A simple design pattern example. Concept: A creational pattern. You basically need one "global-type" object to exist. Implementation is pretty cut-and-dry. Pros: We can be sure that there is only one ...

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; ...

Example 8 lists a singleton class that maintains a registry of singletons, registered by class name: Example 8. ... public class Singleton implements java.io.Serializable ...

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In the Singleton design pattern you never have more than one instance of a singleton class. ... [for example, java.lang.Math.sin(double)], you gain more flexibility by creating an instance.