kotlin launch

There's something new in the enumeration class in Kotlin: The constant of an enumeration class can be seen as an anonymous class with the same name.Since it is a class, it can be associated with a methodCheck the code of the official websiteIf you have experienced the use of enumerations in other languages, you may be confused by this definition and explanation.I'll give you an example and a result, and you'll be much clearer.Enum class Protocolstate

According to the current development model and some information on the internet, Springboot needs to be layered into business and operations, usually divided into controllers, entity, service, respository and other structures. Below is the Kotlin official website example, explains in the stratification time, needs to do what configuration.1, in the package com. Springbootusekotlin New Package entity, add a new class, named People Packagecom.kotlinSpri

Read a piece of code first private var Cloth_rv:recyclerview = null cloth_rv!!. Sethasfixedsize (True) 。 : Indicates whether the current object can be empty 。。 : Indicates that the current object is not empty for execution It's all kotlin for us. Methods for examining null pointers "Kotlin Grammar Foundation to actual combat development" series course video Http://edu.csdn.net/course/detail/6409?

Returns and Jumps Like Java, there are 3 jump statements in Kotlin return break continue break and Continue tags We can give an alias to any expression, Kotlin call this a label. Take an example of the previous for Loop statement Doctorq@for (index in array.indices) { println (index) } I've added a label to this for loop, with a suffix of @ doctorq@ for (i-1..100) { doctorq2@ for (J-in

Arrays are represented by arrayThere are three ways to initialize a number group:var = arrayof (array1:arrayvar array2:arrayvar array3:arrayKotlin also has a specialized class with no boxing overhead to represent arrays of native types: ByteArray, Shortarray, Intarray, and so on. These classes and arrays have no inheritance relationships, but they have the same set of method properties.The array type of the basic type of Kotlin (number, character, Boo

parameter, but it is not the first parameter. When called, the parameter B is assigned by means of the parameter name = value, otherwise the assigned value is passed to the variable parameter a. To turn on the class of the KT file above, you can find that the corresponding Java code for this function is as follows: As you can see, variable parameter A has become a string array. Generic type Specify the generic type by Fun Main (args:arrayThis functionality is equivalent to extending the funct

When testing the Kotlin, we need a main function entry that is the same as the Java language, so be careful how you create it. Right-click Select the File type when you create a new item here.When you click OK, you create a. kt file that basically has nothing but a package xx.Then enter main return, the final generated main function: Fun Main (args:array After generating the main function, we can create the class directly in the current. kt file

Launch File 1 Using launch files2 Creating launch Files3 Starting nodes in namespace4 Remapping names5 Other launch elements 1 Using launch files Launch files are provided by Ros and can run multiple nodes files at the same time

Ros uses the Rosrun command to start a node, and if you need to start Node Manager (master) and multiple nodes at the same time, you need to use the launch file to configure it. The launch file is a special XML format file, usually with a. Launch as a file suffix. Each launch file must contain a root element. Roslaunch

Https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/LaunchImages.html Launch Images A launch file or image provides a simple placeholder image, IOS displays when your apps starts up. The placeholder image gives users the impression that your app are fast and responsive because it appears instantly and is Quickly replaced by the first screen of the Your app. Every app mu

The Quick Launch bar is a handy tool that allows you to go back to your desktop or open IE and so on with just one click. If your computer's Quick Launch bar is gone, the Quick Launch bar is missing, which means your computer has a malicious program that has corrupted the system registry and left your computer with an unusual problem. Such problems arise and we c

Switching from XP system to Win7 system is believed to have seen the Win7 system tray by default is not a Quick Launch bar, if the use of Win7 system for a long time should feel no impact. The impact of those who have just changed to Win7 system is quite large. Here, teach you how to do that. Restores the Quick Launch bar to the taskbar. 1 Right-click the taskbar, select the toolbar-new toolbar. In the f

Each icon in the Quick Launch bar represents a program on your computer, and you can quickly start the application by clicking the appropriate icon. Windows Media Player player icon, ie browser icon, OE icon, and display Desktop icon are the default. When we install some software, we also add the Quick Launch bar icon. 1. Q: Once a friend has used my computer, I don't know what's going on with the Quick

Player AVI (Xvid, MP3)GST-launchfilesrc location =/home/magpie/sample-multimedia/wowintro2.avi! Avidemux name = Demux. audio_00! Mad! Audioconvert! Audioresample! Autoaudiosink Demux. video_00! Queue! Xviddec! Ffmpegcolorspace! Videoscale! Autovideosink Time overlayGST-launchfilesrc location =/home/magpie/sample-multimedia/wowintro2.avi! Avidemux name = Demux. audio_00! Mad! Alsasink Demux. video_00! Queue! Xviddec! Ffmpegcolorspace! Timeoverlay! Xvimagesink With seekingGST-launchfilesrc locatio

Many users who use XP for a long time have a deep reliance on the Quick Launch bar on the taskbar, but in the Win7 or Win8 system, the taskbar no longer has a quick Launch bar. However, we can do this with a little bit of skill. Action method: Windows8 By default there is no Quick Launch bar, but we can add it in the following way, click the right mouse button

In the XP system, the Quick Launch bar style is also more classic, and in Win7 above version of the operating system boot bar also has a great change, but many users still prefer the XP Quick Launch bar classic style, actually hungry oh mody can set the win7 boot bar to XP classic style, If you miss the XP boot Bar classic style, you might as well try the following setup techniques. 1, right click on the t

When we delete the files in the Quick Launch bar, we sometimes accidentally erase the display table. But show the desktop is a very practical function, no matter how many things you open, as long as the desktop can immediately return to your desktop, so that the use of the function is gone, how to do? I'll explain it to you. How to restore the Quick Launch bar display Desktop icon a few small ways. 1-Clic

One, new Quick Launch toolbar The user can click on "taskbar" by right mouse button, click "New Toolbar" in "Toolbar" option in the right button menu, then pop-up "new Toolbar" window. Then, in the blank box on the right side of the folder in the New Toolbar window, type%userprofile%appdataroamingmicrosoftinternet explorerquick Launch, and then click Select Folder. You can display

Quick Launch bar Some quick Launch bars will have a ">>" sign, which means that there are more shortcut icons on the Quick Launch bar, which can be clicked to open a "more" menu that lists all the shortcut icons on the Quick Launch bar. In these icons, you drag the shortcut icon you use most often to the location dire

In our actual product use or design process, there will always be 2-3 seconds left for our product launch page. So why does all products have the startup pages of these seconds? What is its purpose? Why are some products always happy to change the startup page? Here I will summarize some of the analysis on the launch page for your reference. 　　1. What is the product lau