java code snippets for practice

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);

: This article describes how to call the private method through reflection in php and java. if you are interested in the PHP Tutorial, refer to it. There is a general problem in a single test, and the private method in the side class cannot be called directly. During the process, Xiao Yan reflected and changed the method permission to perform a single test, shared it, and directly added the code. Simple t

the change is minimized . According to this idea, I think of the consistency hash, think this should be able to meet the requirements.Second, the use of consistent hash to solve the problemThe definition of a consistent hash or introduction in the third section, now write a consistent hash of the Java solution. Only write example implementation code, the first and foremost is the choice of hash algorithm,

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

table obtains some not the rule law: is not the law of Law:ON the cusp, you can change the condition. Let the condition change with the outer loop. With a pointed face, you can initialize the value so that the initialization changes with the outer loop. 4, Print diamond (◇) or pyramid/* ----* ---* * --* * * -* * * * * * * * * * * * * * -* * * * --* * * ---* * ----* */ Copy Code code as follows:

].split (".") [0]94Filesuffix = Filefullname[len (filefullname)-1].split (".") [1] the the #Print ("File Full name:", Filefullname[len (Filefullname)-1]) the #Print ("File name:", FileName)98 #print ("File suffix:", filesuffix) About -fileparent = Path[0:len (path)-Len (Filefullname[len (filefullname)-1])]101NewFileName ="Decryption _"+ Filefullname[len (filefullname)-1]102Newfilepath = Fileparent +NewFileName103 104 #Print ("File Parent path:", fileparent) the #print ("New

; 650) this.width=650; "src=" Https://s5.51cto.com/wyfs02/M01/07/05/wKiom1nCJVnwvUEWAAAhG4LOApM274.png "style=" float : none; "title=" 16.png "alt=" Wkiom1ncjvnwvuewaaahg4loapm274.png "/> 650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M01/A5/B6/wKioL1nCJSWAkSvkAAAMaSguaw8190.png "style=" float : none; "title=" 17.png "alt=" Wkiol1ncjswaksvkaaamasguaw8190.png "/> 650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M00/07/05/wKiom1nCJVnxekLhAAAQzRb53-Y170.png "style=

Reference website:Http://wiki.apache.org/hadoop/Hbase/ThriftApiEnvironment: hbase-0.98.1-cdh5.1.0,hadoop-2.3.0-cdh5.1.0,centos6.5 x64,thrift21. Introducing MAVEN DependenciesHBase has integrated thrift, and if Java does not have to install thrift to generate the server code, only the following dependencies are introduced:2. Turn on Hbase-thrift serviceThe use of THRIFT2,THRIFT2 is an upgraded version of thr

Maven Project version number Default version number: 1.0-snapshot The best practice is to contract the version to an unstable version if the release must be deleted; Recommended version rule: Major version number. The minor version number. Delta Version number- Common commandsThe built-in MAVEN plugin provides a common command to find the corresponding package in the following location:. m2\repository\org\apache\maven\plugins

node of first start node for(inti = 0;child! = 0;i++) { child=tree[start][i]; if(child! = Root) {//prevent the child from start from becoming the father of startDFS (child, start); dp[start][1] + = dp[child][0];//start backtracking when the child node does not have a children nodedp[start][0] + = (dp[child][1] > dp[child][0]? dp[child][1]: dp[child][0]); } } } public Static voidmain (string[] Args) {main test=NewMain (); Scanner in=NewScanner (system.in); intn =In.next

@ Interface indicates that this is an annotation type @ Retention three policies are provided Retentionpolicy. runtime: not only in the source code stage, but also in the JVM where the annotation confidence is added during the runtime. Retentionpolicy. Class: in the source code stage, the annotation information is saved during the compilation stage. Annotation @ retention default value. Retentionpol

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

dic.keys () print dic.get (" Key1 ") print dic ["Key1"]print sys.path# function called Test Func. Funcshow (); #FuncShow ();p rint "Result:" +str (Func.add(100,200)) Print __doc__; #返回注释print nonesystest.py#-*-coding:gbk-*-"" "System Call" "" Import Osfilehandle=open ("C:\\1.txt", "W") Filehandle.write (" I am a programmer ") Filehandle.close () Filehandle=open (" C:\\1.txt "," R ") print Filehandle.read () object-oriented python#-*-CODING:GBK-*-" The object-oriented Python self is the default

strictly follow the use of volatile conditions-that is, the variable is really independent of the other variables and its own previous values-in some cases you can use the volatile substitution synchronized to simplify the code. However, volatile the code used is often more error-prone than code that uses locks. The pattern described in this article covers some

) {e.printstacktrace (); } } } } After the run, the print results become ACBACB. To avoid this uncertainty related to JVM scheduling. The a,b,c three threads need to be started in a certain order, with the final code as follows: Public classMyThreadPrinter2ImplementsRunnable {PrivateString name; PrivateObject prev; PrivateObject Self; PrivateMyThreadPrinter2 (String name, Object prev, object self) { This. Name =name; Thi

such as on are also called subscriptions published to the channel (using the Publish and subscribe commands), in addition to subscription publishing to mode (using Psubscribe to subscribe to a pattern) Subscribe to all CCTV channels 127.0.0.1:6379> psubscribe cctv* Reading messages ... (Press Ctrl-c to quit) 1) "Psubscribe" 2) "cctv*" 3) (integer) 1 When a CCTV1 message is still pushed first, the client receives it normally. The implementation of Pub/sub in

Java Practice question: rabbit problem This question is also called the Fibonacci sequence (Fabonacci), the first person to study the series is the Leonardo of Pisa (also known as the Fibonacci), which he used to describe the number of rabbits growing. The first month there are a couple of newborn rabbits. After the second month, they can have babies. Every month a pair of fertile rabbits will be born, and

1.The formal parameter is the parameter that is set when the function is defined. For example function Head int min (int x,int y,int z) x, y, Z are the formal parameters. The actual arguments are the actual arguments that are used when the function is called. real arguments are actually passed.A formal parameter can be an object, and a reference is passed when the object is.for formal arguments, only the final modifier can be used, and any other modifier causes a compiler error.However, with thi

= 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 i

Kotlin is a new JVM-based language that can be seen as the extended language of Java, developed by JetBrains, who first saw him in the company's Android team when they saw them using the Kotlin to develop Android, suddenly feeling curious, and then slowly studied the prophecy.Why to develop and use the Kotlin language, the official saying is:Concise safeversatileinteroperableAnd cite an example:Nullif for youfun calculatetotal (obj:any) { if (obj is