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2. Object-oriented programming - Wikipedia

   en.wikipedia.org/wiki/Object-oriented_programming

   Behavioral subtyping is undecidable in general, so it cannot be implemented by a program (compiler). Class or object hierarchies must be carefully designed, considering possible incorrect uses that cannot be detected syntactically. This issue is known as the Liskov substitution principle.

3. 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.

4. Class (computer programming) - Wikipedia

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

   In object-oriented programming, a class defines the shared aspects of objects created from the class. The capabilities of a class differ between programming languages , but generally the shared aspects consist of state ( variables ) and behavior ( methods ) that are each either associated with a particular object or with all objects of that class.

5. Class-based programming - Wikipedia

   en.wikipedia.org/wiki/Class-based_programming

   In class-based programming, inheritance is done by defining new classes as extensions of existing classes: the existing class is the parent class and the new class is the child class. If a child class has only one parent class, this is known as single inheritance , while if a child class can have more than one parent class, this is known as ...

6. Singleton pattern - Wikipedia

   en.wikipedia.org/wiki/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. It is one of the well-known "Gang of Four" design patterns , which describe how to solve recurring problems in object-oriented software. [ 1 ]

7. Object-oriented analysis and design - Wikipedia

   en.wikipedia.org/wiki/Object-oriented_analysis...

   This is called a class, or object (an object is created based on a class). Each object serves a separate function. It is defined by its properties, what it is and what it can do. An object can be part of a class, which is a set of similar objects. Information hiding: The ability to protect some object components from external entities.

8. Comparison of programming languages (object-oriented ...

   en.wikipedia.org/wiki/Comparison_of_programming...

   This comparison of programming languages compares how object-oriented programming languages such as C++, Java, Smalltalk, Object Pascal, Perl, Python, and others manipulate data structures. Object construction and destruction

9. Java syntax - Wikipedia

   en.wikipedia.org/wiki/Java_syntax

   A snippet of Java code with keywords highlighted in bold blue font. The syntax of Java is the set of rules defining how a Java program is written and interpreted. The syntax is mostly derived from C and C++. Unlike C++, Java has no global functions or variables, but has data members which are also regarded as global variables.