We want loosely coupled classes. Unit testing individual classes becomes more difficult. Example: In the following example, we exhibit how the Singleton Pattern can be used to have a single logger for ...

For example, in Java, a simple singleton class can be written as: public class Singleton { // A private static field to store the instance private static Singleton instance; // A private ...

Example 11 shows a Singleton class that uses the registry: Example 11. A Singleton class that uses the registry import java.util.HashMap; import org.apache.log4j.Logger; public class Singleton ...

Most commonly, you implement a singleton in Java by having a single instance ... the singleton class can be easily altered. For example, most servlets run as singletons in their servlet engines.

# [Difference between Singleton Pattern vs Static Class in Java](https://javarevisited.blogspot.com/2013/03/difference-between-singleton-pattern-vs-static-class-java ...