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2. Class (computer programming) - Wikipedia

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

   Not all languages support multiple inheritance. For example, Java allows a class to implement multiple interfaces, but only inherit from one class. [22] If multiple inheritance is allowed, the hierarchy is a directed acyclic graph (or DAG for short), otherwise it is a tree. The hierarchy has classes as nodes and inheritance relationships as links.

3. Java (programming language) - Wikipedia

   en.wikipedia.org/wiki/Java_(programming_language)

   Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere (), [16] meaning that compiled Java code can run on all platforms that support Java without the need to recompile. [17]

4. Java syntax - Wikipedia

   en.wikipedia.org/wiki/Java_syntax

   For example, java.io.InputStream is a fully qualified class name for the class InputStream which is located in the package java.io. A package is declared at the start of the file with the package declaration:

5. Object-oriented programming - Wikipedia

   en.wikipedia.org/wiki/Object-oriented_programming

   Some languages (Java, for example) let classes enforce access restrictions explicitly, for example, denoting internal data with the private keyword and designating methods intended for use by code outside the class with the public keyword. [44]

6. Singleton pattern - Wikipedia

   en.wikipedia.org/wiki/Singleton_pattern

   import std; class Singleton {public: ... The following Java 5+ example [6] is a thread-safe implementation, using lazy initialization with double-checked locking.

7. Visitor pattern - Wikipedia

   en.wikipedia.org/wiki/Visitor_pattern

   This example declares a separate ExpressionPrintingVisitor class that takes care of the printing. If the introduction of a new concrete visitor is desired, a new class will be created to implement the Visitor interface, and new implementations for the Visit methods will be provided. The existing classes (Literal and Addition) will remain unchanged.

8. Class-based programming - Wikipedia

   en.wikipedia.org/wiki/Class-based_programming

   Also, another common example is that a person object created from a child class cannot become an object of parent class because a child class and a parent class inherit a person class but class-based languages mostly do not allow to change the kind of class of the object at runtime. For class-based languages, this restriction is essential in ...

9. Java class file - Wikipedia

   en.wikipedia.org/wiki/Java_class_file

   A Java class file is a file (with the .class filename extension) containing Java bytecode that can be executed on the Java Virtual Machine (JVM).A Java class file is usually produced by a Java compiler from Java programming language source files (.java files) containing Java classes (alternatively, other JVM languages can also be used to create class files).