java programmer certification

CloudDocker and VirtualizationMicro-Service ArchitectureV: Performance OptimizationAny out-of-details PPT Architect is bullying, up can be a strategist, down to solve the first-line performance problems, Java technology system, need to understand:Performance Index SystemJVM TuningWeb TuningDB tuningVI: Bottom-level knowledgeFrom the architecture design, to the application layer tuning, and then in-depth understanding of the underlying principles, sol

A soldier who doesn't want to be a general is not a good soldier, so every Java programmer should make himself better, to increase his core competence, and a non-enterprising Java programmer is easy to be eliminated by society. So how to become a good Java

#, ASP, and so on, or PHP, C + +, Python, and other programming languages.But did not think, incredibly many do Java to transfer other languages. Hurriedly opened the station on a classic "Java Programming ideas", browse the preface and directory, seemingly Java in all aspects is very powerful!Maybe some do Java lose

conjunction with Nginx and so on, it is very convenient for everyone, will not repeat it. The completion of the deployment, the next log and monitoring, are very common problems, the log has a corresponding library, and monitoring are dependent on professional monitoring platform, their own information output is good, please allow me to show the spring boot Remoteshell terminal monitoring, In addition to the regular HTTP output JSON information (with the health check, meter data, Dump, request

classification of unit tests that I understand2. Benefits of implementing Unit tests3. Java Programmer Unit Testing Tool LibraryDefinition and classification of unit testsThe definition of unit tests refers to the code that programmers write to test the logic code. In my understanding, unit tests are divided into the following two categories:Code testingCode testing refers to the implementation of the code

Program | Programmer Java Programmer must read: basic articles Time: 2001/09/13 13:31 Author: ZSC Pacific Network College 　 2.6 What is an interface An interface is a contract that collects methods and constant forms. When a class executes an interface, it promises to declare that all methods are executed in that interface. An interface is a device or a s

Remoteshell terminal monitoring, In addition to the regular HTTP output JSON information (with the health check, meter data, Dump, request tracking and a series of rest output), but also brought a similar top tall on the device, ssh -p 2000 user@localhost after the execution dashboard can see this real-time update of the interface. Summarize So much to summarize the full text of the view-although go in the language is very good, but also into a lot of best practices, but combined with many con

--------------------------Java Training, Android training, look forward to communicating with you! ---------------------------The concept of framework and the principle of reflection implementation Framework Learning SummaryFirst, the concept1. Frame:　　Technical implementation of calls to currently undefined or non-implemented objects through the reflection technology of Java.　　For example: Developers buil

(3,5);2 Changestringvalue (PT1);3System. out. println (PT1);4 }5 //Change B of string in variable to a6 Private Static voidchangestringvalue (Object obj) throws Exception {7Field[] Fields=Obj.getclass (). GetFields ();8 for(Field field:fields) {9 if(Field.gettype () ==string.class){//The comparison is whether the bytecode is the sameTenString old= (String) field.Get(obj); OneString News=old.replace ('b','a'); AField.Set(obj, news); - } -}V. Method classD

Use super and this to access objects and constructors Use abstract classes and interfaces Handling Exceptions Differentiate among checked exceptions, unchecked exceptions, and Errors Create a try-catch block and determine how to exceptions alter normal program flow Describe the advantages of Exception handling Create and invoke a method that throws an exception "Recognize common exception classes (such as NullPointerException, Arithmeticexcpetion, arrayinde

, constructor, method, definition. Note content can be resolved by the tool Javadoc.exe in the JDK, generating a set of documentation that is described in the form of a Web file.Note: annotations usually have two functions: (1) Note Description of the program code, and (2) can be used to debug the program.Five, Java The naming rules for identifiers in(1) consists of letters, numbers, underscores, and $, and cannot begin with a number.(2)

As a novice programmer interview or technical learning sometimes blind, no clue, in fact, look back, the general aspect is relatively clear.1. Java aspects(1) Java syntax(2) data structure, 8 kinds of basic data types, String, StringBuffer, Stringbuild,map, collection(3) Multithreading, lock, Singleton mode, thread pool(4) Message mechanism(5) agent, design mode(

 Dark Horse Programmer--java Foundation--Inner class------Java Training, Android training, iOS training,. NET training, look forward to communicating with you! -------Inner classIf class a requires direct access to the Members in class B , then class B needs to establish an object of class a . In this case , the class A is defined directly in class B for ease o

Program | programmer Java programmer must read: Basic articlesTime: 2001/09/13 13:31 Author: ZSC Pacific Network College 　 Two. Object-oriented Programming If you've never used an object-oriented language before, you'll need to understand the concept before you start writing Java code. You need to understand what

Source Link: Bat through train--to be a stingy Java programmer--oriented to the GC programming PS: Welcome to the bat through train to get the latest experience of bat old driver foreword It's much easier to develop Java development than C + +, because programmers don't have to care about trick memory issues. The highly optimized GC mechanism of the JVM ensures t

(such as a Python dictionary literal syntax) mapped to JSON. Because of this, mapping from Java objects to JSON sometimes requires complex object instantiation and mapping, and vice versa. There are a variety of JSON libraries currently competing in this field, andJackson is the most popular, but Jackson's documentation needs to be perfected. Analog (Mocking)Mockito solves many of the pain points in testing Java