Thinking Recursively With Java By Eric Roberts Pdf 16 !!better!! Review

: The ability to break the original problem into simpler instances of itself.

, if you clarify what you actually need — e.g.: Thinking Recursively With Java By Eric Roberts Pdf 16

public class Factorial public static int factorial(int n) if (n < 0) throw new IllegalArgumentException(); if (n == 0) return 1; // base case (page 16 style) return n * factorial(n - 1); // recursive case : The ability to break the original problem

Java has evolved (Generics, Lambdas, Streams). Recursion has not. The code on page 16 of Roberts' PDF is likely raw, pre-Java 5 code. It does not use var or functional constructs. Is that bad? No. In fact, barebones Java is better for recursion because it forces you to visualize the stack manually. The absence of syntactic sugar makes the logic naked. 0) throw new IllegalArgumentException()