java util stream stream example

JAVA programming (17) ----- prepare file copy software process input stream output stream NIO progress bar bottom copy Multithreading Using NIO to copy files at the underlying layer (byte) multi-threading technology elementary applications run programs without blocking Package com. lovo. homework01; import java. awt.

Java IO stream data stream transmissionYou can use this as a formula.//Data Flow TransmissionImportJava.io.*; Public classindex{ Public Static voidMain (string[] args)throwsexception{//You can use this as a formula.//no memory .Bytearrayoutputstream Zjszl =NewBytearrayoutputstream (); DataOutputStream SJL=NewDataOutputStream (ZJSZL); LongAA = 123456789;

1. Introduction of NiO (New io stream)JDK4 appears nio. The new IO and the traditional IO have the same purpose, are used for the input and output, but the new IO uses a different way to handle the input and output, in a memory-mapped file, the file or a section of the file map into memory, you can access the same memory as a visiting file, This is much more efficient than the old Io, but there are a lot of places where we see the old IO reference, so

One.After you have finished writing, read it. Now the object being explained has changed from FileWriter to FileReader, from output to input.The explanation of Io flow is always around the character stream, and the foothold is also the two specific subclass object in the character flow.The reader object's methods are described in various ways of reading.The read exception is described.Write the program completely and the results are as follows. When r

be updated and must be closed and re-established OutStream=NewFileOutputStream (FilePath); //OutStream = new FileOutputStream (new File (FilePath)); If the passed parameter is true, then the original file continues to be written, instead of overwriting the source file. //OutStream = new FileOutputStream (FilePath, true); //OutStream = new FileOutputStream (new File (FilePath), true);Outstream.write (Bytearr); } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException

http://www.verejava.com/?id=16994667084611package com.io;import java.io.*;public class TestInputStreamReader{ public static void main(String[] args) { InputStream is=null; try { is=new FileInputStream("res/chinese.txt"); //将inputStream 转换成 Reader Reader reader=new InputStreamReader(is); int l; while((l=reader.read())!=-1) { System.out.println((char)l); } }

watermark/2/text/ahr0cdovl2jsb2cuy3nkbi5uzxqvy2pjmjexmziy/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/ Dissolve/70/gravity/southeast "/>Import java.io.*;p ublic class bufferdemo{public static void Main (string[] args) throws Ioexception{bufferedreader buf= Null;buf=new BufferedReader (New InputStreamReader (system.in)); System.out.print ("Please enter a number:"); String Str=buf.readline ();//parses the string to an integer int i=integer.parseint (str); i=i+10; SYSTEM.OUT.PRINTLN ("The modified

FileOutputStream (file); 3. Start writing data, int a = 10; int Type 4 bytes outputstream.write (a); Note that only one byte outputstream.write (' B ') can be exported at a time. Char type Outputstream.write (5); 0000-0000 0000-0000 0000-0001 1111-1111 = = 511 int b = 511; Greater than eight-bit (9-bit) outputstream.write (b); The actual result is 255, but the int c = 63 is not shown; Less than eight bits (6 bits) Outputstream.write (c); Garbled//4. Close resource Outputstream.close (); }

1. In fact, the byte stream itself does not use a buffer (memory) during operations, but directly operates on the file itself. The swap stream uses a buffer during operations and operates through the buffer zone.Composition. That is, the byte stream uses a buffer while the byte stream does not.2. all files are stored i

value.optionalIt should be noted that accumulator should meet the binding (associative).ToArray ()Places the elements in the stream into an array.CombinationThe concat is used to connect two streams of the same type.public static “TransformationThe ToArray method converts a stream into an array, and if you want to convert to another collection type, the West needs to call the Collect method and use the Col

tool library for us to quickly create a Collector. As we have learned earlier, the collector function must meet the identity constraints and related item constraints. The following constraints must be observed when you create a Collector in a library that is simplified based on Collector (for example, Stream. collect (Collector:Convert to another set Many Stream

specified byte array to this output stream. Other common methods: Void close (); // close the output stream and release all system resources related to the stream. Void flush (); // refresh the output stream and forcibly write all buffered output bytes.File input and output streams: FileInputStream and FileOutputStrea

("File2.txt"); FileReader FIS=NewFileReader (InFile); FileWriter Fos=NewFileWriter (OutFile); intC; while((c = Fis.read ())! = 1) {fos.write (c); } fis.close (); //fos.close ();Fos.flush ();//If this statement is not available, the File2.txt file is empty}Catch(FileNotFoundException e) {System.out.println ("FileStream:" +e); } Catch(IOException e) {System.out.println ("FileStream:" +e); } }} Flush (); Statement force buffer output, no technology if using FileInputStream byte

bits) for Chinese characters. UTF-8 contains all the characters needed by all countries in the world, is an international code, universal. 20. Change the standard input/output device The System class in the java. lang package contains the setIn and setOut methods, which are used to re-allocate standard input streams and output streams respectively.1 import java. io. *; 2 public class TransStreamDemo5 3 {4