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After working for many years, I found that there are many tool class libraries that can greatly simplify the amount of code and improve development efficiency, but junior developers don't know. These class libraries have long become the industry standard class libraries, and they are also used in large companies. If someone told me to use these ...

We introduced how to call the construction method of the parent class under inheritance. How to call the method of the parent class under multiple inheritance? Although we need to be careful when using multiple inheritance, multiple inheritance can be seen everywhere in actual project development. Therefore, it is necessary to understand the me ...

preface A powerful framework requires a variety of packages. When we dive into it, it is easy to be confused by all kinds of jumps, design patterns, packaging, etc. in the source code; In this case, we can only understand the general process, but it is easy to forget. Why? Because we haven't really understood it! We don't turn it into our k ...

4. Special operation flow 4.1 standard I / O flow There are two static member variables in the System class: public static final InputStream in: standard input stream ​ Typically, the stream corresponds to keyboard input or another input source specified by the host environment or the user public static final PrintStream out: standard ou ...

Recently, I learned PyQt5 programming and encountered a problem, which is the cleaning of QThreadPool. Specifically, I sometimes need to stop the execution of all threads in a QThreadPool and do the necessary cleaning. Sometimes there are two main scenarios here: because the new input QThreadPool needs to be cleaned up and start with the new in ...

The child previewed the data structure course in the summer vacation and wrote an exercise. Let me comment. Let's take a look at the problems with his code. subject The topic is to write a linear table related data operation algorithm. Specifically, write a book management program. The information content of the book is as follows: code ...

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Related links: [design mode] column: [design mode] column Relevant examples can be downloaded: Examples of common Java design patterns Observer mode Observer Pattern refers to one to many dependencies among multiple objects. When the state of an object changes, all objects that depend on it are notified and automatically updated. This pat ...

Memory visibility Volatile is a lightweight synchronization mechanism provided by Java. It also plays an important role in concurrent programming. Compared with synchronized (usually called heavyweight lock), volatile is more lightweight. Compared with the huge overhead brought by using synchronized, if volatile can be used properly and reason ...

Abstract: This paper describes the mediator pattern in Gof 23 design pattern with an example scenario, and implements it with Quarkus program code. At the same time, it also gives the UML model of the implementation code. Key words: Gof 23 design pattern mediator pattern Quarkus 1 basic knowledge 1.1 standard definition The standard definition ...