IS Java Is puer Object Oriented Language

Pls I don't agree that java is puer OO.
This is the example..
I have 2 classes
class One {
public void main( Strin...) {
Two t = t new Two();
t.print();
class Two {
public void print ( ) {
S.o.p(" Not a object Oriented");
Now if i compil the both the class ane run the
first classs java One
it prints the msg... is fine
buu now i change the access modifier of the class Tow of the method print() and private ..
and compile the class Two not the One...
then i run the class One..
still it prints the msg..
It does't give any error... untile i recompile the one.java with the Two.class the it says print() can not be accsed..
can u say now it violate.. the OOPs concept..

You have discovered a part of Java that when you think OO does not do what you would expect. The system itself does not act in an OO way, but this does not mean that the language is not. It may not yet be Component friendly in a way that allows you to write components and then dynamically deploy them while thinking of the deployed components as objects that are instances of the component ?class?.
It took me a long time to accept that every single person has a different concept of what OO means. I had someone at Sun (during an interview) tell me that for pure OO an accessor or mutater should do nothing more than return a member or replace the value of that member with the exact value in the parameter. (Needless to say I didn't want or receive that position although I still wouldn?t mind working for Sun :)
I always thought that a ~pure~ OO language had to be completely type safe. (or as close as you can get) There could be no run time type errors. Well, this counts out not only Java, but also Smalltalk.
I am also of the opinion that there should be no "base types" (no mater how they are handled under the covers) C# does this nicely.
Then there is Parametric Polymorphism, which can be done nicely by generic typing and will be available in Java soon. This addition to a language is invaluable in allowing the developer to think in an OO way.
Invariants are another language feature that some would require for OO.
The point is that everyone has a different set of opinions about all of these things. I am absolutely certain that my opinions are the correct ones, as is anyone who is passionate about OO.
In my opinion Generics and Accretions have really made Java come of age. It is finally a language that I will think of as OO enoug.
Hopefully some day we will also get asynchronous methods (instead of threads) a better defined contract specification, and do away (at least on the surface) with base types. Then it would be a real OO system.
Wait, wait, we could add orthogonal persistence, or at least a typed persistence. We could outlaw public member feilds, We could fix the typeing issues with interfaces, we could...
sigh At least Java is moving forward. It may be dog slow, but as someone recently told me, there are actualy people out there building real systems with Java and they need it to move slow enough to get their work done, so they can make money, so they can pay people to develop.
You got to make sure that while you are reaching for that pie in the sky, it doesn't fall on your face. But then I like a bit of slapstick.

Similar Messages

Is java 100% pure object oriented?

I am very confuse is java 100% pure object oriented language.
bcoz
1)object oriented means everything should be in object but
primitive data type is not object.
2) java don't support multiple inheritances which is one of the oop 's
concept

I'd say that java is 100% java. No more, noless.
I'm gonna say it's about 99.4738383% java. For
no
reason other than to confuse idiotsSomeone's always bumping their heads against
some
arbitrary theoretical purity when they aremissing
what was, is and always has been most important:
functionality.Functionality matters virtually nothing to thepeople
that post these "questions". All that matters is
being able to say the right thing in interviews so
they can get a job and get carried through their
career by people who actually know what they're
doing. See it all the timeHehe, who carries you whilst you post here all day
:P
Ant builds, mostly :p

Java is 100% pure object oriented language or not?

PLS help me...?
I am get confussed.
Java is 100% pure object oriented language or not?

the only full OO programming language on thisplanet
is SmallTalk.On your planet maybe. On mine, at least Eiffel
also exists, probably more unknown others too. Some
count Ruby, but I never looked at it.Ruby is pure OO too, FYI.
the only full OO programming language on thisplanet
is SmallTalk.Care to explain it in some more detail? What
exactly is 100% OO, b.t.w.?No, I don't careWow, what an incredibly unhelpful response.
In essence, 100% OO implies that every type within the language is an object. Since Java has primitive types like int, boolean, float etc, it cannot count as 100% OO.

