The Singleton pattern in Java ensures that a class has only one instance throughout the program. It is useful when you need to control access to a shared resource. The key is making the constructor private and providing a static method to get the instance.
Here’s a simple implementation of the Singleton pattern:
public class Singleton {
private static Singleton instance;
private Singleton() { }
public static Singleton getInstance() {
if (instance == null) {
instance = new Singleton();
}
return instance;
}
}
In this example, the getInstance() method checks if the instance already exists. If not, it creates one. Singleton is commonly used in logging, database connections, and configuration settings. It ensures that the same instance is used throughout the application.
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