Java’s interface language feature confuses many Java newbies. Many mistakenly assume that interfaces only sidestep Java’s failure to support multiple implementation inheritance. In reality ...

Unlike some languages, such as C++, Java does not allow multiple inheritance with classes. ... Common mistakes with Java inheritance. Writing inheritance code before thinking it through carefully.

It seems that MI has fallen severely out of favor. Neither of the two "big" programming languages to come out in the last few years, Java or C#, make use of multiple implementation inheritance ...