The examples in this article describe Java's singleton pattern, which is a very important concept in Java programming. Share it with everyone for your reference. The specific analysis is as follows:
The so-called monad mode is to provide only a single instance to the outside world during the entire application process, which means that there is only one instance during the application, so there is no need to create instances repeatedly . Then according to his request, look at the following code for the simplest singleton mode:
public class Singleton { private static Singleton single = new Singleton(); private Singleton(){ } public static Singleton getSingletonInstance(){ return single; }}Through this code, we found that if we want to implement an instance of this Singleton class, we must pass the constructor, but its constructor is private, so it cannot be instantiated in other classes, but it can be implemented through the getSingletonInstance method. , can return an instance single, because it is a public static function and can be called by other classes. This is a simple singleton pattern. Of course, you can also put the statement that constructs single in the getSingletonInstance method.
To summarize the characteristics of the singleton pattern:
1. The construction method is privately modified.
2. There is a private static application instance.
3. There is a static public method that returns an instance of the class.
In fact, these three characteristics are entirely determined by the requirements of the singleton mode.
I hope that what this article describes will be helpful to everyone's learning of Java programming.