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  2. Singleton pattern - Wikipedia

    en.wikipedia.org/wiki/Singleton_pattern

    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.

  3. Initialization-on-demand holder idiom - Wikipedia

    en.wikipedia.org/wiki/Initialization-on-demand...

    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 ...

  4. Creational pattern - Wikipedia

    en.wikipedia.org/wiki/Creational_pattern

    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]

  5. Software design pattern - Wikipedia

    en.wikipedia.org/wiki/Software_design_pattern

    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]

  6. Lazy initialization - Wikipedia

    en.wikipedia.org/wiki/Lazy_initialization

    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 )

  7. Factory (object-oriented programming) - Wikipedia

    en.wikipedia.org/wiki/Factory_(object-oriented...

    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 ...

  8. clone (Java method) - Wikipedia

    en.wikipedia.org/wiki/Clone_(Java_method)

    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:

  9. Singleton - Wikipedia

    en.wikipedia.org/wiki/Singleton

    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