java 8 lambda tutorial

follows:1 Bytebuffer Header = bytebuffer.allocate (+); 2 bytebuffer Body = bytebuffer.allocate (1024x768); 3 4 // write data into buffers 5 6 bytebuffer[] Bufferarray = {header, body}; 7 8 channel.write (Bufferarray);The buffers array is the entry for the Write () method, and the write () method writes data to the channel in the order in which buffer is in the array, noting that only data between position and limit is written. Therefore, if a buffe

entirely on proven code.For the utility code above, flexibility and speed are the most important. But you should also understand the limitations of this approach. Reading 1GB files using these techniques will result in an attempt to create a 1GB string Object!FileUtilsThe FileUtils class provides some practical ways to manipulate file objects. Contains read, write, copy, and compare files.For example, you can use the following method to read a whole file:New File ("/commons/io/project.propertie

and write data from a file.Datagramchannel can read and write data on the network through UDP.Socketchannel can read and write data in the network via TCP.Serversocketchannel can listen for incoming TCP connections, like a Web server. A socketchannel is created for each new incoming connection.Basic Channel ExampleThe following is an example of using FileChannel to read data into buffer:1Randomaccessfile Afile =NewRandomaccessfile ("Data/nio-data.txt", "RW");2FileChannel Inchannel =Afile.getcha

If you don't know what Netty is, you can do something. That can be a simple search to find Out. I can only say that Netty is a NIO framework that can be used to develop distributed Java Programs. What can be done, you can try to play the Imagination. Technology is to serve people and not to limit People.If you already have everything, let's start with a piece of code. Programmers are accustomed to the first step, nature is "hello world", but Netty off

This section mainly explains the application of operatorsThe Java operators are divided into:Arithmetic operatorsAssignment operatorslogical operatorsBitwise operatorsTernary operatorsHere is a video to explain the major types of operators, and there are exercises to provide everyoneInterview questions:1. The most efficient way to figure out 2 times 8 equals a few?2. Swap the values of two integer variables

Digital Typically, when we work with numbers, we use the original data type, such as byte,int,long,double. Example int i = 5000; float GPA = 13.65; byte mask = 0xaf; However, in development, we encounter situations where objects need to be used rather than the original data type. To implement this, Java provides a wrapper class for each raw data type. All wrapper classes (Integer, Long, Byte, Double, Float, short) are subclasses of th

Java tutorial -- difference between int and Integer: javaintinteger First, let's talk about the difference between int and Integer: The following is an example: 1 package syswar.cc; 2 3 public class IntegerCompare { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 Integer a1 = 2; 8 Integer a2 = 2;

month, the price should be in what paragraph. Suddenly its price is very low, the system thinks this time is more suitable for purchase. Is the price very low when must buy? You'll have to watch your inventory. The same is true for sales, and we've already estimated that this product will have a big gain by September, and it's going to have a big gain by September. This year also should have, even if it is not up to the highest, according to the year, the first annual increase of 2%, the second

1th Course Introduction and construction of Project framework 1-1 Java High concurrency Mall Second kill optimization Guide 1-2 Project Environment Building (ECLIPSE) 1-3 Project Environment Building (IDEA) 1-4 integrated mybatis 1-5 installing Redis 1-6 integrated Redis on 1-7 integrated Redis under 1-8 integrated Redis 2nd Chapter Implementation of user login and distributed session function 2-1

1th. Course Preparation1-1 Course Guidance1-2 Concurrent Programming First experience1-3 concurrency and high concurrency basic concepts2nd Chapter Concurrency Foundation2-1 CPU Multilevel Cache-cache consistency2-2 CPU Multi-level cache-Random order execution optimization2-3 Java memory model2-4 advantages and risks of concurrency3rd. Project Preparation3-1 Case Environment Initialization3-2 Case Preparation Work3-3 Concurrent Impersonation-Tools3-4