java coding practice

1 Use the tool (Code->reformate code) in idea to reformat the code below, and then look at the Code menu to find a feature that feels best for you. Submit, plus your own study number watermark.public class Codestandard {public static void main (String [] args) {StringBuffer buffer = new StringBuffer (); Buffer.append ( ' S '); Buffer.append ("Tringbuffer"); System.out.println (Buffer.charat (1)); System.out.println (Buffer.capacity ()); System.out.println (Buffer.indexof ("Tring")); System.out.p

"); System.out.println ("usage:democlient [Host=localhost] [port=9090]"); System.out.println ("This demo assumes you has a table called \" Example\ "with a column family called \" family1\ "); String host = "192.168.58.101"; int port = 9090; Use passed in arguments instead of defaults if (args.length >= 1) {host = Args[0]; } if (Args.length >= 2) {port = Integer.parseint (args[1]); } int timeout = 10000; Boolean framed = false; Ttransport transport = new Tsocket (host

input. Each line have the number of all possible ways to distribute D CDs among N nephews.Sample Input1 203 100 0Sample Output159049Ask N^d. Large number, Java, the large number of C + + template is really no love, decisive JAVA.Import java.io.*;import java.math.*;import java.util.*;p ublic class Main {public static void Main (string[] arges) { C1/>biginteger N; int D; Scanner cin = new Scanner (system.in); while (Cin.hasnext ())

The following information was drawn from the project:Https://www.cnblogs.com/whenever/p/5526420.htmlHttps://www.cnblogs.com/jpwz/p/5715852.htmlHttps://www.cnblogs.com/sddychj/p/6102192.htmlhttps://zzk.cnblogs.com/s/blogpost?Keywords=java+socket+ Multithreading __requestverificationtoken= Cfdj8gf3jjv4cttdney2uyrcgz0kcosvpzzwlayvpu5r95d1oz8nhsq1qxox6l_ S0tdix36-vqfer-yemgbxg29wz0fs1ft-swezszh4opfatuvkj4sdctgegzuvkv9kknpiiyjcjtrprjpj2jiy8x7rzzhmulspblixf

1.1 Practice of methods1.1.1 Method exercises to get a larger of two data1.1.2 Case Code IVpackage com.itheima_01;import java.util.Scanner;/* * 需求：键盘录入两个数据，返回两个数中的较大值 * * 两个明确： * 返回值类型：int * 参数列表：int a,int b */public class MethodTest {// 返回两个数中的较大值public static int getMax(int a, int b) {if (a > b) {return a;} else {return b;}}public static void main(String[] args) {//创建对象Scanner sc = new Scanner(System.in);//接收数据System.out.println("请输入第一个数据：");int x =

into the buffer or writes to the operating system.Asynchronous Io:aio-based on the idea of event-driven, implemented by Proactor mode. When reading and writing, just call the API's read or write method directly, both of which are asynchronous. When a stream is readable, the operating system streams the readable buffer into the Read method and notifies the application. When the operating system writes the stream that is passed by the Write method, the operating system proactively notifies the ap

Introduction to Java NIO (iii) from theory to practice: using NIO to read and writeGuibin.beijing@gmail.com OverviewReading and writing are the most basic IO processing. Reading from a Channel is very simple. We only need to create a Buffer and then require the Channel to read data to the Buffer. Writing is also very simple. You also need to create a Buffer to fill the data to be written into the Buffer, an

: Reflection function name * @ return ReflectionMethod obj: callback object */protected static function getPrivateMethod ($ strMethodName) {$ objReflectClass = new ReflectionClass (self: CLASS_NAME); $ method = $ objReflectClass-> getMethod ($ strMethodName ); $ method-> setAccessible (true); return $ method ;} The following is an example of calling another type of private method using reflection in java. We know that

LinkedList, because linkedlist to move the pointer.Add and remove,linkedlist are the dominant for new and deleted operations because ArrayList is moving the data.ArrayList space waste is mainly reflected in the end of the list to reserve a certain amount of space, while the linkedlist of the space cost is reflected in its every element needs to consume considerable space.ArrayList is based on an array implementation.LinkedList is based on a linked list implementation. This article is from the

