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Convert the path to a file object, and then calculate how many blocks will be divided: File file = filePath.toFile(); int howManyParts = (int) Math.ceil(file.length() / (double)filePieceSize); Initialize the input / output stream, output error information, and return false，Get current directory: DataInputStream fileReader = n ...

01.C + + type conversion (understand) Static conversion: be used for Class hierarchy Base class (parent class) and Derived class Conversion of pointers or references between (subclasses) Used for conversion between basic data types, such as converting int to char and char to int. The security of this transformation should also be guaranteed ...

static keyword Static keyword, expressed as "static and global". Resources (variables or methods) modified by static can be called directly through the class name without instantiation 1. The resources declared by static can only be initialized once, and the initialization is completed after the whole program is compiled and b ...

Fragmentary knowledge points of design pattern 1. Two themes of design pattern: system reuse and system expansion 2. Design pattern is generally used to solve the problem of different appearance of the same problem 3. Software model is the bridge between software development engineers and software analysis designers 4. Design patterns are d ...

Catalog 1. Members/Instances/Object Variables, Instances (Objects) 1.1 Basic Properties of Objects 1.2 Member variables, instance variables, static variables (class variables), local variables 2. Creation and use of objects 2.1 Definitions of objects and references 2.2 Object Creation 2.3 JVM Three Memories 2.4 Object Access 2.5 Instan ...

Restful Style Introduction WebAPI If a URL returns data instead of HTML, the URL is a web API (web interface) Restful A way to access the web API in the Rest style Restful style ① Different CRUD operations adopt different request modes② The background response data is in JSON format HiddenHttpMethodFilter filter summary The ...

preface Go on [detailed explanation of Spring transactions] - 1 Case demonstration of transaction propagation In this article, let's take a look at the specific use of transactions. It is very simple to start transaction management through Spring. Two methods are supported by default, one is programmatic transaction and the other is decla ...

A previous article briefly introduced MDC. This time, we will have an in-depth understanding of MDC in combination with specific cases and specific problems in production. Introduction to MDC 1. Introduction: MDC (Mapped Diagnostic Context) is a function provided by log4j, logback and log4j2 to facilitate logging under multi-threaded conditi ...

Single and double underscores have their own meanings in Python variable names and method names. Some are only used as conventions to prompt developers; Others have special meaning for Python interpreters. In general, there are several situations: Front single underline:_ varPost single underline: var_Leading double underline:__ varDouble und ...

Say nothing but applause! Applause is the feeling in my heart that blogging every day is really awesome Luckily I don't have any fans, no one rushes, just lazy! Hahaha, write the third article ---------------------------------------------------------------------------------------------------------------------- Chapter V The main p ...