Programmer Think

1, What is singleton mode Singleton Pattern is one of the simplest design patterns in Java. This type of design pattern is a creation pattern, which provides the best way to create objects. This pattern involves a single class that is responsible for creating its own objects while ensuring that only a single object is created. This class prov ...

1, Foreword Recently, the company's project is ready to start reconstruction, and the framework is selected as Spring Boot. This article mainly records the process of building Spring Boot Maven multi module project in IDEA. This article can be said to be a complete dry goods of practical projects. Interested friends can continue to read it Al ...

1. Illustrating data structures 1. Infrastructure (1) Arrays Arrays are essentially a continuous block of memory that holds something in common. Array elements can be quickly positioned and manipulated through array subscripts. However, its insertion and deletion operations are inconvenient, requiring all elements following the insertio ...

introduction In web development, function is the cornerstone. In addition to function, peacekeeping and protection are the top priority. Because during the operation of the website, the business may be abnormal due to the sudden traffic, and may also be maliciously attacked by othersTherefore, our interface needs to limit the traffic. Commonly ...

👨‍🎓 Blogger homepage: Java tribute dust collection Miraitow 📆 Creation time: 🌴 February 7, 2022 20:23-2:03 🌴 📒 Content introduction: source code analysis of common collections. Later, there may be collections such as ArrayList 📚 Reference: [Xiao Liu speaks source code] ⏳ In short, I encourage you to watch the officials and try new t ...

A room with headlights on on a cloudy day catalogue Option 1 The following statement is correct The total number of handshakes generated by establishing and closing a tcp is What are the similarities between TCP protocol and UDP protocol in computer networks Given the port number bound to a process, the command to query the process is ...

1. What are the basic types of JavaScript? What are the reference types? What is the difference between null and undefined? Data type: Basic data types: Number, String, Boolean, undefined, null Reference data types: Function, Object, Array difference: undefined: indicates the value when the variable is declared but not initialized Null: i ...

In the previous article, I have published common interview questions. Here I took some time to sort out the corresponding answers. Due to my limited personal ability, they may not be in place. If there are unreasonable answers, please give me some advice. Thank you here.   This paper mainly describes the basic content serialization, reflectio ...

978 · basic calculator Implement a basic calculator to calculate a simple expression. The expression string may contain left parenthesis' ('and right parenthesis'), plus sign' + 'or minus sign' - ', non negative integer and space'. The expression given is always reasonable. Learned the usage of eval. An error was encountered: E ...

Question 1: What are the differences between Iterator and Enumeration interfaces? The version of traversing the interface of jdmap1 and ArrayList.2 is supported. Iterator supports the fail fast mechanism. When multiple threads operate on the contents of the same collection, a fail fast event may be generated. The Iterator has three method int ...