23 questions
Hello, everyone I'm a beginner web designer https://codepen.io/ferry/pen/ZYVwxzI'd like to use this accordionI looked at the CSS. .Class name { Selector { Selector { }There's a structure where you p...
How do I set up a class that represents the interface?Can I just write an abstract class?
What is the difference between Padding and Margin in the view?
https://developer.android.com/intl/ko/training/material/lists-cards.htmlIf you look here
In most object-oriented languages, when you name an interface, you put the capital i in front of it. But why not in Java? Why not?I mean, when I implement User Interface and User, there are two ways.B...
It's a general OOP question. I want to make a general comparison between Interface and the basic use of abstraction classes. I want to know the difference between using the interface and using the abs...
First of all, this is the layout code I wrote: <?xml version=1.0 encoding=utf-8?><LinearLayout xmlns:android=http://schemas.android.com/apk/res/android android:orientation=vertical android:la...
If you change the image of Recyclerview B when an event occurs in Recyclerview A, there is an error in this part.Logic is like this.It's A - Activity - B Recycler View.E/AndroidRuntime: FATAL EXCEPTIO...
For example, in the class Fragment 1, there are various events [Spinner, Switch, SeekBar] and so onIs there a way to put the initial values of these events together and put them in Message.obj and sen...
I think it's a question about the design pattern ^^In situations where multiple classes implement a single interface, If you need to create a new implementation in a particular class (add a new method...
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