| Package | Description | 
|---|---|
| java.io | Provides for system input and output through data streams,
serialization and the file system. | 
| java.lang | Provides classes that are fundamental to the design of the Java
 programming language. | 
| java.nio | Defines buffers, which are containers for data, and provides an overview of the
other NIO packages. | 
| java.nio.file | Defines interfaces and classes for the Java virtual machine to access files,
 file attributes, and file systems. | 
| 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 | Utility classes commonly useful in concurrent programming. | 
| java.util.jar | Provides classes for reading and writing the JAR (Java ARchive) file
format, which is based on the standard ZIP file format with an
optional manifest file. | 
| java.util.regex | Classes for matching character sequences against patterns specified by regular
expressions. | 
| java.util.stream | Classes to support functional-style operations on streams of elements, such
 as map-reduce transformations on collections. | 
| java.util.zip | Provides classes for reading and writing the standard ZIP and GZIP
file formats. | 
| Class and Description | 
|---|
| Stream A sequence of elements supporting sequential and parallel aggregate
 operations. | 
| Class and Description | 
|---|
| IntStream A sequence of primitive int-valued elements supporting sequential and parallel
 aggregate operations. | 
| Class and Description | 
|---|
| IntStream A sequence of primitive int-valued elements supporting sequential and parallel
 aggregate operations. | 
| Class and Description | 
|---|
| Stream A sequence of elements supporting sequential and parallel aggregate
 operations. | 
| Class and Description | 
|---|
| DoubleStream A sequence of primitive double-valued elements supporting sequential and parallel
 aggregate operations. | 
| IntStream A sequence of primitive int-valued elements supporting sequential and parallel
 aggregate operations. | 
| LongStream A sequence of primitive long-valued elements supporting sequential and parallel
 aggregate operations. | 
| Stream A sequence of elements supporting sequential and parallel aggregate
 operations. | 
| Class and Description | 
|---|
| DoubleStream A sequence of primitive double-valued elements supporting sequential and parallel
 aggregate operations. | 
| IntStream A sequence of primitive int-valued elements supporting sequential and parallel
 aggregate operations. | 
| LongStream A sequence of primitive long-valued elements supporting sequential and parallel
 aggregate operations. | 
| Class and Description | 
|---|
| Stream A sequence of elements supporting sequential and parallel aggregate
 operations. | 
| Class and Description | 
|---|
| Stream A sequence of elements supporting sequential and parallel aggregate
 operations. | 
| Class and Description | 
|---|
| BaseStream Base interface for streams, which are sequences of elements supporting
 sequential and parallel aggregate operations. | 
| Collector A mutable reduction operation that
 accumulates input elements into a mutable result container, optionally transforming
 the accumulated result into a final representation after all input elements
 have been processed. | 
| Collector.Characteristics Characteristics indicating properties of a  Collector, which can
 be used to optimize reduction implementations. | 
| DoubleStream A sequence of primitive double-valued elements supporting sequential and parallel
 aggregate operations. | 
| DoubleStream.Builder A mutable builder for a  DoubleStream. | 
| IntStream A sequence of primitive int-valued elements supporting sequential and parallel
 aggregate operations. | 
| IntStream.Builder A mutable builder for an  IntStream. | 
| LongStream A sequence of primitive long-valued elements supporting sequential and parallel
 aggregate operations. | 
| LongStream.Builder A mutable builder for a  LongStream. | 
| Stream A sequence of elements supporting sequential and parallel aggregate
 operations. | 
| Stream.Builder A mutable builder for a  Stream. | 
| Class and Description | 
|---|
| Stream A sequence of elements supporting sequential and parallel aggregate
 operations. | 
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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.
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