Java is pure object oriented programing language or not why?

please clear
java is pure object oriented programing language or not why?

And there is some concepts of object orientation that
Java not implements like: Operator
Overloading and Multiple Heritage. But, i think
that we can live without those features.
And the sucess of Java is a proof of this.I don't believe that operator overloading and multiple inheritance are required aspects of object programming.

Why java is called as true object oriented language?

HI Friends,
Though few oops concepts is not supported , why java is called as truly object oriented language and C++ as not a purely object oriented language???? Please, if any one know , give me the answer.
Thanks to all.

few oops concepts is not supportedwhich concepts?
as far as i know...to be OO, you must supports
encapsulation, abstraction, inheritancxe, composition (aggretration, et all) and polymorphism. Java supports all those comcept..now..Java is a hybrid due to what Jverd has pointed out.
the only pure OO language that i know of is SmallTalk. they have Meta class that can create Class object. and all their primitaives are object.
C# comes close, but their Class are not object.

What is the strict criteria for a Pure Object Oriented Language ?

Can a fully object oriented language qualify as a pure Object Oriented Language.fF not what are the exact criteria for qualifying a language as Pure Object Oriented Language.Any examples of both would be greatly appreciated.
Thanks in Advance.

I guess you can check the link
http://forums.sun.com/thread.jspa?forumID=31&threadID=725662 for this.
I have no idea what point you're trying to make by posting a link to that thread.
Again,if someone thinks that something does not exist,what's the point debating on it.There is no point in debating this.
I don't care,Me neither.
tell me the definition,Like I already said many times: there exists no widely accepted definition of what a "pure OO language" is!
So, I ask you yet again: what is YOUR definition of such a thing? ANd don't go posting links to articles or other threads: just explain in your own wording of what YOU think a "pure OO language" is, and I'll answer your question by telling you if Java fits that definition.
search on google,why do you need that are not answers to my questions I see it has no use arguing with you: you don't seem to understand me.
,but more irrelevant questions on my simple question.I see a chain of irrelevant question, starting with your original post.

Is Java purely Object Oriented Language ?

Hi All,
Can any of you java masters tell me whether java is a purely OOL or not ?
and if yes then what are those factor that make a language OO , and if not then why ?

Hi All,
Can any of you java masters tell me whether java is a
purely OOL or not ?
and if yes then what are those factor that make a
language OO , and if not then why ?What about asking your teacher, or searching the forum? This question is frequently asked so you will not have any problems in finding a thread where this is discussed.
Kaj

Facilities of object oriented java

What could be the two facilities which Java, as an 'Object Oriented' language, has which JavaScript , as an 'Object Based language, does not have.

Sounds to me like you're one of those guys who takes exam questions right off the exam and just posts them here expecting others to answer your exam for you.

Is Java pure Object-Oriented ????

hi friends,
wat do u feel, Is java a pure object oriented language??? then wat is object oriented pgming ???
bye..

> wat do u feel, Is java a pure object
oriented language??? then wat is object oriented
pgming ???
On "purity" as a measure of object-orientedness:
However, this definition is problematic in that it implies that "purity" is a valid concept. Yet, there is no accepted definition of the term "pure OO language". Despite years of discussion and argument on the net, and in other circles, I have never seen anyone present a definition of a "pure OOPL" that met with general agreement by others.
-- Robert Martin, founder, CEO, and president of Object Mentor Inc., software industry leader.
On the value of using "purity" as a measure of a programming language:
I will not go into the discussion about ``purity'' beyond mentioning that I think that a general purpose programming language ought to and can support more than one programming style (``paradigm'').
-- Bjarne Stroustrup, designer and implementer of the C++ programming language, etc.
~

Why java is called pure object oriented.

i know that java is called as pure object oriented language.
why it is called so even though it has primitive datatypes and also it doesnot support multiple inheritance completely. it only supports in the case of interfaces but not in the case of classes. then why it is called pure object oriented.

