Programmer Think

Four rules Let's first understand the following four rules for reference types: 1. Reference types have object properties, which can be extended freely. 2. Reference types have an implicit prototype__ proto__ Property. The property value is an ordinary object. 3. Reference types, implicit prototypes__ proto__ The property value of points t ...

background Taking the microservice system built by SpringCloud as an example, using the front-end and back-end separated architecture, each system will provide some general request parameters, such as system version information and IMEI information on the mobile end, IP information on the Web end, browser version information, etc. these parame ...

Advance preparation For the smooth development of the story, we first create a table and insert some records into the table. The following is the SQL statement: CREATE TABLE hero ( number INT, name VARCHAR(100), country varchar(100), PRIMARY KEY (number), KEY idx_name (name) ) Engine=InnoDB CHARSET=utf8; INSERT INTO hero ...

Introduction to current limiting Now when it comes to high availability systems, we will talk about high availability protection methods: caching, degradation and current limiting. This blog will mainly talk about current limiting. Current limit is the abbreviation of Rate Limit, which means that only specified events are allowed to enter the ...

**MQ, also known as Message Queue, is a middleware for asynchronous communication** It can be understood as the post office. The sender delivers the message to the post office, and then the post office helps us send it to the specific message receiver (consumer). We don't need to care about the specific sending process and time, and it won't in ...

High frequency algorithm interview questions ★★★ bubble sorting Compare two from the start position for n rounds Basic Edition function bubbleSort (arr) { // Execute round i + 1 for (let i = 0; i < arr.length; i++) { for (let j = 0; j < arr.length - 1; j++) { // Compare the former with the latter in pairs if (arr[j] & ...

Detailed explanation of Nginx/OpenResty Nginx (or OpenResty) has been used in production scenarios to an amazing extent. No matter what the actual market occupation rate is, according to the projects experienced by the author in recent years, the utilization rate is 100%. However, a large number of developers around the author still know the ...

1. What is a JVM? What does the java virtual machine include? JVM memory model? A: JVM:java virtual machine is a virtual computer implemented by hardware or software java virtual machine includes: stack, processor and register Program counter: the type indicator of bytecode executed by the current thread. It is used to record the address of ...

1. Differences among NiO, BIO and AIO BIO: the traditional network communication model is BIO, synchronous blocking IO In fact, the server creates a ServerSocket, and then the client uses a Socket to connect to the ServerSocket of the server. When the ServerSocket receives a connection request, it creates a Socket and a thread to communicate ...

I Interview questions and analysis 1. Today's interview question How to implement row to column conversion in Java? How to realize column to row conversion? 2. Topic analysis The topic that Yige explained to you today is somewhat different from the previous topic. So what's the difference? Let's carefully recall the previous intervie ...