Programmer Group

2021SC@SDUSC public class CabinetService extends Service {} Create a CabinetService class, which inherits from the Service class The specific contents of the class are analyzed as follows: private String TAG = CabinetService.class.getSimpleName(); public class LocalBinder extends Binder { public CabinetService getService() { ...

The new features of Java 8 are mainly Lambda expressions and streams. When streams and Lambda expressions are used together, the code can become concise and easy to read because of the characteristics of stream declarative processing of data sets1 how to simplify code flowIf there is a requirement, you need to process the dishes queried in the ...

vue When creating a vue instance, an object options is passed in el:string/htmlelement: determines which DOM the vue instance will manage data:object/function: the data object corresponding to the vue instance (there must be a function in the component) methods:{[key:string]:function} function: define some methods belonging to vue, which ...

Write in front After nearly two months, I finally completed the development of more than ten interfaces of a project site to the site SIT. In this process, I deeply realized the importance of adding logs (I never wanted to add logs before, but this time it really taught me a lesson). Take an example of the credit occupation interfa ...

Today, let's learn about the map data type in golang, simply summarize the basic syntax and usage scenarios, and don't go deep into the bottom. What is the map type? Having done PHP, it is no stranger to the data type of array. Arrays in PHP are divided into index arrays and associative arrays. For example, the following code:// Index array [th ...

preface "Ftrace is a tracking tool built into the Linux kernel. Many Linux distributions have enabled various configurations of ftrace in the latest versions. One of the benefits of ftrace to Linux is that it can view what happens inside the kernel, better find the exact cause of the crash, and help developers create the right solution ...

1. Preface For beginners of recursion, recursion is undoubtedly difficult to understand. This series aims to analyze the recursion used in common algorithms to a certain extent, and summarize its recursion model while learning these algorithms. In order to deepen the understanding of recursion, at the same time, when we master a variety of ...

Dart encoding specification: handle null correctlyprefaceIn Dart coding, we often encounter situations where we need to deal with null. After the introduction of null safety in Dart version 2.12, there is a new specification for null processing. For the null safety feature, you can read another article: Upgrade stepping pit and talk about Dart' ...

  import com.bean.Yyds1 import org.apache.spark.sql.SparkSession object TestReadCSV { def main(args: Array[String]): Unit = { val spark = SparkSession.builder() .appName("CSV Reader") .master("local") .getOrCreate() /** * Parameters can be either strings or specific types, such as boolean * delimiter Separat ...

Method function There are functions when you come into contact with the first program in Java. The main function is a function that specifies the writing method in Java: the main function is usually written in an open class, and the code in the main function is automatically generated when executing a java program. Definition of function: Fu ...