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Character operation Encoding and decoding Encoding is to convert characters into bytes, while decoding is to recombine bytes into characters. If the encoding and encoding process use different encoding methods, there will be garbled code. In GBK coding, Chinese characters occupy 2 bytes and English characters occupy 1 byte;In UTF-8 coding, ...

In depth understanding of synchronized (Part 1) Thread safety problems caused by Java shared memory model public class SyncDemo { private static int count = 0; public static void increment(){ count++; } public static void decrement(){ count--; } public static void main(String[] args) throws InterruptedException { Thread t1 = new T ...

This article introducesWe all know that the Spring Boot project consists of starters, such as web starters, redis starters and so on.By introducing the corresponding starter through maven, we can perfectly use the integrated spring mvc or redis without configurationSo how do we customize a starter?This article will show you how to use the auto ...

1706. Where does the ball meet Problem solution Title Source: 1706. Where does the ball meet 2022.02.24 one question per day Daily question column address: LeetCode daily problem solution is being updated ❤️💕 Today's topic is easier. After solving the problem, I'll pack my bags and go back to school tomorrow. I hope it's easy tomorrow, heh ...

Hello, I'm glacier~~ This article is pure dry goods. It deeply analyzes the Callable interface from the perspective of source code. I hope you can step down, open your IDE, and follow the article to see the source code. I believe you will gain a lot. 1. Introduction to callable interface The Callable interface is jdk1 5 new generic interface ...

In the process of developing program system, we often need to consider the problem of system security, Like this, it's like your database is running naked, isn't it? Maybe someone quietly deleted the database and let you run away? Therefore, the plaintext password cannot appear in the configuration file. Next, I will give you a detailed in ...

JavaSE Basics Java comments public class Helloworld { public static void main(String[] args) { System.out.println("hellowprld"); //Output a Hellowprld /*I'm a multiline comment */ /** * * I'm a document comment */ } } identifier public class Demo01 { public ...

Java process control Scanner object We use the Scanner class to get the user's input Basic syntax: Scanner s=new Scanner(System.in); Get the input string through the next() and nextLine() methods of Scanner class. Before reading, we generally need to use hasNext() and hasNextLine() to judge whether there is still input data Scanner object ...

catalogue 1, Class definition 2, this reference 3, Construction method and object initialization 1. Construction method 2. Object initialization 4, Encapsulation 5, Package 1. Concept of package 2. Import classes in package 3. Custom package 4. Common packages 6, static member 1. static modifier member variable 2. Static member me ...

Ioc overview Ioc(Inversion Of Control) is translated as control inversion First, make it clear that the control without inversion is "active control" Active control: all the codes we wrote before are active control, which means that we can instantiate whatever objects are needed during the running of the programInversion of control ...