Java.lang.instrument.instrumentation;import Org.apache.bcel.constants;import Org.apache.bcel.classfile.classparser;import Org.apache.bcel.classfile.javaclass;import Org.apache.bcel.classfile.method;import Org.apache.bcel.generic.classgen;import Org.apache.bcel.generic.constantpoolgen;import Org.apache.bcel.generic.instructionconstants;import Org.apache.bcel.generic.instructionfactory;import Org.apache.bcel.generic.instructionlist;import Org.apache.bcel.generic.methodgen;import Org.apache.bcel.g

version of the problem, may use Maven way, actually now can also be directly used in Java engineering development methods, see their favorite. In addition, the latest API development is simpler and supposedly more efficient, so .... Groping all is tears. Hope this article can make everyone less detours. 1 Maven way to establish the project (feasible, personally do not recommend, because the workplace without extranet) ----------specific installation

different serialversionuid and possibly the same. To improve the independence and certainty of serialversionuid, it is strongly recommended that the definition serialversionuid be displayed in a serializable class, giving it a definite value. There are two ways to explicitly define SERIALVERSIONUID:1) In some cases, you want the different versions of the class to be serializable compatible, so you need to ensure that the different versions of the class have the same serialversionuid;2) In some

The practice of Java NIO Communication framework in telecom fieldThis article is wrong, Huawei Telecom Software V1 version of the logic frame composition and Huawei Telecom software V2 MVC version of the logical framework diagram two map is the same picture Another: I think the author encountered in this article due to synchronization IO caused by the history of the problem is more of the architecture pro

[Java concurrent programming practice] ----- "J. U. C": Exchanger We have introduced three synchronization auxiliary classes: CyclicBarrier, Barrier, and Phaser. This blog introduces the last one: Exchanger. Jdk api is introduced as follows: synchronization points of threads that can pair and exchange elements in a pair. Each thread presents a method on the entry to the exchange method, matches with the par

-sonatype?hsCtaTracking=920dd7b5-7ef3-47fe-9600-10fecad8aa32% 7cf59d5f10-099f-4c66-a622-0254373f4a92 Installation, decompression, if you need to modify the port number and other information, you can modify the file \nexus-3.13.0-01\etc\nexus-default.properties Start command go to \nexus-3.13.0-01\bin, Nexus/run can view boot log Use: http://books.sonatype.com/nexus-book/reference3/index.html Adding a publishing node to the POMModify settings.xml Add server account password infor

In the Java Concurrency Programming practice, 4.4 mentions the method of locking the client. This is a validation example, but it is not good to write, but you can see the result. Packagecom.blackbread.test;Importjava.util.ArrayList;Importjava.util.Collections;Importjava.util.List;ImportJava.util.concurrent.ExecutorService;Importjava.util.concurrent.Executors; Public classGoodlisthelper { PubliclistNewA

Plan to write a "Java Concurrent basic Practice" series, counted as my Java concurrency Learning and practice of a simple summary. This is the first of the series that describes the easiest way to quit a concurrent task. After a concurrent task is started, do not expect it to always perform. Due to time constraints, r

= reader.getvalues ();if (str! = null str.length > 0) {if (str[0]! = NULL ! "". Equals (Str[0].trim ())) {List.add (str);}}}} catch (FileNotFoundException e) {Log.error ("Error reading CSV file.", E);} catch (IOException e) {Log.error ("", e);}finally{if (reader! = null)Close CsvreaderReader.close ();}return list;}The above code has several points:1 Specify delimiter and character encoding when initializing Csvreader, if not specified, the default is comma and iso-8859-1, I use GBK, depending

: Collect user actions and use this to recommend things that you might like.Aggregation: Collects files and groups related files.Classification: Learn from existing classification documents, look for similar features in documents, and categorize them correctly for untagged documents.Frequent itemsets mining: grouping a set of items and identifying which individual items will often appear together. Hcatalog. Apache Hcatalog is a mapping table and storage Management Service for Hadoop to build dat

priority-ordered blocking queue that can sort all placed elements (implementing the Comparator interface)29, when a method, can throw interruptedexception, means that this method is a blocking method, if it is interrupted, will prematurely end the blocking state.When you call a blocking method, it also means that itself is called a blocking method because you have to wait for the blocking method to return.If the blocking method throws an interrupt exception, what we need to do is to throw it to