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1. Why do we need packaging classes? What is the purpose of the packaging class? A: Because the java language is object-oriented, but the basic data type in java is not object-oriented. In practice, it is often necessary to convert the basic data into objects for easy operation. Effect: 1. As a class type corresponding to the basic data type, i ...

prefaceThis is one of my series of articles on basic JavaScript, which mainly records type conversion, equality judgment and operator priority in JavaScript. At the end of the article, some common type conversion interview questions are prepared. After reading this article, I believe these questions are so easy for you. The daily blog is record ...

Job interviews are not entirely predictable, but we still often see common thorny problems. Let's take a look at 10 of them, which often appear in interviews. "I am an old programmer who has been engaged in Web front-end development for 6 years. At the beginning of this year, I spent a month sorting out a full set of Web front-end trai ...

catalogue Importance of data structures and algorithms Relationship between data structure and algorithm Linear structure and nonlinear structure Sparse arrays and queues Sparse array queue Importance of data structures and algorithms Algorithms are the soul of programs. Excellent programs can still maintain high-speed computing whe ...

JOOQ framework provides a language based on generated entities. Using this language, you can create compile time safe queries. JOOQ can generate dialects for many databases. It also cleans up boilerplate code, such as closing connections. 1. `UserRecord user = newUserRecord();` 2. `user.setId(1);` 3. `user.setName("Peter");` 4. `Result ...

I Interview questions and analysis 1. Today's interview question What is the underlying principle of ConcurrentHashMap? Do you know how concurrent HashMap is expanded? ....... 2. Topic analysis In the previous four articles, Yige introduced the general functions and features of ConcurrentHashMap, the underlying data structure of Co ...

prefaceHello, I'm Lin Sanxin. As you know, this rookie usually writes more basic articles. I always believe in two sentencesSpeak the most difficult knowledge in the most easy to understand wordsFoundation is the premise of advancedIn fact, Vue3 has been out for a long time and may be used by most companies. However, what is better about Vue3 t ...

The class parameter here is the interface type of the extension point, and each loader needs to bind an extension point type. The loader is then fetched from the cache first, and a loader is initialized and cached before being fetched. When initializing a private constructor, we need to be aware of the objectFactory variable, which is probably ...

What are the built-in objects of jsp? What are the functions? What are the methods? How to use JavaBean s in JSP? Common instructions for JSP Four ranges of jsp? jsp scope from large to small What are the functions of filters? Filter usage? (uniformly encode the requests of the client and authenticate the client) How to realize the requ ...

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