| 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.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 | OptionalLong. orElseGet(LongSupplier other)Return the value if present, otherwise invoke  otherand return
 the result of that invocation. | 
| Modifier and Type | Method and Description | 
|---|---|
| static LongStream | LongStream. generate(LongSupplier s)Returns an infinite sequential unordered stream where each element is
 generated by the provided  LongSupplier. | 
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