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Collections in Java Collection: a storage structure that can dynamically store multiple data. It is a public API provided by Java and exists in Java Util package The architecture of the entire Java collection is as follows: There are two main branches: Collection can only store one value at a time. The specific storage nature is related to ...

#Thread concurrent atomic operation class What is atomicity is that the operation is completed at one time. When operating variables, other threads cannot operate variables, that is, the role of the synchronized synchronization keyword we mentioned earlier. In this section, instead of synchronized, we use the atomic classes in the system API. ...

Spring boot case study: employee addition, deletion, modification and query page (fool teaching) As the saying goes, no matter how many concepts you see, it's better to do a case study. This article will take you to learn and complete a Spring boot case. To learn, we must first find the motivation before we have the perseverance to learn. If ...

1. include & require We know that if an A.php file wants to introduce the classes in the B.php file, it needs to introduce B.php through include / require. This method is not a problem for small projects, but for large projects, it usually contains many public files, such as foo / bar / dog PHP, according to the traditional way, we can imp ...

Two files, cards_main.py and cards_ tools. py. The functions realized include adding business cards, displaying all business cards and querying business cards. General idea: First, edit the main function to determine the functions in the main function. After the file needs to be executed, the menu function show is displayed directly_ Menu fu ...

1. NIO basic introduction Java NIO is synchronous and non blocking. NIO related classes are placed in Java NIO package and sub packages, and many classes of rewriting of the native IO. NIO is buffer oriented or block oriented programming: data is read into a buffer that it will process later and can be moved in the buffer when needed, which i ...

aggregate In java foundation, collections can be roughly divided into the following categories Student object case code (to be used later) public class Student { private String name; private int age; public Student(String name, int age) { this.name = name; this.age = age; } public Student() { } ...

Hello, I'm Mu Mu. I believe that friends who have played reptiles know selenium, an artifact tool for automatic testing. Writing a Python automated script to free your hands is basically a routine operation. If a crawler can't climb, use automated testing. Although selenium has complete documents, it also needs a certain learning cost. F ...

Designing a class can only create objects on the heap The desired effect is that you can't create objects directly on the stack. First of all, cpp needs to call the constructor as long as it creates an object, so first ban the constructor and design the constructor as private. But you can't create it yourself. Therefore, a created interf ...

preface 10 wonderful Python libraries, I was stunned after reading! Let's start happily~ development tool Python version: 3.6.4 Related modules: socket module; textblob module; pygame module; pyqrcode module; pyshorteners module; Google trans module; pendulum module; fabulous module; pywebview module; Environment construction In ...