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A class diagram exemplifying the singleton pattern.. In object-oriented programming, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance.
The implementation of the idiom relies on the initialization phase of execution within the Java Virtual Machine (JVM) as specified by the Java Language Specification (JLS). [3] When the class Something is loaded by the JVM, the class goes through initialization. Since the class does not have any static variables to initialize, the ...
factory method pattern, which allows a class to defer instantiation to subclasses. [4] prototype pattern, which specifies the kind of object to create using a prototypical instance, and creates new objects by cloning this prototype. singleton pattern, which ensures that a class only has one instance, and provides a global point of access to it. [5]
Empty interface to associate metadata with a class. Yes Yes Effective Java [21] Module: Group several related elements, such as classes, singletons, methods, globally used, into a single conceptual entity. Yes Yes Yes Proxy: Provide a surrogate or placeholder for another object to control access to it. Yes Yes Yes Twin [22]
Using a factory method to create instances of a class (factory method pattern) Storing the instances in a map , and returning the same instance to each request for an instance with same parameters ( multiton pattern )
In class-based programming, a factory is an abstraction of a constructor of a class, while in prototype-based programming a factory is an abstraction of a prototype object. A constructor is concrete in that it creates objects as instances of one class, and by a specified process (class instantiation), while a factory can create objects by instantiating various classes, or by using other ...
When writing a class using the Singleton pattern, only one instance of that class can exist at a time. As a result, the class must not be allowed to make a clone. To prevent this, one can override the clone() method using the following code:
Singleton pattern, a design pattern that allows only one instance of a class to exist; Singleton bound, used in coding theory; Singleton variable, a variable that is referenced only once; Singleton, a character encoded with one unit in variable-width encoding schemes for computer character sets