Design Mode Software Development Original Open Close Principle and Dependency Inverted Principle

Open and Close Principle Definition The so-called open-close principle is that a software entity such as classes, modules, and functions should be open to extensions and closed to modifications.Emphasizes building a framework with abstraction to achieve expanded detail. It has the advantage of improving the reusability and maintainability of th ...

Added by jonskinny12 on Sun, 19 May 2019 00:02:12 +0300

Multithreaded disconnected continuation function written without a third-party framework

1. Background Recently, we need a disconnect continuation function, but feel that some frames are not suitable, so we write a multi-threaded disconnect continuation function based on principle Support technology sharing, but please indicate the source when copying and forwarding my blog. Thank you https://my.oschina.net/grkj/blog/2907188 2. Pe ...

Added by sarmad_m_azad on Sat, 18 May 2019 20:33:14 +0300

Guidelines for Taifang Block Chain Development from Zero

Preface In the last article, we introduced Geth installation, and today we describe how to deploy smart contracts.If you haven't read the last introductory article yet, I suggest you read the last one first Guidelines for Taifang Block Chain Development from Zero .Deploying smart contracts first requires a contract file written by solidity and ...

Added by mastercjb on Sat, 18 May 2019 15:57:28 +0300

Java Lab 8, Exceptions

I. Experimental purposes 1. Master the compilation of custom exception classes; 2. Master using try-catch statements to handle exceptions. II. Contents and requirements of the experiment The station inspects the equipment of dangerous goods and warns if dangerous goods are found. Programming simulation equipment to de ...

Added by skiingguru1611 on Sat, 18 May 2019 07:08:52 +0300

Python Interesting | Emotional Analysis of Chinese Texts

Preface Previously, I have talked about the path of python machine learning. This time, Luo Luopan takes you to complete a machine learning project of Chinese text sentiment analysis. Today's process is as follows: Data Situation and Processing Data situation The data here are for the comments of the public (provided ...

Added by patrickrock on Sat, 18 May 2019 01:57:03 +0300

Shell Initial (2) Shell Operator

Shell Initial (2) Shell Operator Shell basic operator Shell, like other programming languages, supports a variety of operators, including: Arithmetic operator Relational operator Boolean operator String operator Native bash does not support simple mathematical operations, but can be implemented by other commands, such as awk and expr, e ...

Added by messer on Sat, 18 May 2019 00:24:05 +0300

3/7 of the Java Foundation in 7 days

API overview What is API? API (Application Programming lnterface), application programming interface. The so-called API is the value of many classes, many methods, JDK gives us a lot of ready-made classes, we can use them directly, these classes are API. API Official Documentation The Use of Scanner Classes in Several Common API s Guide bag B ...

Added by tbare on Sat, 18 May 2019 00:14:56 +0300

Overview of Object-Oriented Programming Day 24

Three Questions in Life What is an object The real thing with certain characteristics and behaviors is the object, everything is the object. What is a class A combination of a series of objects with the same characteristics and behavior is called a class.In programming, only classes can have objects. 1. What is Object OrientedObject- ...

Added by salasilm on Fri, 17 May 2019 23:59:20 +0300

A thorough understanding of the 0-1 knapsack problem

Reprinted from: https://blog.csdn.net/chanmufeng/article/details/82955730 0-1 knapsack problem The 0-1 knapsack problem is that each item can only be used once. Recursive Method public class KnapSack01 { /** * Recursive Function for Solving Knapsack Problem * * @param w Weight Array of Items * ...

Added by pelleas1022 on Fri, 17 May 2019 23:49:38 +0300

A week's study

This week's lessons are: exceptions, collections, IO streams, multithreading. abnormal 1. I personally understand that exceptions are abnormal events that occur in the process of running a program, which will end the running program.2.Java exception handling: Java has the ability to handle exceptions. Java has five keywords to handle exceptions ...

Added by hannnndy on Fri, 17 May 2019 16:45:28 +0300