Programmer Think

class ParentClass { public int i = 10; } public class SubClass extends ParentClass { public int i = 30; public static void main(String[] args) { ParentClass parentClass = new SubClass(); SubClass subClass = new SubClass(); System.out.println(parentClass.i + subClass.i); } ...

Internal classes are not very well understood, but in fact, one class contains another class. Just as a person is made up of the brain, limbs, organs and other body results, the internal class is equivalent to one of the organs, such as the heart: it also has its own attributes and behavior (blood, beating). Obviously, instead of unilaterally ...

AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?>   <manifest xmlns:android="http://schemas.android.com/apk/res/android"         package="com.scott.phone"         android:versionCode="1"         android:versionName="1.0">              <!-- Declare a privilege  -->       <permission android:protectionLevel="normal" ...

For several ways to parse XML, you can go to someone else's blog. Here we show examples of how to generate and parse XML using DOM, SAX and DOM4J. Four ways to generate and parse XML documents (introduction + pros and cons + examples) Generate xml as DOM: public static void DomCreateXml() throws Exception { // 1. Create an object f ...

File upload and download are often used in R&D. Here I will summarize the steps of file upload and download. 1: Create a new web project and import two jia packages.If you don't have jar packages, please download them online. 2: Write forms on the web interface Contains file file file fields The form must be submitted as a post ...

new In one sentence, introduce new: The new operator creates an instance of a user-defined object type or of one of the built-in object types that has a constructor function. Still from MDN, the reason why the Chinese version is not used is that the translation is not understood... Let's translate this sentence ourselves: The new operator creat ...

Summary The access control process of API Server in Kuberntes is illustrated as follows: In Kubernetes, authorization is a step after authentication. Authorization is to determine whether a user (ordinary user or Service Account) has the right to request the Kubernetes API to do something. Previously, the authorization strategy i ...

Element Settings Continue MyBatis Configuration loading source code analysis: 1 private void parseConfiguration(XNode root) { 2 try { 3 Properties settings = settingsAsPropertiess(root.evalNode("settings")); 4 //issue #117 read properties first 5 propertiesElement(root.evalNode("properties")); 6 loadCustomVfs( ...

1. Introduction to ScrollView (official explanation): ScrollView is a general scrollable container in which you can put multiple components and views, and these components do not need to be of the same type. ScrollView can not only scroll vertically (default), but also horizontally (set by the horizontal attribute). 2. ScrollView common attr ...

The title of the original article is "Source Code Analysis", but later on, I think it is appropriate to use "source code learning". Before I have a thorough grasp of each letter in the source code, "parsing" is a bit of a headline party. It is suggested that before reading this article, it is better to open the sou ...