java practice projects

("Redis.pool.testOnBorrow"));//private static Jedispool Jedispool = null;private stat IC ResourceBundle res = resourcebundle.getbundle ("Redis");p rivate static Logger log = Logger.getlogger (Redisutil.class) ; private static String password; private static Jedissentinelpool Jedispool; static {try{string[] servers = res.getstring ("Redis.sentinels"). Split (","); int maxtotal = Integer.parseint (res.getstring ("Redispool.maxtotal")); int maxidle = Integ

1. Create a new app on Heroku2. After successful creation, add support for MySQL, click Find more Add-ons3. I chose Jawsdb Mysql here.4. We can view the configuration of the database after the successful addition5. Then connect to the remote database locally via MySQL Workbench and execute the appropriate SQL statement to create the database and table required by the application6. Then we need to change the settings of the database connection file in the Web project to the corresponding configur

Web projects sometimes experience the need to dynamically generate zip and download, but we do not want to generate redundant temporary files when generating zip files. Below will Introduce my way of handling. There are improper places also hope that everyone criticized the advice. This requirement is described as follows:1. Generate XML files dynamically based on data2. Package a dynamically generated XML file (one or more) into a zip file3. After

Practice: Java Virtual Machine 2 "virtual machine working mode", Java Virtual Machine Today, I started to practice Java Virtual Machine II: "virtual machine working mode ". 5 Series in total One of the actual Java virtual machin

Java log Design Practice (1), java log During daily development and O M, you may encounter the following problems: Under what conditions do I need to output logs? How do I select the log level when it is clear that logs need to be output? When it is clear that logs need to be output, what do logs need to be output? How can I determine the project in

Java log Design Practice (2), java log Several considerations during the design phaseUse Spring Log4jConfigListener to dynamically adjust the Log Level Add the following content to the corresponding web. xml location: Note] 1.Do not setLog4jConfigLocationSpecified// WEB-INF/classes/log4j. properties When log4jConfigLocation is specified as/WEB-INF/classes/l

itDuring the development process, because of the need to constantly modify the code, so during debugging, you can use dynamic loading mode, load user-defined class.Re-edit the Classpath.txt file to remove Dog.jar loading information.Run the following command in MATLAB:>> javaaddpath ('/home/your_username/documents/matlab_java/dog.jar ') >> d = javaobject (' Dog ', ' martin ') d = [Email protected] >> D.getname () ans = martin_1The experimental results also show that the dog is loaded and called

Java generic learning and practice (1), java genericIntroduction After JDK1.5, generic models were introduced, which was hard to understand at the beginning. After learning them slowly, there are some gains. In conclusion, they can not only deepen your understanding, but also help others. Due to my limited level, it is inevitable that something is wrong. please c

Java Theory and Practice: a more flexible and scalable locking mechanism in JDK 5.0 Java Theory and Practice: an analysis of a flawed micro-benchmark Java Theory and Practice: Understanding jts― balance Security and performance

The features of Java robustness are as follows: Java compiles and runs programs to check for possible problems to prevent errors from occurring. The Java compiler can detect errors that many other languages run to discover. Java does not support pointer manipulation, which greatly reduces the likel

Java Programming Practice: Determine whether the Java file name is correct, determine whether the mailbox format is correct, and count the number of times a character in a specified string appears1. Determine whether the Java file name is correct and whether the mailbox format is correct Function: determines whether th

I recently read Java Concurrent in Practice (java Concurrent programming Practice) and found that I have a superficial understanding of java threads, locks, and other mechanisms, and I have not learned fully enough. I plan to use this book to comprehensively learn about the

A JSR 133, which has been active for nearly three years, recently released a public recommendation on how to fix the Java memory model (Java Memory models, JMM). There are several serious flaws in the original JMM, which leads to some incredibly difficult conceptual semantics that were originally considered simple, such as volatile, final, and synchronized. In this period of

Java generic learning and practice (4), java genericIntroduction The first three sections describe the common declarations and usage of generics. Generics can be declared on classes or on a single method, the two cases are summarized respectively. Next we will learn about generic extension. Extended the previous Runnable interface, Buick class, Ford class, Driver

[Java concurrent programming practice] ----- basic thread concepts, java ----- I have been learning Java concurrency for more than a month. I feel that I will forget some things after I have learned it for a while. I have made some notes but not the system. For a "system" with such a large

Java 9 is faster: JShell hands-on practice HowIs it one of the coolest features of Java 9? Last week, I finally took the time to experience a preemptive version of Java 9. The first stop is JShell, which is also called the Kulla project. This is why at first I had the courage to try

[Practical Java high concurrency programming design 4] Arrays can also be unlocked: AtomicIntegerArray, java concurrent programming practice pdf In addition to providing basic data types, JDK also prepares arrays and other composite structures for us. The available atomic arrays include AtomicIntegerArray, AtomicLongArray, and AtomicReferenceArray, which respecti

) {System.out.println ("Less than 3 parameters");return; The String result =""; for(String S:args) {result + = s +" "; } System.out.println ("Parameters:"+ result); }}/** * Output: * parameter: Caroline Wendy girl *///:~11//:allthecolorsoftherainbow/** * Coded style test * Created by C.l.wang on 15/7/6. * * Public class rainbowtest { Public Static void Main(string[] args) {Allthecoloroftherainbow ATC =NewAllthecoloroftherainbow (); Atc.changethehusofthecolor ( -); System.out.println ("Thehu

technologies, there is no need to download plugins or small programs.Ajax has a lot of merit, and it is these strengths that reflect its shortcomings (of course, the shortcomings can be overcome).Disadvantages:1. Security issues2. Support for search engines is relatively weak.3. The exception handling mechanism of the program is broken.4. The original intention of URL and resource location is violated.Actual combata simple, but useful example: TheJava version asynchronously verifies that userna

An object that cannot be modified after the creation state is called an immutable object . Immutable objects are inherently thread-safe. Their constants (fields) are created in the constructor. Since their state cannot be modified, these constants will never change. immutable objects are always thread-safe . An object is immutable only if it satisfies the following state; Its state cannot be modified after it has been created; All fields are final type; It is created correc