java perf tool

Cyclicbarrier Synchronization BarrierThere is a class called Cyclicbarrier in the Java Concurrency Tool class, similar to Countdownlatch, where synchronization between threads is possible, but the difference is that Cyclicbarrier is a reset synchronization barrier.Imagine a scene, there are n people to go to a door at different times, because the door needs n personal force to push, so people less than n wh

In the project we use Java often have the use of authentication function, such as mobile phone number, password and other authentication.To summarize, write a tool class to facilitate the use of the next time directly cited.Package com.common.utils;Import Org.apache.commons.lang3.StringUtils;Import Java.util.regex.Matcher;Import Java.util.regex.Pattern;public class Validationutil {public static Boolean IsMo

java. util. The arrays class makes it easy to manipulate an array, and all of the methods it provides are static. A static method belongs to a class, not to an object belonging to a class. So you can call directly using the class name plus the method name. arrays, as a tool class, can manipulate arrays well. Here are some of the main functions used. 1.fill methodThe Fill method is mainly used to populate th

Hudson is the predecessor of Jenkins and is a continuous integration tool based on Java development for monitoring the repetitive work of the program, including: 1. Continuous software release/test project. 2. Monitor the work performed by external calls. Hudson features 1, easy to install-as long as the Hudson.war is deployed to the servlet container, no database support is required. 2. Easy to configure-a

Java a small tool for logging exception informationPackage com.crm.mess.util;/** * * @author Liangrui * @2015/1/12 * */public class Exceptionslog {public synchronized St atic String Logclzinfo (Exception e) {stringbuffer sb = new StringBuffer (); Sb.append (E.getclass () + "" + e.getmessage () + "\ n"); stacktraceelement[] stacktraceelement = E.getstacktrace (); for (Stacktraceelement traceelement:stacktra

For EXE programs generated by WinForm, the ILSpy.exe tool can be used to hack.can be downloaded via IlspySome programs use obfuscation tools to confuse them, so that the decompile source code is poorly readable and can be used to counter-confuse it with anti-obfuscation toolsDe4dotDe4dot usageWith the command line to the De4dot directory, the call to De4dot.exe (if 64-bit calls De4dot64.exe) is subsequently added to the EXE directory to be anti-aliasi

Parameter hardening usually refers to defining a dataset SQL statement such as SELECT * from [TableName] where [colname] = ${para}, where the contents of ${} are variables and the report tool will ${} After the content is computed, the resulting string is stitched into SQL to form the final executable query statement, which is sent to the database side for execution. ${} You can use the functions in the report to manipulate the parameters, which is th

1. Open various System Tools2. Timed shutdown (reboot, sleep not implemented, please refer to the above two articles to expand themselves)3. Simple File operation Copy Code code as follows: [Java] Package com.cxy.f; Import Java.awt.Image; Import Java.awt.MenuItem; Import Java.awt.PopupMenu; Import Java.awt.SystemTray; Import Java.awt.Toolkit; Import Java.awt.TrayIcon; Import java.awt.event.ActionEvent; Import Java.awt.event.Act

Tags: times different simple jar timing scheduling mechanism time interval mode textA detailed description of the Java Timed Task Scheduler toolWhat is scheduled task scheduling?Tasks that are performed automatically based on a given point in time, at a given time interval, or given number of executions.Timing scheduling tool in Java?Timer QuartzWhat is the diffe

Dark Horse programmer--java Basic I. OverviewJava provides a range of tool classes for manipulating set, list, and map, mainly collections and arrays. The features of the two tool classes are: The methods in the class are static, and you do not need to create the object and call it directly using the class name. Collections: is a

; - Case6: AboutBuffer =NewStringBuffer ("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"); $Sb.append (Buffer.charat (R.nextint (buffer.length)-10))); -Passlength-= 1; - Break; - Case7: AString s =Uuid.randomuuid (). toString (); +Sb.append (s.substring (0, 8) + s.substring (9) + s.substring (+) + s.substring (+ +) + s.substring (24)); the } - $ if(Type! = 7) { the intRange =buffer.length (); the for(inti =

