java parallel stream

The IO stream in Java is divided into byte stream and character stream, and each stream also divides the input stream and the output stream.Let's start with the input and output streams: the input and output are for program memory

1. Basic input stream and output streamFlow is one of the most important basic concepts in Java. File read and write, network transceiver, process communication, almost all need to input the output of the place to use the stream. What is a stream for? is to do the input and output. Why does the input and output need t

1. Using a stream to traverse a collectionBrief introduction:Java's collection framework, such as the list and map interfaces and the ArrayList and HashMap classes, makes it easy to manage both ordered and unordered collections. The collection framework has been continuously improved since the first day of introduction. In Java SE 8, we can manage, traverse, and aggregate collections through the flow's API.

"); SYSTEM.OUT.PRINTLN (name);//output: JavaString filename= Filenameutils.getname ("D:\\b.java"); SYSTEM.OUT.PRINTLN (filename);//Output: B.java BooleanA = Filenameutils.isextension ("C.java", "Java"); System.out.println (a);//output True to determine the file suffix method } Public Static voidFunction2 ()throwsioexception{//read the contents of a text fileString S1 = fileutils.readfiletostring (NewFile ("D:\\1.txt"));

1. What is a streamThe stream in Java is an abstraction of a sequence of bytes, and we can imagine a water pipe, except that it is no longer the water that flows in the pipe, but the sequence of bytes. Like currents, streams in Java also have a "flow direction," where an object that is typically read into a sequence of bytes is called an input

-FileInputStream FileInputStream =Newfileinputstream (file); - //3. Create a buffer - //3k in byte[] B =New byte[1024];//generally write 1024 times times the larger the buffer is theoretically set, the higher the efficiency of reading - //4. Reading data to intCount = 0; + while(count = Fileinputstream.read (b))!=-1){ - theSystem.out.println (NewString (b,0, Count)); * } $ //5. Close ResourcesPanax N

Stream is a newly added class of Java 8 that complements the collection class.The stream represents the data stream, and the number of data elements in the stream can be limited or infinite.The difference between stream and other

Package COM.HEPHEC;Import Java.io.File;Import Java.io.FileOutputStream;Import Java.io.OutputStream;public class outputstreamtest{public static void Main (string[] args) throws Exception{OutputStream out=new FileOutputStream (New File ("E:" +file.separator+ "test.txt"));String str= "Zhangsan";Byte[] B=str.getbytes ();//Convert a string to a byte arrayOut.write (b);Out.close ();//Not closed stream}}Result:zhangsanAlthough the byte

.JavaInputStream is the ancestor of all byte input streams, and OutputStream is the ancestor of all byte output streams.Character Stream of 2.JavaReader is the ancestor of all read string input streams, while writer is the ancestor of all output strings.Inputstream,outputstream,reader,writer are abstract classes. So you can't just newByte stream is the most basic, all inputstream and OutputStream subclasses

Fileoutstream, fileinputstream, filereader, and fileewiter are often used to learn Java Io streams. Generally, the byte stream is used to read Chinese characters, because a Chinese character is regarded as a character in the byte stream. A stream is an ordered byte sequence that can be used as an input source or an o

one, byte output streamOutputStream Abstract classThis abstract class is a superclass of all classes that represent the output byte stream. The data of operation is byte, and the basic common function method of output byte stream is defined. BYTE: This stream only operates 1 bytes in the file at a time Stream