Its because you cannot write an executable java program without creating an object. Well, you can:
public class a
public static void main( String a[] )
}In contrary to C++, there can be no variables or functions in the wild (outside a class).
You can not create an executable java program without creating a class (but not forcibly its instance, an object.)
The "pure object oriented" wording in this sense has not really much importance, it is rather a marketing ploy.

Is Java 100% Object Oriented?

Is java 100% pure OOP?
I said no.. the reason is we can use primitive data types(which is not a
object)also....and also static method which can be accessed without
creating objects...Hope u understood my problem.
Can anyone give clear idea about this and mention if anything wrong with
my answer.........

Hi Guys,
No, Java is not a pure Object Oriented Language.
Many languages claim to be Object-Oriented. While the exact definition of the term is highly variable depending upon who you ask, there are several qualities thati feel an Object-Oriented language should have:
* Encapsulation/Information Hiding
* Inheritance
* Polymorphism/Dynamic Binding
* All pre-defined types are Objects
* All operations performed by sending messages to Objects
* All user-defined types are Objects
Java fails in the fourth condition because Java has primitive types viz; int ,float etc.....
And it also fails at the fifth condition because it fails to satisfy the fourth condition.
Only three languages are pure Object-Oriented
* Eiffel
* Smalltalk
* Ruby
For other details u can visit the blog created by me at http://noviceinjava.blogspot.com/
Though it has just started it will certainly grow as people get to know bout it
Thanks n Regards
Naveen M

Object oriented programming aspects in Oracle

Dear All,
Can you one explain me the aspects of Object Oriented Programming in Oracle. How to use oops concepts in Oracle Procedures, functions, packages, etc.
Thanks,
Moorthy.GS

