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catalogue 1, IO stream 1. Classification of IO streams: 2. Byte input stream Construction method of FileInputStream 3. Byte buffer stream Encryption and decoding: 4. Character stream Classification of character stream Character output stream Construction method of OutputStreamWriter Method for OutputStreamWriter to write data The di ...

ThreadFactory Where do the threads in the thread pool come from? It's threadvector public interface ThreadFactory { Thread newThread(Runnable r); } There is an interface in Threadfactory. This method will be called when a thread needs to be created in the thread pool. You can also customize the thread factory public class Threadfac ...

2022Java learning notes 33 (object-oriented enhancement: inheritance, @ Override rewrite annotation) 1, What is inheritance 1. Inheritance is a relationship between classes 2. Multiple classes inherit a single class, and multiple classes can use the properties and behaviors of a single class 3. Multiple classes are called subclasses (derived c ...

Basic chapter Key points of basic part: algorithm, data structure and basic design mode 1. Binary search requirement Be able to describe the binary search algorithm in your own languageAble to write binary search codeBe able to answer some changed test methods Algorithm description Premise: there is A sorted array A (assuming it is ...

1. Basic concepts program A program is a set of instructions written in a certain language to complete a specific task. That is, a piece of static code (not yet running), static object. process Process is an execution process of a program, that is, the program runs, loads into memory, and occupies cpu resources. This is a dynamic process ...

Introduction to Native payment Reference documents: https://pay.weixin.qq.com/wiki/doc/apiv3/open/pay/chapter2_7_0.shtml Native payment refers to the mode in which the merchant system generates a payment QR code according to the wechat payment agreement, and the user uses wechat to "scan" to complete the payment. Application scenar ...

I. API public void interrupt() public static boolean interrupted() public boolean isInterrupted() II. Description of interrupt 1. Introduction The call of the following methods will make the current thread enter the blocking state, and the blocking can be interrupted by calling the interrupt method of the current thread Object ...

Controls the type of inversion Inversion of control (IOC) aims to provide a simpler mechanism to set the dependencies of components and manage them throughout the life cycle. Generally, control inversion can be divided into two subtypes: dependency injection (DI) and dependency lookup (DL). These subtypes can be further decomposed into the s ...

I always think of beginners in my spare time java The basics of learning, However, it seems that yesterday's basic knowledge sometimes can't remember its principle and knowledge points. So review the summary notes again. Encourage each other!!! At the same time, find the feeling of learning!!! 1, Introduction to Java   Java is betwe ...

How does Spring Security store user data into the database? Up to now, we haven't connected to the database. In real projects, in most cases, we design our own permission database. However, Spring Security also provides us with a permission database designed by itself. Let's see what's going on first! Let's learn this simple one first, and the ...