java 8 stream map

1 PackageCom.sxd.test.util;2 3 ImportJava.io.BufferedReader;4 ImportJava.io.BufferedWriter;5 ImportJava.io.File;6 ImportJava.io.FileInputStream;7 ImportJava.io.FileOutputStream;8 Importjava.io.IOException;9 ImportJava.io.InputStreamReader;Ten ImportJava.io.OutputStreamWriter; One A Importorg.junit.Test; - - Public classCreateinsert { the - @Test - Public voidTest ()throwsioexception{ - + //1. Reading files -File File =NewFil

? Baeldung's Java 8 data collection Baeldung is a software development engineer with a passion for spring, REST, TDD and other technologies. He summed up some Java 8 data on his blog. The address is as follows: Http://www.baeldung.com/java8 Jooq BlogJooq is a lightweight

(Request.getinputstream (),"Utf-8"); Char[] Requestchar =New Char[5]; if(Reader! =NULL) {System. out. println ("default encoding:"+reader.getencoding ());//default encoding: UTF8 } //buffer Reader.readline () while(temp = Reader.read (Requestchar))!=-1) {buffer.append (Requestchar,0, temp); System. out. println (Buffer.tostring ()); The String result= Buffer.tostring ();4. File read and write:classkaoshi{ Public Static voidMain

At present, the most IO in Java has a variety of file reading methods, this article compares the performance of Stream,nio Bytebuffer,nio Mappedbytebuffer, let us know how to write high performance file read code. PackageCom.seeyon.nio;Importorg.junit.Test;ImportJava.io.*;ImportJava.nio.ByteBuffer;ImportJava.nio.MappedByteBuffer;ImportJava.nio.channels.FileChannel;/*** Created by Yangyu on 16/12/28.*//*** C

[] {"Dfgha", "Tyui", "ERQQ"};Streaminteger[] Arrayint = new integer[] {10, 20, 50, 40, 60};streamList.stream (). Map (S-s.split (",") [1]). Map (Integer::p arseint). Filter (n-n >= 15). ForEach (System.out::p rintln);After you get the stream, you can use the mapping method: map (lambda expression for conversion)streami

;> 24);//high 8-bit raf.write (i >>>); Raf.write (i >>> 8); Raf.write (i); System.out.println (Raf.getfilepointer ());//You can write a intraf.writeint (i) directly; String s = "medium"; byte[] GBK = s.getbytes ("GBK"); Raf.write (GBK); System.out.println (Raf.length ());//Read the file, you must move the pointer to the head raf.seek (0);//One-time read, read the contents of the file into a byte array byte[

Stream stream uses a data view that allows you to specify actions on a higher-than-set conceptWith the flow, you only need to leave the operation's schedule to the implementation, for example, suppose you want to calculate an average of an attribute, you just need toSpecify data sources and properties, and the Stream class library optimizes calculations, such as

IO flow is mainly used in hard-core, memory, keyboard and other processing equipment data operation, according to the data type of processing data can be divided into: byte stream (abstract base class is InputStream and OutputStream) and character stream (abstract base class for reader and writer). Depending on the flow direction, it can be divided into: input stream