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1: Foreword   friends who have studied Java must have used the four Java collection tools: Comparable, Comparator, Collections and Arrays. I just want to ask you, do these four tools smell good? Very fragrant, ha ha ha. In my opinion, the better the interface tools are used, the less simple the underlying principle implementation will be ...

Tell me about the internal data structure of HashMap? JDK1.8 version, internal use of array + linked list / red black tree. Data structure diagram of HashMap Insertion principle of HashMap Judge whether the array is empty and initialize if it is empty;If it is not empty, calculate the hash value of k, and calculate the subscript index t ...

The second day of Xiaobai's basic java study 1, Notes As the saying goes: if the foundation is not strong, the earth will shake and the mountains will shake. 1. Comment, identifier, keyword notes When the amount of code is small, we can still understand the code we write, but once the project structure is complex, we need comments.Comments ...

1, Explanation of global component definition and reusability 01,Understand the concept of components with a picture Let's take a look at an official picture given by Vue3. Through the picture, we can clearly understand some clues of what components in Vue are. The left side of the figure is a web page, which is divided into header, left m ...

Bucket log audit outline design specification reference resources Alibaba cloud - log rollover 1. Source code analysis of Minio event notification module MinIO bucket notification GuideAmazon S3 Event NotificationsAlibaba cloud - event notification 1. Event notification module NotificationSys // NotificationSys - notification system. ...

1, Overview of Pod scheduling strategy The biggest problem to be solved in the container choreography function in Kubernetes is to schedule the created Pod to the Node. Then, how does the Pod decide which Node to schedule to. This involves the Kube scheduler component introduced when we installed the Kubernetes cluster earlier. Kube scheduler ...

Related links (1)Question 1 complete idea and Python implementation code download (2)Question 2: complete idea and Python implementation code download subject Question 1: Based on question 2 of the preliminary round, if you need to accurately predict the transaction cycle of vehicles, what method will you adopt for modeling? Please use ...

4. Performance analysis 4.1 common performance bottlenecks of MySQL ① CPU: when the CPU runs at full load, it usually occurs when the data is loaded into the memory or read from the disk; ② IO: the disk IO bottleneck occurs when the loaded data is much larger than the memory capacity; ③ Server hardware bottleneck: check the performance an ...

1. JSP overview 1.1. What is jsp? (what) JSP page is essentially a Servlet program. When visiting JSP page for the first time (after running Tomcat server, enter the path in the browser address bar), Tomcat server will translate this JSP page into a Java source file and compile it into class bytecode file. *So jsp is a java class in a ...

In daily development, there are many similar operations of reducing inventory, such as commodity inventory in e-commerce system, prize inventory in lottery system, etc. Solution Using mysql database, use a field to store inventory, and update this field every time you deduct inventory. The database is still used, but the inventory is layere ...