Oracle 9i introduces support for inheritance, method overriding and dynamic method dispatch (or "dynamic binding", or "virtual").
A method call is dispatched to the nearest implementation, working back up the inheritance hierarchy from the current or specified type.
See, for example, how we can implement the Template Design Pattern in PL/SQL, using inheritance, method overriding and dynamic method dispatch:
http://www.quest-pipelines.com/pipelines/plsql/tips06.htm#OCTOBER
Oracle 11g introduces support for "super" object-oriented keyword. One attempt to do this in PLSQL 9i/10g:
Calling the Parent Object's Version of an Overridden Method
http://www.quest-pipelines.com/pipelines/plsql/tips03.htm#JUNE
I expect some OO improvements in the future (in Oracle 12oo ...):
1. References between transient objects (instances of objects types) and (then) garbage collector
2. Generic classes (templates, generics) like in Eiffel, C++, Java 5 (PL/SQL was modeled after ADA 83, and ADA 83 has generic packages)
3. Multiple inheritance like in Eiffel (inner classes like in Java - no, please)
4. Design By Contract like in Eiffel (C++ / Java 1.4 assert is not enough)
Design by contract (DBC) is a method whose author is Bertrand Mayer, also maker of OOPL language Eiffel
(Eiffel was designed in 1985, commercialy released in 1986, ISO-standardized in 2006).
Simplified, DBC is based on principle that in each routine (procedure or function) with standard code,
two additional parts – PRECONDITION and POSTCONDITION - need to be asserted.
An additional assertion in class is called INVARIANT.
Contract is based on routine's putting up an obligation to caller (to some other routine)
to satisfy conditions of precondition and conditions of invariant, and hers (called routine's) obligation
to satisfy conditions of postcondition and conditions of invariant.
The object oriented Eiffel programming language was created to implement DBC.
For now, other OO (object-oriented) languages don’t support directly the ideas behind DBC.
However, precondition and postcondition are applicable to many programming languages, both OO and not OO.
Invariants are applicable only in OOPL.
This is my attempt to use DBC methodology (including invariants) in Oracle PL/SQL.
Eiffel class interface (not like Java interface, but more like PL/SQL package specification)
from Bertrand Meyer's book "Object oriented software construction", second edition (OOSC2), 1997, page 390-391:
class interface STACK [G]
creation make
feature -- Initialization
make (n: INTEGER) is -- Alocate stack for a maximum of n elements
    require
      non_negative_capacity: n >= 0
    ensure
      capacity_set: capacity = n
    end
feature -- Access
capacity: INTEGER -- Maximum number of stack elements
count: INTEGER -- Number of stack elements
item: G is -– Top element
    require
      not_empty: not empty
    end
feature -- Status report
empty: BOOLEAN is –- Is stack empty?
    ensure
      empty_definition: Result = (count = 0)
    end
full: BOOLEAN is –- Is stack full?
    ensure
      full_definition: Result = (count = capacity)
    end
feature -- Element change
put (x: G) is –- Add x on top
    require
      not_full: not full
    ensure
      not_empty: not empty
      added_to_top: item = x
      one_more_item: count = old count + 1
    end
remove is -– Remove top element
    require
      not_empty: not empty
    ensure
      not_full: not full
      one_fewer: count = old count - 1
    end
invariant
count_non_negative: 0 <= count
count_bounded: count <= capacity
empty_if_no_elements: empty = (count = 0)
end -– class interface STACK
-- PL/SQL "equivalent":
-- Stack implementation - TABLE of INTEGER.
-- Eiffel has generic classes (like C++ templates and better than Java generics).
-- PL/SQL (now) has not generic classes or generic packages.
CREATE OR REPLACE TYPE array_t AS TABLE OF INTEGER
-- utility package:
CREATE OR REPLACE PACKAGE dbc AS
-- 0 = no check
-- 1 = check preconditions
-- 2 = check preconditions + postconditions
-- 3 = check preconditions + postconditions + invariants
c_no_check                  CONSTANT INTEGER := 0;
c_check_preconditions       CONSTANT INTEGER := 1;
c_check_pre_postconditions CONSTANT INTEGER := 2;
c_check_pre_post_invariants CONSTANT INTEGER := 3;
FUNCTION check_preconditions       RETURN BOOLEAN;
FUNCTION check_pre_postconditions RETURN BOOLEAN;
FUNCTION check_pre_post_invariants RETURN BOOLEAN;
PROCEDURE set_level (p_level INTEGER);
PROCEDURE display_error (p_error VARCHAR2);
END;
CREATE OR REPLACE PACKAGE BODY dbc AS
m_level INTEGER := c_no_check;
