63 docs tagged with "computer-science"

题目 NOTE 1. 要点不要忘了最后的进位 2. 两个单链表可以长度任意 java

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

How to write a annotation processor and use in Java Project

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

代码来自改视频改写 算法思维：该算法是在插入排序的基础上优化的 插入元素下标i，从0 ~ i-1找插入该元素的位置，

算法思维：第一层for循环控制趟数，第二层for循环从j=0和j=1开始比较 如果发现前面比后面大则互换位置 优化：当第一趟下来 没有元素交换，说明该数组已经有序了不需要排序 java

Camunda BPMN workflow engine internals, interceptors, and state machine

<details> <summary>Global Exception Handling Class ExceptionHandlingController</summary> java package com.whalefall.learncases.exception;

1. 基于XA协议的：二阶段提交和三阶段提交 2. 基于时间补偿机制：TCC 基于业务层面实现 3. 本地消息表：基于数据库+mq，通过mq调用服务，完成响应后回调，将状态盖好才能完成。需要配合定时任务扫描，重发消息调用服务，需要保证幂等性；(不推荐使用)

A write to a final field inside a constructor and the subsequent assignment of the reference of the constructed object to a reference variable cannot be reordered. The first read of a reference to an object containing a final field and the subsequent first read of this final field cannot be reordered.

This design implements an annotation-driven business-template registration engine, automatically binding business implementation classes and corresponding processing templates at startup through the @UseTemplate annotation, implementing the decoupling of business logic and processing flow. - ✅ Annotation-driven automatic registration mechanism - ✅ Generic type safety check

just execute this will be ok. shell title="handler method" git config --global https.proxy http://127.0.0.1:7890

代码来自该视频 github仓库

插入排序 将i元素插入到下标为0~i-1的位置上，逐个比较，如果发现前面的元素比arr[i]大 则将该元素后移 否则将i元素放入到空位置上 java package whale.simpleAlgorithm;

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

Simple Demo Code

Overloading: Same class, same method name, other parts different Overriding: Parent-child class, same method name, (same name, two small, one big) same parameter list, return value, exception type, modifier

Using Spring-Boot with Resttemplate requires no extra packages<br/> <details> <summary>Controller</summary> java package whalefall.filedownloadorup;

Difference between Object-Oriented and Procedure-Oriented: - Procedure-oriented focuses more on each step and its order, object-oriented focuses more on which objects and what capabilities they have - Procedure-oriented is more direct, while object-oriented is easier to reuse, extend and maintain Three Main Characteristics: Encapsulation: Hide internal details, only provide external interfaces

See blog 1. Reduce resource consumption 2. Improve response speed 3. Improve thread manageability corePoolSize: Core thread count, Number of threads created for normal work

Go to Maven Repository to find the corresponding dependency and download it. Go to the download directory and execute the following command, replacing -DgroupId, -DartifactId, -Dversion, -Dfile

!20250922223849 1. Fetch binary stream: Get the binary stream defining the class by its fully qualified name.

For details please see. For reordering that changes program execution results, JMM requires compilers and processors to prohibit such reordering. For reordering that does not change program execution results, JMM makes no requirements for compilers and processors (JMM allows such reordering).

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

This article organizes two common testing methods: 1. Pure Unit Testing (Mockito + JUnit) 2. Spring Boot Testing (@SpringBootTest excluding auto-configuration) Features: - Does not depend on Spring container

Kafka deployment, Docker Compose, and Spring Boot integration

本文代码来自于中国大学MOOC

> NOTES: All content taken from Java 8 Functional Programming java public Set<String> findLongTracks(List<Album> albums) { Set<String> trackNames=new HashSet<>();

 Locks are user-facing, defining the interface for users to interact with locks (e.g. allowing two threads to access in parallel), hiding implementation details;

代码来自

视频链接 算法思路：将两个局部有序的数组归并为一个有序的数组

本文代码来自MyBatis Plus官网 1. 配置依赖

此文章借鉴MyBatis官网，使用gradle构建项目，使用oracle数据库

创建user表 sql SET NAMES utf8mb4; SET FOREIGNKEYCHECKS = 0; -- ---------------------------- -- Table structure for user

!20250922233019 !20250922233035

sql CREATE [OR REPLACE] PROCEDURE [schema.] procedurename [parametername] [[IN] datatype [{:=|DEFAULT} expression]

Installation steps address ORA-01078: failure in processing system parameters

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

java package whale.leetcode.simple; / @Author: WhaleFall541 @Date: 2021/5/31 23:22 / public class PowerOfFour {

Relax the order of write-read operations in the program, thus producing the Total Store Ordering memory model (abbreviated as TSO). On the basis of the above, continue to relax the order of write-write operations in the program, thus producing the Partial Store Order memory model (abbreviated as PSO).

- Problem definition, determine whether it is internal system problem or other system problem, or network reason - If serious, consider rollback (or restart application) first, solve problem first, then find reason for problem - Reason: Connection pool problem (used in thread pool), slow SQL problem, Full GC problem etc.

Guide to configuring Python pip sources, virtual environments, and Jupyter notebooks in VSCode

代码源自该视频 算法思想：选择一个中心点，将比中心点小的移动到左边，反之移动到右边； 这时形成两个子序列，对子序列递归直至，每个序列只有一个元素为止；

RabbitMQ reliability, consumption patterns, and queue types

参考视频 github仓库地址

Redis common issues, cache penetration, avalanche, and configuration

python from rulesmodule import rules import re, os def replacecontentinfile(filepath, replacementrules):

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

算法思维：从0到n-1每次取一个为i， 和i后面的元素进行比较 令int k = i;如果发现比i位置上的还小，则将该位置的角标赋值给k。 最后交换i 和 k的位置；每一趟都能排好一个最小的值。

代码参考该视频 算法思维： 说明 arr.length = n; 增量序列为 seq; 间隔 span = seq[p]

A bug finds in those of tasks where you need change the date by the nature. <br/> Firstly You should inject a prototype bean to spring context, instea

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

<font color='red'>本文摘自 周志明 凤凰架构：构建可靠的大型分布式系统</font>

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

避免使用锁：无锁并发编程，多线程竞争锁时，会引起上下问文切换，所以多线程处理时，可以用一些办法来避免使用锁，如将数据的ID按照Hash算法取模分段，不同的线程处理不同段的数据 CAS算法：java的atomic包使用CAS算法来更新数据，而不需要加锁

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)

Please refer to [spring-framework](https://github.com/Halcyon666/spring-framework-modified/tree/main/spring-test) for code related to this article (from official source spring-test module)