} ------------------------------------------------------ - code to write: - int[] arr = {13, 24, 57, 69, 80}; -System.out.println ("BinarySearch:" + arrays.binarysearch (arr, 577)); - in source code for BinarySearch: - Public Static intBinarySearch (int[] A,intkey) { to //A-arr--{ ------- + //Key--577 - returnBinarySearch0 (A, 0, A.length, key); the } * $ Private Static intBinarySearch0 (int[] A,intFromIndex,intToindex,Panax Notoginseng intkey) { - //A-arr--{ ------- the //FromIndex--0 + //T

1. Download the CXF tool and extract it to disk2. Add the tool bin directory to the PATH environment variable 3. Create a new CXF client project4. Run-cmd to the specified directory and run the batch "Wadl2java.bat" under the Tools directory5. When you are finished, refresh the project in the IDE and you will find the newly generated package + file6. Write the client class to access the WebserivcePackage Co

in the collection with the new values. 6,collections.reverse (list);//Flips the entire list7,collections.reverseorder ();//Returns a comparator object in reverse. TreeSetAdvanced for LoopFormat for (data type variable name: traversed collection or array) {SOP (variable name); but cannot be modified, can only be removed, principle or iterator}import java.util.*; public class Test {public static void main (string[] args) {arraylistvariable ParametersA variable parameter is defined at the last edg

/* *collections Tool class for manipulating List/set *arrays tool class for manipulating arrays */package pack;import java.util.arraylist;import java.util.Arrays; Import Java.util.collections;import java.util.comparator;import Java.util.list;import java.util.TreeSet;public Class Main {public static void Main (string[] args) {//method_collections (); Method_arrays (); } public static void Sys (O

); for(i = 0; i ) {C=Str.charat (i); Sb.append ("\\u"); J= (c >>>8);//Remove the high 8-bitTMP =integer.tohexstring (j); if(tmp.length () = = 1) Sb.append ("0"); Sb.append (TMP); J= (c 0xFF);//Remove the low 8-bitTMP =integer.tohexstring (j); if(tmp.length () = = 1) Sb.append ("0"); Sb.append (TMP); } return(NewString (SB)); } /*** Convert Unicode to String *@paramstr waiting to be turned string *@returnNormal String*/ Public Staticstring re

Array has tool class, aspect manipulation arrayThe collection also has a tool class: collectionsExamples of common methods: Packagedemo;Importjava.util.ArrayList;Importjava.util.Collections;Importjava.util.List; Public classCollectiondemo { Public Static voidMain (string[] args) {function1 (); Function2 (); Function3 (); } Public Static voidfunction1 () {//sort order: Must be a list collection

) {Iarr[i]=value; } } /*** Modifies the value of the specified index of a one-dimensional array and does not modify if the index is out of bounds. * * @paramIarr * Original array *@paramIndex * Indexes *@paramValue * Values*/ Public Static voidSetint[] Iarr,intIndexintvalue) { if(Noarrayindexoutofbounds (iarr.length, index)) Iarr[index]=value; } /*** Sets the value of the specified index for the two-dimensional array. * * @paramIarr * Two-dimensional array *@paramx

1.Array Arrays and Collection Collections Differences(1) Collection ": is an interface that together with its subclasses constitutes a Collection collection framework;Collections: is a class, a tool class that serves collections , and provides a series of static methods for searching, sorting, threading, and so on for various collections. (2) Array: provides a way to dynamically create and access Java ar

In Java EE configuration files, such as XML or properties files, because some sensitive information does not want to be seen by ordinary people, it can be stored in an encrypted manner and decrypted after the program is read. Common such as: Database user password, SMS platform user password, system calibration of fixed passwords. This tool class refers to the "spring.3.x Enterprise application Development