How Java does not support multiple inheritance

Hi,
I have got a small doubt....
Generally it is said thatjava does not support multipleinheritance.I agree.
But then we know that every class in java by default is a sub class of Object class then how is it possible to inherit one more class using extends keyword.
I am confused?
Akshatha

Generally it is said thatjava does not support
multipleinheritance.I agree.Generaly, this is wrong. Java does support MI, just not MI of implementation. You can extend as many interfaces as you like.
But then we know that every class in java by default
is a sub class of Object class then how is it
possible to inherit one more class using extends
keyword.It is not possible. You can only extend directly from one single class. If you extend from something else than Object, you're not directly extending Object anymore.

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Why java does not support multiple inheritance ???

Hai friends ..iam new to java .. i have doubt ..plz help me
Why java does not support multiple inheritance ???

The reasons for omitting multiple inheritance from the Java language mostly stem from the "simple, object oriented, and familiar" goal.
To understand multiple inheritance, the learner needs some level of expertise like virtual derivations etc in c++. Multiple inheritance will allow method duplication, and throws the learner into confusion which method might be called by the compiler in which scenario at run time.
Even though this answer seems to be funny, this is the actual reason why java omitted multiple inheritance of classes.
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Let's Be Honest / Save Time: Lenovo T430s (NVIDIA) DOES NOT Support Multiple Monitors

There have been a few comments / complaints / articles around the web regarding the T430s and difficulties using multiple monitors.
But since this capabilitiy is clearly documented in all of Lenovo's specifications and marketing literature, I went ahead and bought an i7, NVIDIA, SSD, T430s with the docking station and all the bells and whistles to facilitate 3 or even 4 monitors.
Well please listen and let's be clear: IT DOES NOT WORK. Therefore, to be clear:
DO NOT BUY THIS MACHINE AND DOCK IF YOU WANT IT TO LIVE UP TO ITS MULTI MONITOR PROMISE.
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5) Muliple parties have confirmed that yes, all hardware is working and yes, everything can be seen in device manager, and yes, the NVIDA card is properly switched on in the BIOS, yes I bought the i7 version etc.
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7) Yes, we tried every connector in the dock AND the laptop: VGA, DVI, DP and mini DP - in EVERY possible combination.
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I too am a die hard old school Thinkpad enthusiast and with the company's service could match their classic products.
I have an X201 that I generall love, but would appreciate more speed, an SSD and I have to drive at least 3 external monitors, using at least 1920 x 1080 resolution.
Perhaps a W series Thinkpad would work, but I also travel so going up to the T430s was already a sacrifice vs the small size of the X201.
There are some 3rd party solutions but they are expensive and not so sure how plug and play they are with 3 or more monitors - what the T430s and Mini Dock 3.0 are SUPPOSED TO DO. But they dont.
Not giving up yet, but this has been a real bummer.
PS
Lenovo was very focused, efficient, and uncompromising when charging my CC for "premium" support.
Solved!
Go to Solution.

Thors,
Thank you and happy to report, albeit after all the hours and now weekend number 3:
1) For the moment, I am able to repeat the 3 screen performance using mini DP from the Thinkpad and 2 DPs from the dock to the external monitors
AND
2) For the first time ever, I am just now for the first time running the 3rd external monitor from the VGA port on the dock.
That is what I meant by using the various ports on the dock, so that the Thinkpad can simply be docked and undocked without connecting the mini DP - the purpose of a dock obviously. As stated in other threads and articles, various configurations of the dock ports supposedly work to achieve 3 external screens, but until today was not able to do this.
That is the good news and thank you for all help.
The bad news is I stil have no clear idea why this has been so difficult, or where the problem lives that consumed so many hours of my own time and many hours with Lenovo tech support as stated above.
Some success seems to have happened only after more than one set of LONG updates to Windows 7 (?)
If I can replicate this set up the office (where I have 3 of the same monitors) I will be almost there.
Thank you again to all for help and support.

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How java support multiple inheritance by the use of interface.

As per my understanding, Interface is just having the signatures of the methods not the implementation.
So How java support multiple inheritance by the use of interface?
Answer 1: we can institate interface reference by its implemented
class.
          �� interface inf...
          �� class aa implements inf..
          �� class bb implements inf....
           Now, inf i = new aa();
           inf i = new bb();
Answer 2: We can extends as many interface as we want in the
single
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           interface infSecond....
           interface infThird....
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-Jeff

The keyword implement is used only for interfaces not
for abstract class. If i am wrong correct me.I believe your right, but I will double check.
As for the multiple inheritence think about the following code:
class Animal {
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interface Eat {
    // Generic stuff that models eating behavior
interface Runs {
    // generic methods that model running behavior
public class Horse extends Animal implements Eat, Runs {
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}The Animal class is generic but has stuff in it common to all animals.
The Eat interface models behavior that is generic to eating, all living things have to eat something to survive. Herbavore are different from carnivores.
The Runs interface models generic behavior to running, such as speed. A cheeta definately runs faster than a human.
This brings us to the Horse class. It extends the Animal class because it "is-a" animal, and it implements the eat and runs interface because they are behaviors a horse has.
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JJ

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Hi All , Will Java supports Multiple Inheritance classes???

Hi All ,
Will Java supports Multiple Inheritance by classes???
Thanks in advance,
Prakash

No, Multiple inheritance would look like
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Java just guarantees that nothing bad can happen to you by only allowing multiple inheritance of interface. You can't ever have multiple inheritance of implementation, that's all.
%

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