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1, Fail fast When traversing a collection object with an iterator, if the contents of the collection object are modified (added, deleted, modified) during the traversal, an exception will be thrown ConcurrentModificationException. one ️⃣ Principle: the iterator directly accesses the contents of the collection during traversal, and uses a mod ...

1. Hexadecimal character to integer number Function: convert hexadecimal string to hexadecimal number. I didn't find the corresponding library function, so I wrote a function manually with reference to the online code. The commonly used functions are ATOI and Atol, which convert decimal digit strings into int or long types, so they are not ap ...

Article catalogue preface 1, What is a function? 2, Function classification and call 1. Nested call of user-defined functions 2. Chain access of user-defined functions 3. Recursive call of user-defined functions (key points) summary preface This paper introduces the basic knowledge of C language functions, including function c ...

Let's first look at the overall effect 1. Logical induction In fact, there is not much logic to develop in the coffee details page, and it is not easy to write it down as a whole. The logic to be realized is summarized as follows: The name of the coffee details page is obtained after the previous Slice is passedWhen the temperature ...

Catalogue of series articles Chapter I gin preliminary understanding Chapter 2 setting API Note: The series of articles are learning notes corresponding to the original English books mentioned aboveRelated to their own practice code, including comments, on my gitee Welcome, starAll contents are allowed to be reproduced. If the cop ...

Reasons for locking: Multitasking to grab a resourceMultitasking requires writing to resourcesMultitasking access to resources is mutually exclusive 1. What happens when you are multithreaded without using locks Define a generated order ID class, that is, a resource for multitasking public class OrderNumGenerator { //Global order id ...

github.com/dtm-php/dtm-client introduce dtm/dtm-client Is a distributed transaction manager DTM The PHP client of has supported the distributed transaction mode of TCC mode, Saga mode and two-stage message mode, and has realized the communication with DTM Server by HTTP protocol or gRPC protocol respectively. The client can run safely in the e ...

Rust Web Rokcet Series 2 connection database and CURD addition, deletion, modification and query Original text: https://www.ftls.xyz/posts/rust-rocket2/ Author: macabing sugar Serial address: https://blog-kkbt.vercel.app/series/rust-web-rokcet/ sqlite database is used. In fact, all kinds of databases are similar. There are already many packa ...

https://github.com/dtm-php/dt...introducedtm/dtm-client Is a distributed transaction manager DTM The PHP client of has supported the distributed transaction mode of TCC mode, Saga mode and two-stage message mode, and has realized the communication with DTM Server by HTTP protocol or gRPC protocol respectively. The client can run safely in the e ...

oracle simple introduction oracle concept oracle is a relational database. It has a large database. The large database is composed of one or more instances. Each instance is composed of background processes and logical data. Multiple table spaces and multiple users can be created under one instance. Each user has a default table space, and ...