java 8 parallel stream

PrintStream (print output stream) and javaprintstream in JavaPrintStream in Java (print output stream)PrintStream is a print output stream that inherits from FilterOutputStream. PrintStream is used to decorate other output streams. It can be added to other output streams so that they can easily print various data value

1. Basic ConceptsIo:java the operation of the data is through the flow, IO flow is used to process the data transfer between the devices, upload files and download files, Java for the operation of the flow of objects are in the IO package.Classification of 2.IO StreamsDiagram: (Primary IO stream) 3. Byte stream (1). Byte

There are many other streams in the Java. Io package, mainly to improve performance and ease of use. C/C ++ can only provide byte streams. In Java, streams are divided into two types: byte streams and merge streams, which are represented by four abstract classes respectively (each type of stream includes two types of inputs and outputs, so there are four in total

frees all system resources associated with the stream. Therefore, you can only call the Close method of the outer flow to close the inner laminar flow of its adornment, to verify the example:Throws Exception { new FileOutputStream ("D:\\a.txt"new OutputStreamWriter (FOS, "UTF-8" New BufferedWriter (OSW); Bw.write ("Java IO close Test"); Bw.close ();}Ver

Bixiangdong _ Java basic video tutorial 19th _ IO stream (11 ~ 12), _ java_io19th-11-IO stream (byte stream File read/write operations) Import java. io. fileInputStream; import java. io. fileOutputStream; import

FileInputStream, each time it reads 512 bytes from the source program file Openfile.java, stores it in buffer buffers, and then constructs the string new string with the value in buffer ( Buffer) is displayed on the screen. The program is as follows (this example is placed in the package Biz.1cn.stream, in addition, please create a TestFile.txt file in the root directory for normal operation):1 PackageBiz.1cn.stream; 2 ImportJava.io.FileInputStream; 3 Importjava.io.IOException; 4

outputstream to writer Transformation Bridge, its subclass filewriter is actually a concrete class to implement this function; * */public class IO {public static void Main (string[] args) throws IOException {//character stream string path = "Data/data"; BufferedReader br = new BufferedReader (new InputStreamReader (New FileInputStream (path), "Utf-8")); String line = "", while (line = Br.readline ())! = nu

the reason and thought of character stream appearing ? Because the byte stream operation Chinese is not particularly convenient, so Java provides a character stream. Character stream = byte stream + encoding table. Coding

input and output. They convert byte streams into the bridge converter of the dense stream and can specify the encoding/decoding method.Reader and writer (parent stream class, all parent stream types)1) Use of Java TechnologyUnicodeAnd provides a 16-bit stream to process cha

): Pipedreader, PipedWriter, PipedInputStream, PipedOutputStream 3.File file Stream Read and write to files: FileReader, FileWriter, FileInputStream, FileOutputStream 4. Objectserialization Object input, Output: ObjectInputStream, ObjectOutputStream 5.DataConversion Data Flow Read and write by basic data type (processed data is the basic type of Java (such as Boolean, Byte, Integer, and floating-point numbe

The Java.io.File class is used to represent files (directories)The file class is used only for information (name, size, etc.) that represent files (directories) and cannot be used for access to file contentRandomaccessfile Java provides access to the contents of a file that can be read or written.Randomaccessfile supports random access to files and can access any location in the file(1) Java file modelThe f

[],intOffintLenBooleanAppendthrowsIOException;6 Public voidWritebyteB[])throwsIOException {7Writebytes (b, 0, B.length, append);8 }9 Public voidWritebyteB[],intOffintLenthrowsIOException {Ten Writebytes (b, off, Len, append); One}View CodeExamples of FileInputStream and FileOutputStream: Implementing File Replication.Content in the FileIn.txt file:Abcdefgheretrtrt1 ImportJava.io.File;2 ImportJava.io.FileInputStream;3 ImportJava.io.FileOutputStre

stream.Conversion flow: Inputstreamreader/outputstreamwriter, converting bytes into charactersBuffered buffer stream:: Bufferedinputstream,bufferedoutputstream,bufferedreader,bufferedwriter, is a processing stream with buffers, bufferingThe main purpose of the district is to avoid dealing with the hard disk every time and improve the efficiency of data access.Object flow: Objectinputstream,objectoutputstre