| 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. 
 | 
 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, 2014, Oracle and/or its affiliates.  All rights reserved.