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Detailed Description of Virtual Machine Performance Monitoring and Fault Handling Tools 4.1 Overview This article refers to Chapter IV of Zhou Zhiming's "Deep Understanding of Java Virtual Machine", in order to sort out ideas, simply record it for later reference. JDK itself provides a lot of convenient monitoring tools for JVM perfor ...

In order to better control multithreading, JDK provides a threading framework Executor to help programmers effectively control threads. The Java.util.concurrent package is designed for Java concurrent programming. There are many written tools under it:                    Brain Map Address Thank you. Deep and shallow Java Concurrency This brai ...

Vector introduction Vector is also based on arrays. It is a dynamic array whose capacity can grow automatically. Vector is introduced by JDK 1.0, many of its implementation methods have added synchronization statements, so it is thread-safe (in fact, it is only relatively safe, sometimes it is necessary to add synchronization stateme ...

Before looking at Condition s, let's look at the following example: Factory class, used to store and take out goods: public class Depot { private int depotSize; //Warehouse size private Lock lock; //exclusive lock public Depot(){ depotSize = 0; lock = new ReentrantLock(); } /** * ...

Project Requirements: Timing Tasks How to achieve it? spring has its own timing task, jdk has its own Timer, quartz implementation. Advantages and disadvantages, spring, annotation-based implementation, simple configuration, but rich tasks in the latter stage, after the modification of configuration is more difficult, and not easy to cont ...

The first two articles are mainly about registering the subclasses of AbstractAutoProxyCreator from two entries. Here is the implementation logic: First, look at the class diagram to find the location of AbstractAutoProxyCreator in spring: Indexed AbstractAutoProxyCreator is essentially BeanPostProcessor, which implements the logic of proxy ...

1. Functional introduction The Spring framework provides an abstract interface between thread pool and timed task execution: TaskExecutor and Task Scheduler to support asynchronous and timed task execution. At the same time, the abstract interface defined by the framework itself is used to shield the differences between the underlying JDK versi ...

1. overview HashMap Source Code Detailed Analysis (JDK 1.8): https://segmentfault.com/a/1190000012926722 Java 7's entire Concurrent HashMap is a Segment array. Segments are locked by inheriting ReentrantLock, so each operation that needs to be locked is a segment, so as to ensure that each Segment is thread-safe, it also achieves global thread ...

Tool preparation ​JDK Since it is a Java protocol, JDK is essential, but the largest version of JDK supported by lr11 is only jdk1.6, and it must be 32 bits. ​ jdbc connects jar packages To connect to oracle database, you need to prepare the database-driven jar package and select the corresponding version of the jar package acc ...

Decorator mode, which dynamically adds a series of actions to an object through this design mode, without the need to generate a large number of inheritance classes due to the differences in these actions.This pattern is almost ubiquitous in JDK, for example: java.io.BufferedInputStream java.io.FileReader ... These classes are familiar eno ...