Java

This article is based on JDK 1.8. Use of CountdownlatchThe previous article described volatile and the use of volatile to achieve spin locks, such as the tool class under the Java.util.concurrent.atomic package. However, volatile usage

Objective:Recently the company has made a tool to package this tool into a running program, and writing Start.bat and start.sh can run under both Windows and Linux.On the internet to find a lot of information, finally found a reliable information,

Quality is a key factor in measuring a website, and I personally think the quality of these sites is very good. Next, I will share with you how I use these sites to learn and entertain. You might think that some sites are suitable for any level of

Wait,notify,notifyall is an instance method defined in the object class, used to control the state of threads, and when a thread is collaborating, everyone uses the Notify () or Notifyall () method. Where wait and notify is an important part of the

Main contents of garbage collection:1. Which memory needs to be recycled?2. When is it recycled?3. How to recycle?Garbage collection is primarily for those areas of the runtime data area?The thread private areas of the runtime data area are: Virtual

Clone is copied as its name implies, and in the Java language, the Clone method is called by the object, so the object is copied. The so-called Replication object, the first to allocate a source object and the same size of space, in this space to

What is reflection, why is it useful, and how to use it?1. What is reflection?"Reflection is typically a capability that a program running in the JVM needs to detect and modify the behavior of the runtime program. This concept is often confused with

Advantage ⒈ the inner class object can access the implementation of the object that created it, including private data, ⒉ internal classes are not seen by other classes in the same package, and are well encapsulated, ⒊ can easily write event drivers

What is reflection, why is it useful, and how to use it?1. What is reflection?"Reflection is typically a capability that a program running in the JVM needs to detect and modify the behavior of the runtime program. This concept is often confused with

Whether you are a new programmer or a veteran, you must have encountered a thread-related problem in your interview. An important feature of the Java language is the built-in support for concurrency, which makes Java popular with businesses and

1.pomorg.apache.kafkakafka_2.100.10.2.1org.apache.kafkakafka-clients0.10.2.12.KafkaTopicBean Public classKafkatopicbean {PrivateString topicname;//Topic name PrivateInteger partition;//partition number of partitions PrivateInteger replication;/

Recently encountered a project need to turn Word into a PDF, Baidu has a lot of options on the Internet, such as virtual printing, to Word extension, etc., these programs rely on MS Word program, in Java code also have to use such as Jacob or jcom

2018.03.09 Shenzhen le Wei TechnologyI looked at the feeling that the company looks pretty good, interview my husband is also very good, the atmosphere should be very good, but I lack of strength, alas, successive efforts, the following interview in

Recently encountered a project need to turn Word into a PDF, Baidu has a lot of options on the Internet, such as virtual printing, to Word extension, etc., these programs rely on MS Word program, in Java code also have to use such as Jacob or jcom

Earlier Oracle released Java 10, the first version of Oracle's change-release strategy, Java,oracle has decided to release a new Java version every six months, shortening the cycle, but not that we need to learn more, but that after shortening the

Lassloader primarily serves the request of a class, when a class is required by the JVM, it requires the class according to the name, and then returns the class object of ClassLoader by ClassLoader.ClassLoader is responsible for loading all of the

In the Java language, the following questions about character set encoding (Character set encoding) and internationalization (i18n), which are correct?A. Each Chinese character occupies 2 bytes, and each English character occupies 1 bytesB. Assuming

IntroductionThis article will explain several properties of string.One, the immutability of stringFor beginners, it is easy to mistakenly think that a string object can be changed, especially when the + link, the object seems to really change.

Exceptions for Javabase class for all exceptions and errors in 1.Java: ThrowableThrowableError Exception(Exception at check-in) (Run-time exception)RuntimeExceptionExceptions in 2.Java are divided into run-time exceptions and check-time exceptionsA

Use POI to read the Execl table, return an object (may be a bit imperfect, but should be able to meet the usual use), the use of reflection and so on;The jar packages used