Programmer Group

1. What is the difference between synchronous and asynchronous? Synchronization means that when a function call is issued, the call will not return or continue to perform subsequent operations until the result is obtained. Asynchrony is relative to synchronization. When an asynchronous procedure call is issued, the caller can proceed with sub ...

As a programmer, if you like to output technical articles, you must have had the idea of building a personal blog website. After comparing a lot of blog frameworks, I found that the blog website built with the theme of Hexo + Hexo theme matrix not only has a beautiful interface, but also has powerful functions. Today, I will take you to build a ...

No, let's start! Guiding language After getting familiar with HashMap, let's take a look at TreeMap and LinkedHashMap in this section to see how TreeMap is sorted by key and how LinkedHashMap is accessed by two strategies. 1. Knowledge reserve Before understanding TreeMap, let's take a look at the two sorting methods in daily work as the ba ...

subject Given a string, write a function to determine whether it is one of the permutations of a palindrome string. Palindrome strings refer to words or phrases with the same positive and negative directions. Arrangement refers to the rearrangement of letters. Palindrome strings are not necessarily words in the dictionary. Example ...

1. Why do you have to override the hashcode method when you override the equals method? equals() and hashCode() are both built-in methods in the Object class. The native equals() uses = = to compare the memory addresses of the two objects. hashCode is a native method. Different objects get different hashcodes. A subclass of Object, such as St ...

Chapter 1 Java overview 1.1 Java history Java was born in SUN (Stanford University Network), and SUN was acquired by Oracle (Oracle) in 2009. The father of Java is James gosling. JDK1.0 was released in 1996. The latest version is java 12. We learned Java 8. 1.2 main features of Java language Feature 1: object oriented Two basic concepts ...

Why SpringBoot Because currently developing WEB applications, Spring Boot is the fastest and most popular way to start Spring projects. No matter what kind of application we want to build, it can let us start and run as soon as possible. There is basically no need to configure anything in the early stage, and the built-in application server al ...

preface In previous classes, we have learned about the whole android program in detail, from Startup to painting. From this, we have involved the Canvas drawing board and our Paint control color style brush. Then we will not explain in detail in the previous basic chapter. Those API s have been published in the previous basic chapter, I also a ...

If you don't understand it yet, look at the simplified code below: // Article Error Code🙅Simplification for (i in 0..100) { // Simulate Generated Data flow<Int> { emit(i) }.debounce(500) // This is an invalid limit because emit of flow only executes once... .collect { println("----------------- ...

public boolean clipRect(float left, float top, float right, float bottom) public boolean clipRect(int left, int top, int right, int bottom) public boolean clipRect(@NonNull Rect rect) public boolean clipRect(@NonNull RectF rect) 2,clipOutPath public boolean clipOutPath(@NonNull Path path) Description: only the canvas area outside the pat ...