LISP:Object System Lisp
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CLOS is an object-oriented extension to Common Lisp. It includes classes, slots, inheritance, generic functions and methods. Classes define structure and behavior of objects through slots and methods. Subclasses inherit structure and behavior from superclasses. Generic functions dispatch methods based on an object's class. CLOS allows customizing behavior through metaobjects and redefining existing classes while preserving existing functionality.
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chap 6 : Objects and classes (scjp/ocjp)
chap 6 : Objects and classes (scjp/ocjp)It Academy .1 Develop code that declares classes (including abstract
and all forms of nested classes), interfaces, and enums,
and includes the appropriate use of package and import
statements (including static imports).
1.4 Develop code that declares both static and non-static
methods, and - if appropriate - use method names that
adhere to the JavaBeans naming standards. Also develop
code that declares and uses a variable-length argument list.
1.5 Given a code example, determine if a method is correctly
overriding or overloading another method, and identify
legal return values (including covariant returns), for the
method.
1.6 Given a set of classes and superclasses, develop
constructors for one or more of the classes. Given a
class declaration, determine if a default constructor will
be created, and if so, determine the behavior of that
constructor. Given a nested or non-nested class listing,
write code to instantiate the class.
5.1 Develop code that implements tight encapsulation,
loose coupling, and high cohesion in classes, and describe
the benefits.
5.2 Given a scenario, develop code that demonstrates the
use of polymorphism. Further, determine when casting will
be necessary and recognize compiler vs. runtime errors
related to object reference casting.
5.3 Explain the effect of modifiers on inheritance with
respect to constructors, instance or static variables, and
instance or static methods.
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LISP:Object System Lisp
- 2. overviewProgrammer interface conceptsClassesSlotsInheritanceGeneric functions and methodsIntroduction to generic functionsIntroduction to methodsStandard method classes and method objectsObject creation and initializationExtensions
- 3. Programmer interface conceptsThe common lisp open system(CLOS) is an object-oriented extension to Common Lisp.In the standard programmer interface of CLOS, we have,The first part, Programmer interface concepts
- 4. The second part, Functions in programmers interface, contains a description of the functions and macros in CLOS programmers interface.
- 5. The third part, common lisp object system meta-object protocol, explains how the CLOS has to be customized.classesA class is an object that determines the structure and the behavior of a set of other objects, which are called its instances.A class can inherit structure and behavior from other classes.A class whose definition refers to other classes for the purpose of inheriting The classes that are designated for the purpose of inheritance are said to be the super classes of the inheriting class.
- 6. The function class-name takes a class object and returns its nameEach class has a class precedence list, which is the total ordering on the set of the given class and its super classes.The total ordering is a list ordered from the most specific to least specific.
- 7. Defining classesThe macro defmacro is used to define a new named class.The definition includesName of the new class.
- 8. List of the directed super classes of the new class
- 9. A set of slot specifiers
- 10. A set of class optionsThe generic function make-instance creates and returns a new instance of a class.
- 11. slotsAn object that has standard-class as its metaclass has zero or more slots.The slots of an object are determined by the class of the object.Each slot can hold one value.The default initial value of a slot is defined by the :initform slot option.
- 12. A local slot is the one that is visible to exactly one instance, namely the one in which the slot is allocated.A shared slot is defined to be a slot that is visible to more than one instance of a given class and its subclassesA slot can be accessed in two ways: by the use of primitive function slot-value.
- 13. By use of generic functions generated by the defclass form.InheritanceA class can inherit methods, slots and some defclass options from its super classes.A subclass inherits methods in the sense that any method applicable to all instances of a class is also applicable to all instances of any subclass of that class.Inheritance of class options:The :default-initargs class option is inheritedEx: ( defclass c1 () ((s1 :initform 5.4 :type number) (s2 :allocation :class))) Instances of class c1 have a local slot named s1, whose default initial value is 5.4
- 14. s1 should always be a number.
- 15. Class c1 also has a shared slot named s2.(defclass c2 (c1) ((s1 :initform 5 :type integer) (s2 :allocation :instance) (s3 :accessor c2-s3)))There is a local slot named s1 in instances of c2.
