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Thread: Inheritance

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    Junior Member vasanthjayaraman's Avatar
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    Default Inheritance

    Hi Guys:-
    Why Multiple Inheritance not Supported in Java?

    I Need Clear Definition Please Anyone Help me...........................


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    Default Re: Inheritance

    This sub-Forum is titled "What's Wrong With My Code?", meaning there should be questions involving code. Your question is about Java theory, so the sub-forum "Java Theory And Questions" seems more suitable.

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    Default Re: Inheritance


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    Default Re: Inheritance

    Thread moved from Whats wrong with my code

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    Default Re: Inheritance

    The technical answer would be due to inheritance meaning an "is-a" relationship (you can find a bunch of information regarding this online).

    But the practical answer would be simply because multiple inheritance is one of those things which has an extremely rare need, but is extremely common to be abused (refer to some of the multiple inheritance articles for C++). Basically, the idea is that multiple inheritance encourages developers to inherit classes for the purpose of reusing code, instead of the actual purpose of inheritance, which is relationship mapping. Generally speaking, if you find your class needs to inherit more than one object, you should probably consider refactoring.
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    Default Re: Inheritance

    Multiple inheritance has to solve the Diamond Problem.

    The safest and easiest solution to this problem while keeping most of the benefits of complete multiple inheritance is to ensure every "class" multiply inherited from has no data members, and no defined methods (a.k.a. contains only abstract methods). This is called an "interface". So what you end up with is the ability for single inheritance and multiple interfaces, a reduced form of multiple inheritance.

    Java's design reasoning is that this pattern solves the vast majority of problems while avoiding the Diamond Problem, and calls it a day. So yes, you are crippled in what you can do, but it's probably for your own good (this is the reason for quite a few features of the Java language).

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