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  2. Instance variable - Wikipedia

    en.wikipedia.org/wiki/Instance_variable

    An instance variable is a variable which is declared in a class but outside of constructors, methods, or blocks. Instance variables are created when an object is instantiated, and are accessible to all the constructors, methods, or blocks in the class. Access modifiers can be given to the instance variable. An instance variable is not a class ...

  3. Member variable - Wikipedia

    en.wikipedia.org/wiki/Member_variable

    /*Ruby has three member variable types: class, class instance, and instance. */ class Dog # The class variable is defined within the class body with two at-signs # and describes data about all Dogs *and* their derived Dog breeds (if any) @@sniffs = true end mutt = Dog. new mutt. class. sniffs #=> true class Poodle < Dog # The "class instance variable" is defined within the class body with a ...

  4. Class (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Class_(computer_programming)

    Class variableVariable defined in a class whose objects all possess the same copy; Instance variable – Member variable of a class that all its objects possess a copy of; List of object-oriented programming languages; Trait (computer programming) – Set of methods that extend the functionality of a class

  5. Object-oriented programming - Wikipedia

    en.wikipedia.org/wiki/Object-oriented_programming

    Objects can contain other objects in their instance variables; this is known as object composition. For example, an object in the Employee class might contain (either directly or through a pointer) an object in the Address class, in addition to its own instance variables like "first_name" and "position".

  6. Singleton pattern - Wikipedia

    en.wikipedia.org/wiki/Singleton_pattern

    Providing a static method that returns a reference to the instance; The instance is usually stored as a private static variable; the instance is created when the variable is initialized, at some point before when the static method is first called. This C++11 implementation is based on the pre C++98 implementation in the book [citation needed].

  7. Naming convention (programming) - Wikipedia

    en.wikipedia.org/wiki/Naming_convention...

    Variables Local variables, instance variables, and class variables are also written in lowerCamelCase. Variable names should not start with underscore (_) or dollar sign ($) characters, even though both are allowed. This is in contrast to other coding conventions that state that underscores should be used to prefix all instance variables.

  8. Lazy initialization - Wikipedia

    en.wikipedia.org/wiki/Lazy_initialization

    This is typically accomplished by augmenting an accessor method (or property getter) to check whether a private member, acting as a cache, has already been initialized. If it has, it is returned straight away. If not, a new instance is created, placed into the member variable, and returned to the caller just-in-time for its first use.

  9. Java syntax - Wikipedia

    en.wikipedia.org/wiki/Java_syntax

    For example, java.io.InputStream ... Non-static members of a class define the types of the instance variables and methods, which are related to the objects created ...