java 8 parallel stream

CodeFlow Operation Law----keyboard input data stored in a file Public classTransStreamDemo3 { Public Static voidMain (string[] args)throwsIOException {bufferedreader br=NewBufferedReader (NewInputStreamReader (system.in)); BufferedWriter BW=NewBufferedWriter (NewOutputStreamWriter (NewFileOutputStream ("E:/out.txt"), "Utf-8")); String Line=NULL; while(line = Br.readline ())! =NULL) { if("Over". Equals (line)) Break; Bw.write (l

The logging here is implemented using the print stream.The content in the text message is of type string. And like writing data in a file, we often use the file output stream object FileOutputStream.1 New File ("F:\\a.txt"); 2 New FileOutputStream (file,true); // The second argument is an append text 3 outputstream.write (97);After the above code executes, the content in A.txt is a, because the write method receives data of type Byte, and 97 correspon

What is a stream?Flow in Java refers to a buffer that flows in a calculationClassification of streamsThe main differences between character streams and byte streams are: When a byte stream is read, it returns a byte when it is read, and the character stream reads one or more bytes using the byte throttle (the

In Java 8, the stream cannot be reused, and once it is used or consumed, the stream is closed. 1. Example–stream has been closed! Looking at the example below, it will be thrown a illegalstateexception that says "stream is closed"

("Ran.txt", "RW");//Throw abnormal raf.write ("Assad". GetBytes ());//Use the default character set of the platform to encode this String as a byte sequence and store the result in a new The byte array. Raf.writeint (97);//can write basic data type Byte, int accounts for 4 bytes three spaces +araf.write ("Adelaide". GetBytes ()); Raf.writeint (98); Raf.close ();}Random writes and detailspublic static void Randomwrite () throws Ioexception{randomaccessfile RAF = new Randomaccessfile ("Ran.txt",

Buffered Stream buffer: Set buffer for faster execution efficiencySub-class:(i) Bufferedinputstream: buffer input byte stream, purpose: Improve the efficiency of reading filesNote: Bufferedinputstream He is not capable of reading and writing dataInternal implementation: You maintain a byte array of 8 bytes.Steps to use:1. Locate a target file.2. Establish the cha

, "utf-8"); Osw.write ("Hello! ");//Do not write flush cannot flush buffered write file, close Close file also has this functionOsw.write (' Medium ');//write single characterOsw.write ("First meeting, please take more care", 2, 3);//write a part of a string; start with the second character, write three altogether char[] ch = {' present ', ' Day ', ' Down ', ' rain '}; Osw.write (CH); //write array osw.write (CH, 2, 2); //Starting from the

whose data is written to a file. ObjectOutputStream This class will implement serialization of the serialized object after it is written to the specified place. the output stream of the PipedOutputStream pipeline is the sending end of the pipeline.3.objectstream,inputstream are often used with FileInputStream and FileOutputStream. (used when initializing)New ObjectOutputStream (new FileOutputStream ("logon.out"));The 4.File class does

("!hello World!"); //use the methods in the buffer to flush the data to the destination file. Bufw.flush (); //closes the buffer while closing the FW stream objectBufw.close (); }}BufferedReader:test.txt------The >java programConstruction method: BufferedReader br = new Bufferreader (Reader in);Main methods: int read (); Reads a single character.int read (char[] cbuf,int off,int len);//reads a character in

I. Comprehensive exercises-List of file listingsGets the file (including subdirectories) of the specified extension under the specified directory, and writes the absolute path of the files to a text file. Which is to create a list of files with the specified extension.1. Deep traversal2. Container with filter3. Writing filesImport Java.util.list;import Java.io.*;import Java.util.arraylist;public class Main {public static void main (string[] args) throws IOException {file dir = new file ("D:\\

Reprint please indicate source: http://www.cnblogs.com/lighten/p/7063161.html1. PrefaceThe previous chapters have introduced all paired (input and output) byte streams in the Java IO Package, and this chapter describes some of the remaining byte streams, including: Linenumberinputstream, Sequenceinputstream, StringBufferInputStream. In JDK8 's version, only the middle sequenceinputstream were not discarded, and the other two were indicated to be obsol

Java IO (input output) stream 1. The buffer of the upstream stream 1. What is the buffer, also known as the cache, is a part of the memory space. That is to say, a certain amount of storage space is reserved in the memory space, which is used to buffer input or output data. This reserved space is called a buffer zone. The buffer zone is divided into the input buf

); - to //The enumeration type is received, as shown in +Sequenceinputstream s=NewSequenceinputstream (e); - theFileOutputStream outputstream=NewFileOutputStream ("D:\\Program Files (x86) \\io\\sequence4.txt"); * intlength; $ while((Length=s.read ())!=-1){Panax Notoginseng outputstream.write (length); - } the f1.close (); + f2.close (); A f3.close (); the s.close (); + outputstream.close (); - } $ $}Bufferedinputstream : A buffered byte inp

statement.The Optional class is like a container that stores a value of the type or a null value. By using the isPresent () method of the Optional class, we can check whether the specified object is empty. package demo.ch;import java.util.Optional;public class Java8OptionalDemo { public static void main(String[] args) { Optional str = Optional.ofNullable(null); System.out.println("str having value ? " + str.isPresent()); // output : str having value ? false }}

ArticleDirectory Pipeline stream (thread communication Stream) Pipeline stream (thread communication Stream) The main function of a pipeline stream is to communicate between two threads, namely, pipedoutputstream and pipedinputstream ),If you want to output a p