Java’s single inheritance limitation is usually not a problem in the normal course of development. In fact, the need to use multiple inheritance could be a sign of a bad design.

Inheritance can descend through multiple levels, leading to ever-more-specific categories. As an example, Figure 1 shows car and truck inheriting from vehicle; station wagon inheriting from car ...

So rarely have I wished for multiple implementation inheritance in Delphi or Java, that I can't recall what I needed. I only vaguely recall getting round it using composition.