His comment was: “Implementation inheritance explicitly ... package dustin.examples; import java.math.BigDecimal; /** * Demonstrating the troubles with non-final 'immutable' classes.

The first half of this introduction to Java inheritance ... method overloading Inheritance can descend through multiple levels, leading to ever-more-specific categories. As an example, Figure ...

Java's open inheritance model can feel like an open invitation ... public final class TimesExpr implements Expr { } public final class NegExpr implements Expr { } For example, if we want to write the ...