Why Java allows multiple inheritance from interfaces, but not from abstract / concrete classes

Question

Possible duplicate:
Why there is no multiple inheritance in Java, but multiple interfaces are allowed

Why Java allows multiple inheritance from interfaces, but not from abstract or concrete classes

Answer 1

Multiple inheritance of specific classes raises many problems .

For example, what if a class inherits two different implementations of the same method from two different base classes?

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Answer 2

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Answer 3

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Answer 4

Make the language simpler and more elegant. C ++ allows a lot of things, but there is often pain to learn and use. We (I, at least :)) do not want java to be like that.