Programmer Think

Before reading this article, you need to understand how to define enumeration and its simple use enumeration 1, How the JVM handles enumerations A simple enumeration class public enum Fruit{ APPLE(67),ORANGE(68),BANANA(69); int code; Fruit(int code){ this.code=code; } } Decompile fruit. Using the Jad command C ...

Understanding of Java loading and execution: There are two very important stages of java programs: Compile phase: the source file will be java becomes a bytecode file class (compiling is essentially checking whether the syntax is correct) Run phase: the JVM will load the bytecode file and interpret the bytecode Basic data type Basic data ty ...

After the previous three sections, I believe you have a clear understanding of the AQS principle at the bottom of ReentrantLock. Next, let's introduce some concepts in ReentrantLock: The concept of fair and unfair lock How does ReentrantLock achieve unfairness and fairness? What is a reentrant lock? Fair lock Vs non fair lock Fair lock Vs ...

OpenJDK System. Analysis of loadlibrary source code System.loadLibrary is used to inform the JVM to load Native so. After so is loaded successfully, you can see that so has been loaded into memory in / proc/self/maps. Students familiar with system layer development can guess that this is basically equivalent to dlopen/LoadLibrary call. Next, l ...

Set root password for the first timesudo passwd root1, Installing nginx1. Apt get installation commandsudo apt-get install nginxError: "Unable to locate package nginx"Solution: execute the command before installation to update the software sourcesudo apt-get updateLocation of nginx files after installation:/usr/sbin/nginx: main progra ...

1, Content summaryThis paper mainly focuses on the ThreadPoolExecutor in JDK. Firstly, it describes the construction process of ThreadPoolExecutor and the mechanism of internal state management. Then, it uses a lot of space to explore the process of ThreadPoolExecutor thread allocation, task processing, rejection policy, start and stop, and foc ...

abstract This blog will introduce the LinkedHashMap class in detail LinkedHashMap basic data structure We know that HashMap is out of order, that is, the order of iterators has nothing to do with the insertion order. On the basis of HashMap, LinkedHashMap adds order: insert order and access order respectively. That is, when traversing Linked ...

In recent days, I have studied sorting algorithm and read many blogs. I found that some articles on the Internet do not explain sorting algorithm thoroughly, and many codes are wrong. For example, some articles directly use the Collection.sort() function to sort each bucket in the "bucket sorting" algorithm, which can achieve results, ...

abstract After JDK1.8, generics have been introduced into the JDK source code, but many beginners, junior engineers and even intermediate engineers do not understand this generics deeply enough. This paper introduces the concept and use of java generics in detail. What are generics? Generic, or "parameterized type". When referring ...

HashTable Attribute members //hash table array private transient Entry<?,?>[] table; //Number of elements private transient int count; //Expansion threshold private int threshold; //Load factor private float loadFactor; //Number of changes private transient int modCount = 0; Constructor ...