Question

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Why there is no multiple inheritance in Java, but implementing multiple interfaces is allowed

hi all, I am new to java and when I am try to use multiple inheritance concept in java its showing a compile time error.Why java does not support it.I heard about interface key word but
do not know why java support it directly. please help me in this and explain.

Answer 1

Multiple inheritance can be really difficult to understand. When you have a multiple inheritance with two classes which have methods in conflicts, how do you handle this ?

Of course solutions exist (in C++ for example) but the creators of Java decided it was way to complicated and not really in the Java philosophy (make development a lot easier).

From sun.com :

Multiple inheritance–and all the problems it generates–was discarded from Java. The desirable features of multiple inheritance are provided by interfaces–conceptually similar to Objective C protocols.
An interface is not a definition of a class. Rather, it’s a definition of a set of methods that one or more classes will implement. An important issue of interfaces is that they declare only methods and constants. Variables may not be defined in interfaces.

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Resources :

• The Java Language Environment