FUNCTION check_preconditions RETURN BOOLEAN IS
BEGIN
    IF m_level >= c_check_preconditions THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
FUNCTION check_pre_postconditions RETURN BOOLEAN IS
BEGIN
    IF m_level >= c_check_pre_postconditions THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
FUNCTION check_pre_post_invariants RETURN BOOLEAN IS
BEGIN
    IF m_level >= c_check_pre_post_invariants THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
PROCEDURE set_level (p_level INTEGER) IS
BEGIN
    IF p_level NOT IN
      (c_no_check, c_check_preconditions, c_check_pre_postconditions, c_check_pre_post_invariants)
    THEN
      RAISE_APPLICATION_ERROR (-20000, 'Wrong checking level');
    END IF;
    m_level := p_level;
END;
PROCEDURE display_error (p_error VARCHAR2) IS
BEGIN
    RAISE_APPLICATION_ERROR (-20000, 'ERROR in method ' || p_error);
END;
END;
CREATE OR REPLACE TYPE stack AS OBJECT (
-- Maximum number of stack elements
capacity INTEGER,
-- Number of stack elements
el_count INTEGER,
-- Stack implementation
stack_implementation array_t,
-- Alocate stack for a maximum of n elements
CONSTRUCTOR FUNCTION stack (n INTEGER) RETURN SELF AS RESULT,
-- Top element
MEMBER FUNCTION item (SELF IN OUT stack) RETURN INTEGER,
-- Is stack empty?
MEMBER FUNCTION empty RETURN BOOLEAN,
-- Is stack full?
MEMBER FUNCTION full RETURN BOOLEAN,
-- Add x on top
MEMBER PROCEDURE put (x INTEGER),
-- Remove top element
MEMBER PROCEDURE remove,
-- INVARIANTS
-- Note:
-- If subprogram is declared in an object type body (in PL/SQL 8i/9i/10g)
-- it must be defined in the object type specification too.
MEMBER FUNCTION count_non_negative RETURN BOOLEAN,
MEMBER FUNCTION count_bounded RETURN BOOLEAN,
MEMBER FUNCTION empty_if_no_elements RETURN BOOLEAN,
MEMBER PROCEDURE check_invariants
) NOT FINAL;
CREATE OR REPLACE TYPE BODY stack AS
CONSTRUCTOR FUNCTION stack (n INTEGER) RETURN SELF AS RESULT IS
BEGIN
    IF dbc.check_preconditions AND n < 0 THEN
      dbc.display_error ('stack - PRE');
    END IF;
    check_invariants;
    capacity := n;
    stack_implementation := array_t();
    stack_implementation.EXTEND (n);
    IF dbc.check_pre_postconditions AND capacity <> n THEN
      dbc.display_error ('stack - POST');
    END IF;
    check_invariants;
END;
MEMBER FUNCTION item (SELF IN OUT stack) RETURN INTEGER IS
BEGIN
    IF dbc.check_preconditions AND empty THEN
      dbc.display_error ('item - PRE');
    END IF;
    check_invariants;
    RETURN stack_implementation(el_count);
END;
MEMBER FUNCTION empty RETURN BOOLEAN IS
BEGIN
    IF el_count = 0 THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER FUNCTION full RETURN BOOLEAN IS
BEGIN
    IF el_count = capacity THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER PROCEDURE put (x INTEGER) IS
BEGIN
    IF dbc.check_preconditions AND full THEN
      dbc.display_error ('put - PRE');
    END IF;
    check_invariants;
    el_count := el_count + 1;
    stack_implementation(el_count) := x;
    -- PL/SQL has not Eiffel's OLD
    -- one_more_item: count = old count + 1
    IF dbc.check_pre_postconditions AND (empty OR item <> x) THEN
      dbc.display_error ('put - POST');
    END IF;
    check_invariants;
END;
MEMBER PROCEDURE remove IS BEGIN
    IF dbc.check_preconditions AND empty THEN
      dbc.display_error ('remove - PRE');
    END IF;
    check_invariants;
    el_count := el_count - 1;
    -- PL/SQL has not Eiffel's OLD
    -- one_fewer: count = old count - 1
    IF dbc.check_pre_postconditions AND full THEN
      dbc.display_error ('remove - POST');
    END IF;
    check_invariants;
END;
-- INVARIANTS
MEMBER FUNCTION count_non_negative RETURN BOOLEAN IS
BEGIN
    IF el_count >= 0 THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER FUNCTION count_bounded RETURN BOOLEAN IS
BEGIN
    IF el_count <= capacity THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER FUNCTION empty_if_no_elements RETURN BOOLEAN IS
BEGIN
    IF empty AND (el_count = 0)
       OR
       NOT empty AND (el_count <> 0)
    THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER PROCEDURE check_invariants IS
BEGIN
    IF NOT dbc.check_pre_post_invariants THEN
      RETURN; -- without checking invariants
    END IF;
    IF NOT count_non_negative THEN
      dbc.display_error ('INVARIANT count_non_negative');
    END IF;
    IF NOT count_bounded THEN
      dbc.display_error ('INVARIANT count_bounded');
    END IF;
    IF NOT empty_if_no_elements THEN
      dbc.display_error ('INVARIANT empty_if_no_elements');
    END IF;
END;
END; -- class body STACK
/Regards,
Zlatko Sirotic

