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  2. Boxing (computer programming) - Wikipedia

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

    With automatic unboxing the compiler automatically supplies the extra source code that retrieves the value out of that object, either by invoking some method on that object, or by other means. For example, in versions of Java prior to J2SE 5.0, the following code did not compile:

  3. Messier object - Wikipedia

    en.wikipedia.org/wiki/Messier_object

    Charles Messier. The first edition of 1774 covered 45 objects (M1 to M45).The total list published by Messier in 1781 contained 103 objects, but the list was expanded through successive additions by other astronomers, motivated by notes in Messier's and Méchain's texts indicating that at least one of them knew of the additional objects.

  4. Template:Messier objects - Wikipedia

    en.wikipedia.org/wiki/Template:Messier_objects

    Afrikaans; العربية; বাংলা; Беларуская; Беларуская (тарашкевіца) Български; Bosanski; Čeština; Corsu

  5. Caldwell catalogue - Wikipedia

    en.wikipedia.org/wiki/Caldwell_catalogue

    While the Messier catalogue is used by amateur astronomers as a list of deep-sky objects for observation, Moore noted that Messier's list was not compiled for that purpose and excluded many of the sky's brightest deep-sky objects, [1] such as the Hyades, the Double Cluster (NGC 869 and NGC 884), and the Sculptor Galaxy (NGC 253). The Messier ...

  6. Marker interface pattern - Wikipedia

    en.wikipedia.org/wiki/Marker_interface_pattern

    An example of the application of marker interfaces from the Java programming language is the Serializable interface: package java.io ; public interface Serializable { } A class implements this interface to indicate that its non- transient data members can be written to an ObjectOutputStream .

  7. Builder pattern - Wikipedia

    en.wikipedia.org/wiki/Builder_pattern

    The builder pattern is a design pattern that provides a flexible solution to various object creation problems in object-oriented programming.The builder pattern separates the construction of a complex object from its representation.

  8. Observer pattern - Wikipedia

    en.wikipedia.org/wiki/Observer_pattern

    Below is an example written in Java that takes keyboard input and handles each input line as an event. When a string is supplied from System.in , the method notifyObservers() is then called in order to notify all observers of the event's occurrence, in the form of an invocation of their update methods.

  9. NGC 5195 - Wikipedia

    en.wikipedia.org/wiki/NGC_5195

    NGC 5195 (also known as Messier 51b or M51b) is a dwarf galaxy that is interacting with the Whirlpool Galaxy (also known as M51a or NGC 5194). Both galaxies are located approximately 25 million light-years away in the constellation Canes Venatici .