Programmer Group

Download and install Download address Executable files and dynamic libraries are provided, and Architecture version is used for pure command line. View the currently available video and recording devices Use the following command to view the device list ffmpeg -list_devices true -f dshow -i dummy The device name can be extracted from the outp ...

Several invocation methods: Synchronized blocking call It is called serially, and the response time is the sum of the response time of all services. public class Test { public static void main(String[] args) throws Exception { RpcService rpcService = new RpcService(); HttpService httpService = new HttpService(); //T ...

Function declarations use the fun keyword parameter in the form of name: type to indicate that the name on the left is the type of the parameter on the right, and the type of the return value after the last colon. If the function has no return value, it can be omitted or replaced by Unit. fun double(x: Int): Int { ...

When writing programs or writing test papers, we always encounter classes or data structures defined by ourselves. If we put classes defined by ourselves into arrays such as List, sorting is very troublesome, such as: A Person class is defined below. class Person{ String name; int age; public Person(String name,int age) { t ...

brief introduction In this tutorial, we will first learn about Lambda support in Java 8, especially how to use it to write Comparator s and sort Collection s. First, let's define a simple entity class: public class Human { private String name; private int age; } Simple sorting of lists Prior to Java 8, sorting collections would involve ...

day13 [Stream stream, method reference] primary coverage Stream flow Method reference Teaching objectives Understanding the advantages of flow versus set Understanding the Delayed Execution Characteristics of Flows Streams can be captured through collections, maps, or arrays Ability to master common flow operati ...

One anomaly 1 Concept: An exception is an event that occurs during the execution of a program, affecting the normal execution of the program. Typically, an exception occurs when Python cannot properly handle the program. An exception is a Python object that represents an error. When an exception occurs to a Python script, we ...

In the previous chapter, we introduced heap. In this chapter, we introduced a new tree structure, Segment Tree. Why use segment trees? For a class of problems, we are concerned with line segments (or intervals). The most classic line segment tree problem, interval dyeing: there is a wall, the length is n, each time select a section ...

1 Project Introduction An APP user has been using online dating software to find a suitable date. Although dating websites recommend different people, she doesn't like everyone. After summing up, she found that she had met three types of people: People who don't like it (3) Charming People (2) Charming People (1) An APP user hopes that the cl ...

Referring to ALS, we believe that everyone should not feel strange (not unfamiliar why you click in [cover your face]), it is a kind of collaborative filtering, and is integrated into Spark's MLIB library. This article explains the basic principles of ALS, and hand-in-hand, shoulder-to-shoulder with you to implement this algorithm. Principle ch ...