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  2. Object REXX - Wikipedia

    en.wikipedia.org/wiki/Object_REXX

    Objects are manipulated using methods instead of traditional functions. In ooRexx, a string variable is a reference to a string object and does not need to be declared, which reduces the effort for programmers compared to strictly typed languages. [33] A string object can be of any length and contain any characters, including numerical values.

  3. Java syntax - Wikipedia

    en.wikipedia.org/wiki/Java_syntax

    interface StringManipulator {String extendString (String input); // A method which is optional to implement default String shortenString (String input) {return input. substring (1);}} // This is a valid class despite not implementing all the methods class PartialStringManipulator implements StringManipulator {@Override public String ...

  4. String interning - Wikipedia

    en.wikipedia.org/wiki/String_interning

    The single copy of each string is called its intern and is typically looked up by a method of the string class, for example String.intern() [2] in Java. All compile-time constant strings in Java are automatically interned using this method. [3] String interning is supported by some modern object-oriented programming languages, including Java ...

  5. File:Java Programming.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Java_Programming.pdf

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  6. 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".

  7. 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.

  8. Primitive wrapper class in Java - Wikipedia

    en.wikipedia.org/.../Primitive_wrapper_class_in_Java

    Primitive wrapper classes are not the same thing as primitive types. Whereas variables, for example, can be declared in Java as data types double, short, int, etc., the primitive wrapper classes create instantiated objects and methods that inherit but hide the primitive data types, not like variables that are assigned the data type values.

  9. List of Java keywords - Wikipedia

    en.wikipedia.org/wiki/List_of_Java_keywords

    The long keyword is used to declare a variable that can hold a 64-bit signed two's complement integer. [5] [6] This keyword is also used to declare that a method returns a value of the primitive type long. [7] [8] native Used in method declarations to specify that the method is not implemented in the same Java source file, but rather in another ...