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This blog is from my new book Java System Performance Optimization (tentative name), and welcome to read my new book. The Essence of Spring Boot 2 4.22.1 final cannot help inlining There is an outdated rule that "final keywords are used extensively in java getter and setter methods to support inlining," such as public final String get ...

There is a member variable modCount in ArrayList, which inherits from AbstractList. This member variable records the number of modifications to the collection, which add s or remove s its value by 1 each time. What's the use of this? Let's start with the following test code:   package temp; impo ...

1.HashMap structure HashMap is the data structure of key-value mapping, which is composed of array and linked list. Array is the main body of HashMap, and linked list exists mainly to solve hash conflict. If the location of the array does not contain linked list (the next entry of the current entry points to null), then for searching, adding an ...

First of all, we know that in NIO network programming model, IO operations are directly related to channel, such as client request connection, or sending data to the server, the server must obtain this data from the client channel. So what is Channel Pipeline? In fact, this channel Pepiline is a component added by netty to the native channel. A ...

1. StampedLock characteristics StampedLock is a new read-write lock for JDK 8. Unlike read-write locks, it is not implemented by AQS.Its state is a long variable, state is designed differently from read-write locks, provides three modes to control read/write acquisition, and implements its own synchronous wait queue internally. 1.1 ...

1. Introduction to AQS AQS (java.util.concurrent.locks.AbstractQueuedSynchronizer) is the basic framework class used to construct locks or other synchronization components (semaphores, events, etc.).The internal implementation of many concurrent tool classes in JDK relies on AQS, such as ReentrantLock, Semaphore, CountDownLatch, an ...

Preface Recently, in learning Spring Boot, a series has been opened to record the pits encountered in the learning process. The proverb goes deep and shallow, but my level is still limited. I'm afraid it's hard to do it. So it's called shallow Spring Book. This is the first article in this series to build a simple Hello World See the original t ...

    In the project, we need to do the interface automation test, so we go to do the experiment, and do the experiment from building the test environment. In the process of learning, we will certainly encounter different problems, so we spent two days to make a simple interface automation environment, and also encountered som ...

Reprint address: http://blog.csdn.net/yuanzeyao/article/details/42418977 JNI technology for many Java Developed friends believe that it is not unfamiliar, that is( Java native interface), the local call interface, has the following two main functions: 1. Calling C/C++ Layer Code in java Layer 2. C/C++ Layer Calls java Layer Code ...

Reprint address: http://blog.csdn.net/yuanzeyao/article/details/42418977 JNI technology for many Java Developed friends believe that it is not unfamiliar, that is( Java native interface), the local call interface, has the following two main functions: 1. Calling C/C++ Layer Code in java Layer 2. C/C++ Layer Calls java Layer Code ...