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** Can RFID tags be read through the NFC function of the mobile phone ** Some labels can be read RFID tags have many types: according to different frequencies, they can be divided into low frequency (LF), high frequency (HF), ultra-high frequency (UHF) and microwave (MW) electronic tags. 1. The typical working frequency of high-frequency c ...

1, Agent mode ①. concept For some reason, an object needs to be provided with a proxy to control access to the object. At this time, the access object is not suitable or cannot directly reference the target object. The proxy object acts as the intermediary between the access object and the target object ②. structure Abstract Subject c ...

preface The content of this article mainly refers to the design mode (2nd Edition) edited by Liu Wei, and also combines some of my own thinking and understanding, hoping to help you. This article explains the command mode, which enables the request sender and the request receiver to eliminate the coupling between each other and make t ...

Wechat H5 payment within App Let's take a look at the demonstration effect first I want to use the sdk of yungouos platform for wechat H5 payment, but I can't find the Demo developed in AS, so I have to think about it myself. Since I was also the first time to make wechat payment, I encountered many problems and consulted a lot of materials ...

The beginning of Dr. Yan Hong's Book JAVA and patterns describes the Facade pattern as follows: Facade mode is the structure mode of object. The communication between external and a subsystem must be carried out through a unified facade object. Provide a higher-level interface mode to make it easier to use.   Examples of hospitals ...

[Introduction] Take Vs2019 for example, when you click Run Program, the key will change, and if you add an error box, it won't change anywhere else. This is typical Observer mode. 1. Observer Mode Observer Pattern: Defines a one-to-many dependency between objects that is notified and automatically updated whenever an object's state chang ...

Smart Life project requirements We bought a set of smart appliances, including lights, fans, refrigerators and washing machines. We can control the work of these appliances as long as we install apps on our mobile phones.These smart appliances come from different manufacturers. We don't want to install an app for each kind of home appliance an ...

background In the development process of using fluent in depth, we encountered serious business code coupling and poor code maintainability, such as mud. We need a unified application framework to get rid of the current development dilemma, which is also a virgin land vacant in the field of fluent. Fish Redux is an upper application framework ...

What is reflection Java reflection mechanism is to know all the properties and methods of any class in the running state; Any method of any object can be called; This function of dynamically obtaining and dynamically calling object methods is called java reflection mechanism. Functions provided by java reflection mechanism: Determine the ...

2.1.1. Using coprocessing to decompose complex logic Processing asynchronous tasks with a collaborative process: when you encounter some program requirements that need asynchronous processing, you can use a collaborative process to implement themAdvantages of using collaborative process: simple and easy to implementExample: using coprocessor ...