Programming VIP

1. What is combination mode? Compose objects into tree structures to represent part-whole hierarchies.Composite lets clients treat individual objects and compositions of objects uniformly. Composite Pattern: combine objects into a tree structure to represent the "part whole" hierarchy, so that users can use single objects and compos ...

This article is excerpted from "design patterns should be learned this way"1 definition of object pool modeObject Pool Pattern is a kind of creative design pattern. After objects are created and initialized in advance and put into the object pool, the object provider can use the existing objects to process requests, reducing the memor ...

1. What is decorator mode? Attach additional responsibilities to an object dynamically keeping the same interface.Decorators provide a flexible alternative to subclassing for extending functionality. Decorator Pattern: dynamically add additional responsibilities to an object. In terms of increasing functions, decorator pattern is more fl ...

What is singleton mode Singleton Pattern is one of the simplest design patterns in Java. This type of design pattern is a creation pattern, which provides the best way to create objects. The singleton pattern involves a single class that is responsible for creating its own objects while ensuring that only a single object is created. This cl ...

Basemvpvview is the basic View layer interface: public interface BaseMvpView { void showError(String msg); void complete(); void showProgressUI(boolean isShow); } You can see that some public interface methods are defined. In fact, this interface may not be required, but it is generally written for convenience. BasePresenter ...

Singleton Design Mode Singleton Pattern is one of the simplest design patterns in Java. This type of design pattern is creative and provides the best way to create objects. This pattern involves a single class that is responsible for creating its own objects while ensuring that only a single object is created. This class provides a way to ...

Responsibility chain model definition advantage shortcoming Scope of application code implementation Responsibility chain mode vs. decoration mode reference resources Responsibility chain model definition Chain of responsibility: multiple objects have the opportunity to process the request, so as to avoid the coupling relationship between ...

This article is excerpted from "design patterns should be learned this way" 1 UML class diagram of command pattern The UML class diagram of the command pattern is shown in the following figure. 2 reconstruct the player control bar using command mode If we develop a player, the player has playback function, drag progress bar function ...

preface: RecyclerView, as the most commonly used development component in Android development, does not need to use DiffUtils for simple static pages. In order to improve the rendering performance of RecyclerView, the easiest thing to think of is to use the DiffUtils component. On the one hand, only a changed Item is refreshed; On the other ha ...

public void startTest() { Tested<Test1th> test = new Tested<>(); test.set(new Test1th()); Test1th td = test.get(); } Very simple. What if we need Tested to hold multiple objects? Look at chestnuts: public class Tested<A, B> { private A a; private B b; public void set(A a ...