- 16. The default initial value of s1 is 5.
- 17. The value of s1 will be of type integer.
- 18. There are also local slots of named s2 and s3 in instances of c2.
- 19. The class c2 has a method for c2-s3 for reading the value of slot s3.Determining the class precedence ListThe defclass form for a class provides a total ordering on that class and its direct super classes.This ordering is called the local precedence order.The class precedence list for a class C is a total ordering on C and its super classes that is consistant with the local precedence orders for C and its super classes.
- 20. Class precedence list ArrayBit-vectorCharacterComplexConsFloatFunction*Hash-table*IntegerListNull
- 22. Introduction to generic functionsA generic function object contains a set of methods, lambda-list, a method combination type, and other information.A generic function can be given a global name using the defmethod and defgeneric construct.A generic function can be given a local name using generic-flet, generic-labels, or with-added-method special forms.
- 23. Introduction to methodsA method object contains a method function, a sequence of parameter specializes which specify when the given method is applicable, a lambda-list and a sequence of qualifiers.A method-defining form contains the code that is to be run when the arguments for the generic function cause the method that it defines to be invoked.
- 24. Congruent lambda-list for all methods of a generic function Each lambda-list must have the same number of required parametersEach lambda-list must have the same number of optional.If any lambda-list mentions &rest or &key, each lambda-list must mention one or both of them.If the generic function lambda-list mentions &key, each method must accept all of the keyword names mentioned after &key, either by accepting them explicitly, by specifying &allow-other-keys, or by specifying &rest but and &key.
- 25. Standard method combinationStandard method combination is supported by the class standard-generic-function.Primary functions define the main action of the effective method, while auxiliary methods modify that action in one of three ways:A primary method has no method qualifier.An auxiliary method is a method whose method qualifier is :before, :after, or :aroundThe macro define-method-combination defines new forms of method combinations.It provides an effective method for customizing the production of the effective method.
- 26. Meta objectsThe meta-object protocol specifies a set of generic functions defined by methods on classes.The instances of these classes on which those methods are defined are called meta-objects.The metaclass determines the representation of instances of its instances and the forms of inheritance used by its instances for slot descriptions and method inheritance.
- 27. Standard Meta-classes and objectsThe common lisp provides a set of meta-classes which includeStandard-class (default class)
- 28. Built-in-class (instances are classes that have special implementations with restricted capabilities)
- 29. Structure-class (all classes defined by means of defstruct are instances of structure-class)Set of metaobjects provided by the common lisp include:Standard-method (default class of methods)
- 30. Standard-generic-function (default class of generic functions)
- 31. instance of the class standard class
- 32. Method-combination (every method combination object is an instance of a subclass of the class method-combination)Object creation and initializationThe generic function make-instance creates and returns a new instance of a class.The first argument is a class or the name of the class , and the remaining arguments form an initialization argument list.An initialization argument controls object creation and initialization.Keyword symbols are used to make initialization objects.A default value form can be used for an initialization argument by using the :default-initargs class option.
- 33. Rules to specify when initialization arguments may be multiply defined:A given initialization argument can be used to initialize more than one slot if the same initialization argument name appears in more than one :initarg slot option.A given initialization argument name can appear in the lambda-list of more than one initialization method.A given initialization argument name can appear in an :initarg slot option and in the lambda-list of an initialization method.
- 34. Redefining a classA class that is an instance of standard-class can be redefined if the new class will also be an instance of standard-class.Redefining modifies the existing class object, it does not create a new class object for the class.Any method object created by :reader, :writer, or :accessor option specified by the old defclass form the corresponding generic functions and methods specified by the new defclass form are added.
- 35. extensionsThere are two extensions allowed for class redefinition:The object system may be extended to permit the new class to be an instance of a metaclass other than the metaclass of the old class.
- 36. The object system may be extended to support an updating process when either the old or new class is an instance of a class other than standard-class that is not a built-in class.Visit more self help tutorialsPick a tutorial of your choice and browse through it at your own pace.The tutorials section is free, self-guiding and will not involve any additional support.Visit us at www.dataminingtools.net