Programmer Think

I. Preface Metaclasses belong to the deep magic of python object-oriented programming. 99% of people don't know the point. In fact, some people who think they understand metaclasses only justify themselves and point to the end. In terms of the control of metaclasses, they are full of flaws and logical confusion. Today I'll take you to deeply u ...

Buffer stream (character type) realizes the copy of text file Using buffered stream can improve the speed of file reading When the character buffer stream reads data, it can read text line by line That is, use the readLine() method in the BufferedReader class readLine(); If there is content in this line, the content of this line wi ...

shared_ptr Heap memory is used very frequently in C++ programming. The application and release of heap memory are managed by the programmer himself. Programmers themselves Managing heap memory improves program efficiency, but overall heap memory management is cumbersome, with the introduction of smart pointers in C++11 Concepts to facilitate h ...

What is ownership Ownership is a unique core concept of Rust. This feature enables Rust to write memory safe programs even without garbage collection mechanism. Therefore, understanding the working mechanism of ownership is very important for learning Rust. Other things related to ownership include borrowing, slicing, and memory layout of data ...

The effect of division Imagine putting a team of people in the playground runway, and the feeling of circulation comes out In order to distinguish between empty queues and full queues, a space needs to be reserved It is equivalent to not allowing end to end connection You'd better draw a picture, otherwise it's easy to get into the pit With cha ...

I am Xiao Hei, a programmer who "lingers" on the Internet Pay attention to the official account of the same name [Xiao Hei Java], more dry cargo content is served first, and more occasional lottery offers. Running water doesn't compete first. It's important to talk In this article, I'll show you how to use Project Lombok as a b ...

Part I HelloWorld 1. The name of the java file must be consistent with the name of the public class 2. A java file can contain multiple classes, but only one public class 3.public static void main(String[] args) is the entry point for all java programs 4. The parameter list in the main method supports multiple writing methods: String[] args ...

Four methods to obtain Class instances Call the properties of the runtime classCall getClass() through the object of the runtime classCalling Class static method: the most commonly used method in forName(String classPath) developmentLoader using class: ClassLoader (just know) package day_12_29; import org.junit.Test; /** * @author ...

**android:divider="#f00" * * color of split line android:dividerHeight = "2dp" the height of the splitter bar **android:cacheColorHint="#0fff" * * when the background image is used in the list, there will be a problem in the drop-down or pull-up: the background image is missing android:scrol ...

1. new an object Creating objects with the keyword new is almost one of the most common operations when writing code, such as: Sheep sheep1 = new Sheep(); Sheep sheep2 = new Sheep( "codesheep", 18, 65.0f ); Through the new method, we can call the parameterless or parameterless constructor of the class to instantiate an object. On the s ...