single inheritance

In Java, a class may not extend more than one class. This means that Java has a single inheritance model for class inheritance. See multiple inheritance for the alternative.

The features you got from your mother, if she told you that you don't have a father. (See also "inheritance" and "multiple inheritance".) In computer languages, the notion that classes reproduce asexually so that a given class can only have one direct ancestor or "base class". Perl supplies no such restriction, though you may certainly program Perl that way if you like.