Programmer Think

First, inheritance Inheritance in Java uses the keyword extends, which is slightly different from the syntax of C#. 1. Subclass constructor java automatically inserts calls to the parent constructor in the constructor of the child class, that is, the initialization of the parent class is completed before the child class can access the pa ...

There are often situations where cmd is needed in a folder, such as running a script. Here are several ways to do this. Take the following directory operations as an example: Mode 1: Common cd commands The cd command is the most common way we use it: Win+R opens the cmd window, which is displayed as follows by default (non-administrator mo ...

#0 Preface In the last article, we learned about the basic use of Constraint Layout. If you don't know Constraint Layout, go and learn about it. Guidelines for Constraint Layout Use https://www.jianshu.com/p/958887ed4f5f This number has also pushed some articles: Learn some new features of Constraint Layout again This article fo ...

Logger Basic Usage brief introduction Simple, pretty and powerful logger for android Simple, powerful and beautifully formatted tools for Android The essence is to encapsulate the Log class provided by the system, and add some partitioning lines to make it easy to find different logs; the information displayed in logca ...

The first two blogs retrieve information about python data analysis in the Label (tab) https://www.cnblogs.com/lyuzt/p/10636501.html ) and visual analysis of the acquired data ( https://www.cnblogs.com/lyuzt/p/10643941.html This time, we use sklearn to make a simple salary forecast for python data analysts with different academic qualifications ...

When using react with react-router for application, you may encounter such a problem. When I transit from the first page to the second page, and then return, I find that the state of the previous page has disappeared, that is, back to the original state. This is more obvious when there are multiple TAB pages or multi-criteria screening on the p ...

Preface   For a professional programmer, Linux-related knowledge is necessary. Text processing is more common, such as formatting the output data we need, which may come from text files or pipe characters, or counting the frequency and total number of data we need in the text.Then awk is worth learning.   text   In Linux, awk, sed, grep are cal ...

This article was first published on my personal blog Click on the link to enter the original text Preface Dagger2 is now a very popular dependency injection framework, currently maintained by Google, and has 12K star on Github. The entry threshold of Dagger 2 is relatively high. It is known that many Android engineers do not know Dagger 2 well ...

EventBus 3.0 Advancement: Complete Analysis of Source Code and Design Patterns Preface In the last article: Preliminary Exploration of EventBus 3.0: Introduction and Full Analysis of Its Use In this article, the author introduces the usage of EventBus 3.0 for you, and I believe you are familiar with the us ...

Your problem lies mainly in not reading much but thinking too much.- Yang Jiang That's right. I must read more!!! Head->1->2>1-->3->3->5->7->6>7->8, delete the duplicates and make them head->1->2->5->7->6->8. Today's title is the same as yesterday's. Yesterday we successfully comp ...