Programmer Group

Advanced controls Advanced control steps 3.1 obtaining data 3.2 create adapter Array adapter Simple adapter 3.3 binding adapter Differences between high-level controls and low-level controls: **Use adapter or not** 1: Auto prompt box 1.AutoCompleteTextView Case 1: automatic completion of data (array ...

Brief introduction to life cycle method startService() Role: start Service service After manually calling startService(), internal methods are automatically called: onCreate(), onStartCommand() If a service is started multiple times by startService, onCreate() will only call once onStartCommand() calls = startService() calls ...

Spring does not guarantee thread safety of bean s.The bean s in the default spring container are singleton. When there is a race condition in a single case, there is a thread safety problem. As the following example Counting class package constxiong.interview.threadsafe; /** * Counting class * @author ConstXiong * @date 2019-07-16 1 ...

1. Configuration in xml bean declaration and registration < bean > node register bean Factory bean parameter of < bean > node refers to factory bean, and factory method parameter specifies factory method   bean injection < property > nodes are injected in set mode < constructor Arg > node injection with construc ...

1. Basic introduction of agent mode Proxy mode provides a surrogate for an object to control its access.That is, the target object is accessed through the proxy mode.The advantage of this is that on the basis of the implementation of the target object, additional functional operations can be enhanced, that is, to extend the function of the ta ...

background Business Split creates a new project that wants to reference a new technology stack (using the springcloud family bucket, temporarily unable to upgrade to springboot 2.0 for project reasons, so feign is used here for rpc), but it still uses the previous RPC interface (the original RPC framework is thrift) Problem occurs when there ...

3 Minutes Society.NET Core Jwt Policy Authorization Certification I. Preface # Hello, I'm back. A few days ago I talked about the simplest case of Jwt authentication, but it's not powerful enough for real projects. Yes, in a real complex and demanding customer, we're at a loss. Now we need to make the certification authorization more complex a ...

I want to draw a line in the middle of the layout and use it as a separator for other items such as TextView. Is there a good widget. I really don't want to use images because it's hard to match other components to it. I hope it can also be relatively positioned. Thank you #1 building I usually use this code to add horizontal lines: &l ...

1. What is base64 encoding Due to the limitations of some network communication protocols, you must use the window.btoa() method to encode the original data before sending. The receiver uses the method equivalent to window.atob() to decode the received base64 data and get the original data. For example, some data containing co ...

Compile reserved method parameter name javac document javac doc -parameters Stores formal parameter names of constructors and methods in the generated class file so that the method java.lang.reflect.Executable.getParameters from the Reflection API can retrieve them. Get a list of parameters supported by dynamic compilation The problem o ...