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Preface Numbers are often represented and passed by strings in certain fields.So how do we tell if a string is a number?Let's talk about this topic today. Empty characters and null First, it's clear that empty characters''and null are definitely not numbers.We actually write the same logic.Some of the most extreme and easily discernible logica ...

I. overview CAS, Compare And Swap, that is, compare and exchange. When Doug Lea is implementing synchronous components, CAS technology is used extensively and Java multi-threaded concurrent operation is implemented artificially. The whole AQS synchronization component, Atomic atom class operation, ...

Preface I believe that many senior and middle-level students in JAVA will often encounter an interview question during the interview.How do you tune and locate JVM problems in your work? In fact, if the number of users is small and your code is normal, how can we accumulate experience in this field unless we really encounter few problems relate ...

Preface Language: Java Environment: IntelliJ IDEA JDK Version: 1.8 Source code: GitHub Overview of Search Algorithms and Efficiency Analysis Algorithm name Time complexity Spatial complexity Sequential search O(n) O(1) Binary search O(log2n) O(1) Interpolation search O(log2(log2n)) O(1) fibonacci search O(log2n) O(n) In order t ...

Preface: The source code of ArrayList is analyzed, and the reason why the average performance of inserting and deleting elements is poor is also analyzed. This introduction is more suitable for insertion and deletion of container LinkedList, of cours ...

Online Problem Resolver Arthas BTrace was introduced before. The use of BTrace, an online problem solving tool It's also an online problem sorter.They are all artifacts, but today this is also very powerful. It's hard to say if it's more powerful, but it's very simple to use.If you're using BTrace, you need to write the probing script in advanc ...

Introduction of Intermediate Key Products At present, IBM's WebSphere and Oracle's Weblogic occupy a part of the market share of the java language Web sites. Both of these two software are commercial software, which are applied to the Web scenarios of large Internet companies due to their superior performance and high reliability. Since versi ...

1. Origin of Enumeration Assume a scenario first, and now there is a requirement.You are asked to create an Employee class with an attribute role.The company has three roles: BOSS, MANAGER and WORKER.So how do we define this class? We'll impleme ...

ThreadLocalMap uses the open address method to solve the conflict problem, and our protagonist HashMap uses the linked list method to deal with the conflict. What is the linked list method? data structure In the hash table, each "bucket& ...

In the previous article, we analyzed the accept process in the process SelectedKey method. This article will analyze the read process in the work thread. private static void processSelectedKey(SelectionKey k, AbstractNioChannel ch) { final NioUnsafe unsafe = ch.unsafe(); //Check the SelectionKey Is it valid? If it is invalid, close ...