAll(int[] array,
              IntUnaryOperator generator)Set all elements of the specified array, in parallel, using the
 provided generator function to compute each element. | 
| static void | Arrays. setAll(int[] array,
      IntUnaryOperator generator)Set all elements of the specified array, using the provided
 generator function to compute each element. | 
| Modifier and Type | Method and Description | 
|---|---|
| int | AtomicIntegerArray. getAndUpdate(int i,
            IntUnaryOperator updateFunction)Atomically updates the element at index  iwith the results
 of applying the given function, returning the previous value. | 
| int | AtomicInteger. getAndUpdate(IntUnaryOperator updateFunction)Atomically updates the current value with the results of
 applying the given function, returning the previous value. | 
| int | AtomicIntegerFieldUpdater. getAndUpdate(T obj,
            IntUnaryOperator 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. | 
| int | AtomicIntegerArray. updateAndGet(int i,
            IntUnaryOperator updateFunction)Atomically updates the element at index  iwith the results
 of applying the given function, returning the updated value. | 
| int | AtomicInteger. updateAndGet(IntUnaryOperator updateFunction)Atomically updates the current value with the results of
 applying the given function, returning the updated value. | 
| int | AtomicIntegerFieldUpdater. updateAndGet(T obj,
            IntUnaryOperator 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 IntUnaryOperator | IntUnaryOperator. andThen(IntUnaryOperator after)Returns a composed operator that first applies this operator to
 its input, and then applies the  afteroperator to the result. | 
| default IntUnaryOperator | IntUnaryOperator. compose(IntUnaryOperator before)Returns a composed operator that first applies the  beforeoperator to its input, and then applies this operator to the result. | 
| static IntUnaryOperator | IntUnaryOperator. identity()Returns a unary operator that always returns its input argument. | 
| Modifier and Type | Method and Description | 
|---|---|
| default IntUnaryOperator | IntUnaryOperator. andThen(IntUnaryOperator after)Returns a composed operator that first applies this operator to
 its input, and then applies the  afteroperator to the result. | 
| default IntUnaryOperator | IntUnaryOperator. compose(IntUnaryOperator 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 IntStream | IntStream. iterate(int seed,
       IntUnaryOperator f)Returns an infinite sequential ordered  IntStreamproduced by iterative
 application of a functionfto an initial elementseed,
 producing aStreamconsisting ofseed,f(seed),f(f(seed)), etc. | 
| IntStream | IntStream. map(IntUnaryOperator mapper)Returns a stream consisting of the results of applying the given
 function to the elements of this stream. | 
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