Maximizing code reuse in your Java programs means writing code that is easy to read ... you must know how to break it down so that each class and method does one thing well.

public final class NegExpr implements Expr { } For example, if we want to write the following class and try to compile it, we get the following error: javac DivideExpr.java DivideExpr.java:1: error: ...

a Python programmer must write the following cryptic and verbose code: Java has always been easy to learn, but it’s encouraging to see the stewards of the language continue to lower the barrier to ...