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Multiple inheritance means subclassing from multiple classes.
Java doesn't support it for simplicity.
For example,
Class A
{
int a;
}
Class B
{
int a;
}
now as both the classes have variable a if class C inherits from both of them it makes it unnecessarily complex and you need to determine variable a of which class.
You can implement something similar to multiple inheritance using interface.

Multiple inheritance means >>>
extends class plus implements interface

Multiple inheritance in Java is possible using interfaces. Diamond problem is the main reason for not having multiple inheritance thro classes in Java.

Multiple inheritance in Java is possible using interfaces. Diamond problem is the main reason for not having multiple inheritance thro classes in Java.

raghu rightly mentioned that Java avoids multi-inherit because of the inFamous diamond problem...

as mentioned in the above example... Java don't have it since it want to avoid ambiguity ( Diamond formation problem ).

Give two fixed class having common variable or implementation. You can achieve multiple inheritance by using composition of one class and inheritance of other.

choice depends on which class has more methods to delegate. that becomes inheritance base class.