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1, Role of class loader Java code cannot be run directly. It needs to be compiled into binary bytecode files recognized by the JVM through the compiler, and the function of class loader is to convert these binary bytecode files, namely The class file is loaded into the virtual machine so that the virtual machine can run the program. 2, Ja ...

java source code analysis - reflection SecurityManager class In fact, the SecurityManager class is not a member of the reflection related class diagram, but when we view the reflection source code, we often see the following code: checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true); ... private void checkMemberAccess(int ...

1. Opening remarks When it comes to concurrent programming, the first impression in your mind may be Thread, multithreading, JUC, Thread pool, ThreadLocal and so on. Indeed, concurrent programming is an indispensable part of Java programming. Mastering the core technology of concurrent programming will be a sharp weapon in job interviews. Toda ...

Reference articles 1. What is ThreadLocal? And its general purpose (1) Definition (2) function ThreadLocal is used to provide local variables for internal use in threads. In other words, it uses a set of mechanisms to ensure that you create a new variable ThreadLocal. In a thread, set the ThreadLocal variable to an instance a of type A th ...

LinkedList source code analysis 1. Introduction Through the inheritance system, we can see that LinkedList not only implements the List interface, but also implements the Queue and Deque interfaces, so it can be used as a List, a double ended Queue, and of course, a stack.It can be seen from the inheritance system that LinkedList implem ...

Catalogue of series articles AbstractQueuedSynchronizer basic analysis of AQS series Exclusion lock analysis of AQS series 1, Get resources 1. acquire resource public final void acquire(int arg) { if (!tryAcquire(arg) && acquireQueued(addWaiter(Node.EXCLUSIVE), arg)) selfInterrupt(); } This method is th ...

1. Background introduction 1.1 introduction to application background 1) Business features: the traffic peak is concentrated in the daytime, and the traffic is very low in the early morning. 2) Application features: Many core business interfaces are provided externally. After 6 a.m., the traffic increases gradually.In the early morning, we ...

Preface Under what circumstances might ThreadLocal have a memory leak?If you want to understand the context of this problem, it is essential to look at the source code. After looking at the source code, you find that static class Entry extends WeakReference <ThreadLocal<?> {} is actually used in ThreadLocal, and the puzzle is actually ...

concept Starting from JDK 1.7, Java provides the ForkJoin framework for parallel task execution. Its idea is to divide a large task into several small tasks, and finally summarize the results of each small task to get the results of this large task. As a concurrency framework, it was added to our Java and issued in jdk7 java.util.concurrent And ...

1. background To understand when objects are recycled, we need to understand the concept of object reference, so we have the following 2. Reference object structure chart in Java 3. Introduction 3.1. What is strong quotation a. When there is not enough memory, the JVM starts to garbage collect. For a strongly referenced object, even if there i ...