Linux password modification is a solution to the problem of prompting "passwd: identifying token operation errors"

This morning, I suddenly wanted to change the password of an ordinary user. When root logged in and typed in the password command, I found that it prompted "passwd: authentication token operation error". [root@Geeklp-Administrator ~]# passwd Geeklp Change user Geeklp's password. New password: Invalid passw ...

Posted by andrewmcgibbon on Sat, 18 May 2019 17:56:05 +0200

Neural Network Foundation and Keras Introduction

Definition of Neural Network In the field of machine learning and cognitive science, artificial neural network (ANN) is a mathematical model or computational model which imitates the structure and function of biological neural network (animal central nervous system, especially brain), and is used to estimate or approximate functions. In order ...

Posted by Dev on Sat, 18 May 2019 17:24:39 +0200

Andriod RX+Retrofit Basic Learning and Simple Encapsulation

Recently, new work has been added. Android products use RX+retrofit as the framework of network interaction, which has never been used before, and only make up for it by themselves. Here I share with you the results of my study, which is also convenient for me to review in the future. There are many similar articles, and the encaps ...

Posted by markjia on Sat, 18 May 2019 14:09:08 +0200

Encapsulation of OkHttp (parameters are all submitted using Json)

OkHttp believes it's not unfamiliar. Android is a useful framework for web requests. GitHub has more than 2 weeks of Start s on it and Square is one of Jake Wharton's masterpieces (Jake Wharton left Square to join Google), where he worships God for three seconds... I encapsulated OkHttp twice as needed for the project because, ...

Posted by KyleVA on Sat, 18 May 2019 09:54:33 +0200

Analysis of Superdetailed Guava Rate Limiter Current Limiting Principle

Current limiting is one of the three powerful tools to protect high concurrent systems, and the other two are cache and degradation. Current limitation is used to limit concurrency and requests in many scenarios, such as second-kill snap-up, protection of their own systems and downstream systems from being overwhelmed by huge traff ...

Posted by Tux-e-do on Sat, 18 May 2019 05:21:07 +0200

Wechat Sharing Integration Strategy

A complete Android Wechat Sharing Integration Strategy Preparations before development 1. Log on to Wechat Open Platform to fill in your own developer information and wait for approval for the next step. Open Platform Address: https://open.weixin.qq.com/ 2. Create your own APP on the open platform (under the account ...

Posted by alpha_juno on Sat, 18 May 2019 04:30:51 +0200

Twelve lessons in writing high-quality jQuery code

1. Reference jQuery correctly Try to introduce jQuery before the end of the body, not in the head. Introduce jQuery with a third-party CDN, and be aware that when problems arise with using a third-party CDN, local jQuery files should be introduced. If a script file is introduced before </body>, you do not need to write document.read bec ...

Posted by cbailster on Sat, 18 May 2019 02:31:41 +0200

golang foundation (33) exception handling

golang_real.jpg Beginners tend to ignore exception handling in the program, thinking that the program is always running in a cared-for environment, without any wind or rain, because we are the most knowledgeable people of our program. So we know what he likes, what he can eat and what he can't eat. But one day he returned to ...

Posted by spartan789 on Fri, 17 May 2019 14:49:32 +0200

Detailed Source Analysis of Android Volley Framework

Preface We are familiar with Android network programming, but we have to ask, do we really know Volley? How is Volley implemented internally? Why can a few lines of code quickly build a network request? We should not only know what it is, but also know why it is. For this purpose, this paper mainly describes the source code of ...

Posted by marker5a on Thu, 16 May 2019 13:56:19 +0200

Java Foundation - Handle

The role of Handler: When we need to deal with time-consuming operations (such as accessing the network, database operations) in sub-threads, and when the time-consuming operations are completed, we need to update the UI, which requires the use of Handler, because sub-threads can not do the operation of updating the U ...

Posted by jdnet on Thu, 16 May 2019 01:07:54 +0200