Groups > comp.lang.java.programmer > #32622

Re: can you give me some hints on the Oracle Java SE related certificates?

From	Jeff Higgins <jeff@invalid.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: can you give me some hints on the Oracle Java SE related certificates?
Date	2015-09-21 21:47 -0400
Organization	A noiseless patient Spider
Message-ID	<mtqbv8$v7r$1@dont-email.me> (permalink)
References	(4 earlier) <4245d965-6d79-4bdf-accd-dc51520d3273@googlegroups.com> <mti4pt$igj$1@dont-email.me> <313f817e-9d7c-4939-a971-7e2b2a85d35f@googlegroups.com> <mtjppt$g5v$1@dont-email.me> <430f5ded-3382-476a-ae5e-ef12427e1542@googlegroups.com>

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On 09/21/2015 04:57 PM, John wrote:
> On Saturday, September 19, 2015 at 10:02:34 AM UTC-4, Jeff Higgins wrote:
>> On 09/18/2015 11:23 PM, John wrote:
>>> On Friday, September 18, 2015 at 6:58:12 PM UTC-4, Jeff Higgins wrote:
>>>> On 09/18/2015 02:11 PM, e.d.programmer@gmail.com wrote:
>>>>> On Friday, September 18, 2015 at 1:52:38 PM UTC-4, Jeff Higgins wrote:
>>>>>> How will Oracle Java SE certificates make your students more valuable.
>>>>>> How much more valuable? More valuable to whom? Who says?
>>>>>>
>>>>>> ----
>>>>>
>>>>> Assuming they're not going to be self employed, the value is to a potential employer, which is hard to quantify because potential employers are not required to send rejection letters.  If you have a certification you're going to be far below someone with a US 4 year college degree in the programming field, unless you have a comparable degree, then that certification tagline could bump you ahead of them.
>>>>> Just read the description of the certification and be sure it applies to the job you want or it may just be a waste of money.
>>>>>
>>>>
>>>> I'm concerned that the topic of Java Certification didn't come
>>>> up during an interview for the position of "Java instructor of
>>>> computer science in a local college in a developing country in Asia"
>>>>
>>>> As a student trying to decide whether to enroll in a course led
>>>> by the OP I would have been grateful for a pointer to this thread.
>>>
>>> Jeff:
>>> If you really have nothing better to do, here is one Java SE question for you:
>>> Can you explain to me why Java cannot have multiple inheritance? Please note, I am asking WHY. This is Java 101 question. I am sure you look shining when my future students look at your answer on this thread, or the opposite way. One of the other.
>>>
>> For some of your more curious students you might point to
>> the chapter titled "Data Abstraction and Object Orientation"
>> in:
>>
>> Scott, Michael L. Programming Language Pragmatics.
>> San Francisco: Morgan Kaufmann, 2000.
>>
>> You may see all editions here:
>> <http://www.cs.rochester.edu/~scott/pragmatics/>
>
> Wow, Jeff:
> I am asking(testing) you a question("Why Java cannot have multiple inheritance?") and you threw back to me a web link first and a book later. You are really "shining"!!!
>
> Here is my answer to the question:
>
> Suppose Java can have multiple inheritance, let's say both BaseA and BaseB are two concrete classes:
>
> public class BaseA {
>      public void sayHi(){System.out.println("Hi from A!");
> }
>
> public class BaseB {
>      public void sayHi(){System.out.println("Hi from B!");
> }
>
> public class MyClass extends BaseA, BaseB { //multiple inheritance is not allowed
>      public static void main(String[] args) {
>         MyClass c = new MyClass();
>         c.sayHi();  //Will it say "Hi from A!" or "Hi from B!"?
>      }
> }
>
> For Java, in order to achieve multiple inheritance effect, we use interface:
>
> public interface BaseC {
>      public void sayHi();
> }
>
> public class MyClass extends BaseA implements BaseC {
>
>      public void sayHi() {//MyClass must implement this method to be concrete
>         System.out.println("Hi I am here!");
>      }
>
>      public static void main(String[] args) {
>         MyClass c = new MyClass();
>         c.sayHi();  //prints "Hi I am here"
>      }
> }
>

 > public interface BaseC {
 >      public void walk();
 >      public void sayHi();
 > }
 >
 > public interface BaseD {
 >      public void jump();
 >      public void sayHi();
 > }
 >
 > public interface BaseE {
 >      public void run();
 >      public void sayHi();
 > }
 >
 > public class MyClass extends BaseA implements BaseC, BaseD, BaseE {
 >
 >      public void sayHi() {//MyClass must implement this method to be 
concrete
 >         System.out.println("Hi I am here!");
 >      }
 >      //...implementation of other methods in the interfaces
 >
 >      public static void main(String[] args) {
 >         MyClass c = new MyClass();
 >         c.sayHi();  //prints "Hi I am here"
 >      }
 > }
 >

Well, where to start? A question often pondered by authors, including
Usenet users posting or responding to articles, and Java instructors
of computer science preparing lesson plans or course notes.

Congratulations on having overcome the blank page.

What's next? Well, iteration. I'm sorry for having "thrown" links and
citations back to you, thing is, the material presented in these links
and citations has been iterated over time and again by their respective
authors, reviewed by many highly critical reviewers, and deemed to be
sound. If I were to present a discourse on "Inheritance in Java" I
would need considerably more time and motivation than I currently have.

Concerning motivation. There you have me. Unlike you, I don't give a
rat's a$$ about your future students. Well, really I do care about them
otherwise I wouldn't have responded to this article at all ....
But you, you are clearly motivated to provide your future students a
sound instruction and indeed you are concerned enough to consider their
future vocational needs such as Java Certification.

So, great start on the course notes, looking forward to the next
iteration. Hope to soon see your first draft on the topic of "Java
Certification". Carry on.

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