Programmer Think

The main task of Task 2 is data exploratory analysis 1, EDA introduction and purpose Introduction: EDA (exploratory data analysis) refers to a data analysis method that explores the existing data under as few a priori assumptions as possible and explores the structure and law of the data by means of drawing, index, equation fitting, calculat ...

Square root of x int mySqrt(int x) { int low = 0, mid = 0, high = x; if (x < 0) return -1; if (x <= 1) return x; while(low + 1 < high) { mid = low + (high - low) / 2; if (x / mid < mid) high = mid; else low = mid; } return low; } Ge ...

**[JAVA] learning notes * * (12.04) Code execution process The development cycle of Java program includes compilation, download, interpretation and execution. 1. Write java code first. 2. Compile and compile Java code into bytecode (. class file). 3. Bytecode is loaded into memory. 4. Entering the virtual machine is executed by the interpr ...

1002 write this number c + + number and string conversion Method 1: use stringstream: add header file #include Number to string #include <string> #include <sstream> int main(){ double a = 123.32; string res; stringstream ss; //Define stream ss ss << a; //Convert number a to stream ...

Create and start a Netty server How do I create and start a Netty server? Start a netty server and listen on port 8888 with the following code. public class MyNettyServer { private static Logger logger = LogManager.getLogger(MyNettyServer.class); public static void main(String[] args) throws InterruptedException { NioEven ...

What is AJAX:Ajax (asynchronous JavaScript and XML) asynchronous JavaScript and XML. Ajax can make web pages update asynchronously by exchanging a small amount of data with the server in the background. This means that a part of a web page can be updated without reloading the whole web page. Traditional web pages (without Ajax) must reload the ...

target Master the creation method of content providers and be able to create content providers independentlyMaster the steps of using content providers to access other applications, and be able to read the mobile phone address bookMaster the use of content observers, and be able to use content observers to observe the data changes of other ...

How to communicate between parent and child components? The parent component imports the child component through import and registers it in the parent component through the component attribute. Then the child component can be embedded into the parent component in the form of label. Communication through props The child component can receive ...

When developing component libraries or plug-ins, it is often necessary to distinguish between multiple environments to achieve:Various "volume" versions are available: full volume version, simplified version, basic version, etc;Provide various "environment" versions: web version, nodejs version, etc;Various "specificati ...

summary Distributed locking has always been a topic that needs to be focused after the emergence of distributed systems. When it comes to distributed systems, we have to think of distributed locks and distributed transactions. In the past single application scenarios, using the built-in lock of jvm can solve the thread safety problem, but ...