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1, Foreword In SparseArray detailed explanation and source code analysis, we are familiar with the basic usage, characteristics and implementation principle of SparseArray. There is also an equally important data structure ArrayMap in the toolkit of the Android SDK. Its purpose is to replace HashMap when the amount of data is small, such as hu ...

Source code analysis jdk1 HashMap under 7 We all know that the bottom layer of hashmap version 1.7 is composed of array and linked list. Today, let's analyze the source code ourselves~ It's a little long. I don't talk much nonsense. I'll start the analysis directly~ Attribute declaration //Initialization capacity static final int DE ...

Conversion operator This section introduces three conversion operators of RxJava: map operator, flatMap operator and scan operator. map operator The map operator accepts a conversion function, applies the conversion function to each element in the message flow ejected by Observable, and the converted result pops up from the message flow. The ...

Get geographic location information using HTML5 How to use HTML5 geolocation For example, geoml5 supports more precise location functions on modern handheld devices, especially HTML5. First, we need to check whether the user's device browser supports geographic positioning, and if so, obtain geographic information. Note that this feature may ...

Here comes the squid game. Now let's start. Let's see what level you've passed. Without the aid of IDE, see whether your human flesh compiler can compile the correct results. Scala-like functions fun hello() = { println("Hello, World") } hello() a). Does not compile b). Prints "Hello, World" c). Nothing d). Something el ...

Why did you write this article? I believe many Java developers have used objects like ApiResult to wrap Api return types in projects, which is better than not wrapping anything, but is this really the best way? It is not a best practice to uniformly return ApiResult. We must constantly think about optimization, just like the Rethinking Best P ...

automated testing In order to ensure software quality and reduce repetitive testing, automated testing has been widely used. Automated testing is a testing method that uses specific software to control the testing process and compare the difference between the actual results and the expected results. By automating the test, we can transform ...

function call Syntax: FN call(obj,…args)Function: execute fn, make this obj, and pass the following n parameters to fn Function.prototype.myCall = function (obj, ...args) { if (obj == undefined || obj == null) { obj = globalThis } obj.fn = this let res = obj.fn(...args) delete obj.fn return res } value = 2 let foo = { ...

reference resources Crazy God says springboot Introduction to SpringBoot Review what Spring is The lightweight Java development framework is created to solve the complexity of enterprise application development and simplify development. How does Spring simplify Java development In order to reduce the complexity of Java development, Spr ...

Concept: Redis is an open source high-performance key value pair database developed in C language. features: There is no necessary connection between the dataThe internal uses single thread mechanism to workHigh performanceMulti data type support String type stringList type listHash type MapCollection type SetOrdered collection type Sorted ...