Object Orientes extension

I am relatively novice to ABAP/4. Please let me know whats the concept of Oject Oriented Extension In ABAP.

Hi Bharat,
Welcome to SDN.
ABAP Objects is a new concept in R/3 Release 4.0. The term has two meanings. On the one hand, it stands for the entire ABAP runtime environment. On the other hand, it represents the object-oriented extension of the ABAP language.
<b>The Runtime Environment</b>
The new name ABAP Objects for the entire ABAP runtime environment is an indication of the way in which SAP has, for some time, been moving towards object orientation, and of its commitment to pursuing this line further. The ABAP Workbench allows you to create R/3 Repository objects such as programs, authorization objects, lock objects, Customizing objects, and so on. Using function modules, you can encapsulate functions in separate programs with a defined interface. The Business Object Repository (BOR) allows you to create SAP Business Objects for internal and external use (DCOM/CORBA). Until now, object-oriented techniques have been used exclusively in system design, and have not been supported by the ABAP language.
<b>The Object-Oriented Language Extension</b>
ABAP Objects is a complete set of object-oriented statements that has been introduced into the ABAP language. This object-oriented extension of ABAP builds on the existing language, and is fully compatible with it. You can use ABAP Objects in existing programs, and can also use "conventional" ABAP in new ABAP Objects programs.
ABAP Objects supports object-oriented programming. Object orientation (OO), also know as the object-oriented paradigm, is a programming model that unites data and functions in objects. The rest of the ABAP language is primarily intended for structured programming, where data is stored in a structured form in database tables and function-oriented programs access and work with it.
The object-oriented enhancement of ABAP is based on the models of Java and C++. It is compatible with external object interfaces such as DCOM and CORBA. The implementation of object-oriented elements in the kernel of the ABAP language has considerably increased response times when you work with ABAP Objects. SAP Business Objects and GUI objects - already object-oriented themselves - will also profit from being incorporated in ABAP Objects.
For more information, please check this link.
https://www.sdn.sap.com/irj/sdn/developerareas/abap?rid=/webcontent/uuid/35eaef9c-0b01-0010-dd8b-e3b0f9ed7ccb [original link is broken]
Hope this will help.
Regards,
Ferry Lianto
Please reward points if helpful.

Regarding object oriented concept

hai i am a student..
i just want to know the opnions of everybody...
considering todays object oriented language what will be the future language features? (for example if u consider c language which is basis for c++.. it has polymorphism ,inheritance, encapsulation. etc features..which are not found in c).. if the future language design from c++ or java ,what will be its new concepts ?. i mean will be the new features..
do anybody find any flaws in todays oo language ..do any body have new ideas on basic concepts of oo design to be improved
i know this is very crazy.. i just want to know your ideas..

And the cross posting multi posting fiesta continues.
http://forum.java.sun.com/thread.jspa?threadID=692984&tstart=0
sr1_reddy stop posting this garbage please.

TO KNOW WHAT EXACTLY OBJECT ORIENTED PROGRAMMING

IS JAVA AN OBJECT ORIENTED PROGRAMMING LANGUAGE? WHAT ARE THE PARAMETERS WHICH DESCRIBES THE TERM "OBJECT ORIENTED LANGUAGE" ? WHAT IS EXACTLY OBJECT ORIENTED PROGRAMMING(WITH EXAMPLES).

Nikh4ever wrote:
IS JAVA AN OBJECT ORIENTED PROGRAMMING LANGUAGE?Yes.
Nikh4ever wrote:
WHAT ARE THE PARAMETERS WHICH DESCRIBES THE TERM "OBJECT ORIENTED LANGUAGE" ? WHAT IS EXACTLY OBJECT ORIENTED PROGRAMMING(WITH EXAMPLES).[http://en.wikipedia.org/wiki/Object-oriented_programming]
BTW - why are you shouting ... or is your keyboard broken?

IS Java Is puer Object Oriented Language

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