Programmer Group

Preface Implement a handwritten WC program and package it to run on the cluster. Create a Maven project and import pom Engineering catalogue Import pom <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/X ...

java.util.concurrent provides many synchronizers, such as the commonly used ReentranLock, ReentrantReadWriteLock, Semaphore and CountDownLatch. They all rely on the processing provided by the AbstractQueuedSynchronizer class. ReentranLock ReentranLock is a reentrant Lock, similar to synchronized. The b ...

jdk version 1.8 StringBuffer and StringBuilder inherit from the same parent class AbstractStringBuilder. The source code of append is respectivelyStringBuffer @Override public synchronized StringBuffer append(String str) { toStringCache = null; super.append(str); return t ...

1. Factory Mode 1.1 What is factory mode Separation of creator and caller is implemented, factory mode is divided into simple factory, factory method, abstract factory mode 1.2 Factory Mode Benefits Factory mode is one of our most common instantiated object modes, replacing the new operation with ...

Hello, this is a blog to keep learning for your dreams.This is the first article to share my understanding of Agent Mode. The style of the article will always be told in a question and answer way, which is one of my personal favorites and is equivalent to a simulated interview.( What is an agent? Let's imagine a scenario where a French winer ...

This article will introduce the following points, readers and friends can also first think about the relevant issues: What does the thread interrupt method mean, is it a thread interrupt?Can the current thread continue execution? There are several ways to tell if a thread is interrupted, and what is the difference between them? What is the dif ...

1 byte code technology application scenario AOP Technology Lombok de duplication plug-in Dynamically modify class files, etc 2-byte technology advantage Java bytecode enhancement refers to modifying and enhancing the function of Java bytecode after it is generated, which is equivalent to modifyi ...

Application scenarios of observer mode The dynamic notification of wechat friend circle in life, the email notification in work, the broadcast notification on the school playground, the event response of the computer desktop application and so on are all real life scenes of the observer mode. Observer Pattern defines a one to many dependency be ...

I. Introduction When a program uses a class, if the class has not been loaded into memory, the JVM will load the class through three steps: loading, linking, and initializing. 2, Class loading, linking, initialization 1, loading Class loading refers to reading class files into memory and creating ...

Introduce In the comments of ArrayList, JDK tells us that when ArrayList (JDK 1.2) is used as a thread shared variable, it is unsafe for threads. We are recommended to lock or use connection. Synchronized List (), while Vector (JDK 1.0) is not recommended, because the premise of Vector to ensure threa ...