Programmer Group

Original Link: https://my.oschina.net/u/1590001/blog/268213 Memory is not as good as bad pen. Here's tomcat brain-free optimization 1. Memory settings (VM parameter tuning)(1). In Win ...

Horse Soldier High Concurrency Programming Series Record https://www.bilibili.com/video/av11076511/?spm_id_from=333.788.videocard.4 ReentrantLock1 reentrantlock used instead of synchronized In this example, because m1 locks this, m2 cannot execute u ...

static keyword in java I. Static overview We can create multiple objects based on a class, each object has its own members, and the values of all member variables exist according to the object. Sometimes we want all objects of a class to share a me ...

Java Hungry Han and Lazy Singleton Patterns There is a strange Dragon named GiantDragon in LOL, only one, so this class can only be instantiated once Step 1: Singleton mode Singleton mode, also known as Singleton mode, refers to a class in which only one instance exists in a JVM. Step 2: Hungry Han singleton mode GiantDragon should only have on ...

Scenario introduction Jstack is used to generate thread snapshots of the current time of the java virtual machine. Thread snapshots are a collection of method stacks that are being executed by each thread in the current java virtual machine. The main purpose of generating thread snapshots is to locate the causes of long thread pauses, such as ...

Singleton mode can be written as long as it is a qualified development, but if you want to go deeper, a small singleton mode can involve many things, such as: Is multithreading safe?Is it lazy to load?Performance, etc.Do you know how to write several singleton modes?How do I prevent reflection from destroying the singleton mode? 1. Single Case ...

Preface 1. Work reason, use jvm-sandbox more, then do source code analysis, to know each other, personal ability is limited, if there are errors, welcome to correct.2. About what jvm-sandbox is, how to install it, and how to move it Official Documents3. Source analysis is based on jvm-sandbox Latest master code, tag-1.2.1.4. The tentative plan ...

Introduction to Dynamic Agent Originally a direct call to the function of the proxy object, but now it indirectly calls the function of the proxy object through a proxy object. When indirectly invoked, we can increase the function we want to achie ...

Common Basic Classes 1. Date class Date represents a specific instant, accurate to milliseconds. Most methods in the Date class have been replaced by methods in the Calendar class. Membership methods in the Date class: 1. Judging the front and b ...

Long ago, people did not want to use processes in order to continue to enjoy the benefits of parallelism, so they created lighter threads than processes. Taking linux as an example, creating a process needs to apply for new memory space and copy some data from the parent process, so the overhead is relatively large. Threads (or lightweight proc ...