Android public interface

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By Ryan on September 13, In fact, it was only through actually using them in my own Applications, that I began to understand how useful they can be. That being said, I hope to demonstrate that Interfaces are quite straight forward, and only require a good explanation. Check out the video here. Method bodies exist only for default methods and static methods.
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How To Create New Java Class In Android Studio

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In android development, java class is commonly used to implement business logic process such as database access, send email, send short message etc. We always use one java class to encapsulate some related functions. So we can think java class as Model role in MVC pattern. This example will show you how to create new java class in android studio, and we will create a SMSBean java class which will implement short message send and receive functions. The user interface of this example is not complex, there will have two button in the screen one is used to send short message, the other is used to receive short message. When you click any of the two button, an AlertDialog will popup showing some messages. So if you want to run this example, you should create a new activity and layout xml files to implement user interface.
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Why a library developer should use abstract class instead of interface

An interface in Java is a blueprint of a class. It has static constants and abstract methods. The interface in Java is a mechanism to achieve abstraction. There can be only abstract methods in the Java interface, not method body. It is used to achieve abstraction and multiple inheritance in Java.
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An interface is a reference type in Java. It is similar to class. It is a collection of abstract methods.

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