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File class recursive exercise Receive a folder path from the keyboard and count the size of the folder Solution: Create keyboard entry objectDefine infinite loopStore and encapsulate the result of keyboard entry into File objectJudge the File objectReturn the folder path objectDefine a summation variableGet all files and folders under t ...

I happen to have some research on spring source code. Combined with my practical work experience in recent years, I summarize the knowledge points I think are good in spring. I hope it will be helpful to you. Seek attention Welcome to pay attention to my B station accountStation B account number If the content can help you, you are welcome to ...

Loss of request header in Feign remote call in single thread Code case Order service: Controller: /** * When the goods are selected in the shopping cart service and click "go to settlement", the order service is triggered. * This controller is mainly used to return order settlement details and other information * ...

brief introduction I want to develop a social networking site. Storing friends list on social networking sites has become a big problem in the development process. If I want to save every user's friend information, how should I save it? The user's id corresponds to the friend's id. such a message is a friend relationship map. This relati ...

1. Bubble sorting Bubble sorting principle: 1) Compare two adjacent elements. If the preceding element is larger than the following element, exchange the two numbers. After the first traversal, the maximum number will be placed at the last position of the array, that is, array[length - 1]. 2) The last element is skipped during the second trav ...

References: What is the difference between deep cloning and shallow cloning? How are they realized catalogue 1, Introduction to deep cloning and shallow cloning 1. Overview 2. Implementation of copy function 2, Implementation of deep cloning 1. Clone all objects 2. Deep cloning is realized by construction method 3. Deep cloning throu ...

1. Single case mode elements Ensure that there is only one instance in a class and provide a global access point a.Private construction method b.Private static references point to their own instances c.Public static method with its own instance as return value 2. Hungry Han style single example public class Hungry { //Priv ...

1. Code block overview Code block: also known as initialization block, it is a member of a class, similar to a method. It encapsulates logical statements in the method body and is surrounded by {};And methods: 1. No method name, no return value, no parameter, only method body;2. It is not called explicitly through an object or class, but im ...

Environment construction In addition to the xml in the previous document, a context:component constraint should be added 1. xml configuration <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www. ...

1, Foreword The basic part of the Spring framework is too long. It is divided into several articles to consolidate the learning record. 1. What is Spring The spring framework was created due to the complexity of software development. Spring uses basic JavaBean s to accomplish things that could only be done by EJB s before. However, the use o ...