Java Tracery Recursion

import java.io.*; import java.util.*; import java.util.Random; /* * A rule is an object with alternating plaintext and symbols. This class is used to store the expansion on the righthand * side of a rule. The starting symbol is also represented using a Rule object. The main thing you do with a Rule object * is expand any symbols that appear in it looking up the rule indexed by the symbol. */ public class Rule { private static Random random; // The raw expansion string. It can include a mixture of text and symbols (hashtagged text) private String raw; // Array with text and symbols as separate entries private String[] sections; public static void setSeed(long seed) { System.out.println("Set seed " + seed); random = new Random(seed); // Create a new random number generator with the specified seed } public String expand(Hashtable<String, Rule[]> grammar) { /* * START: TO DO #3 */ return "[" + raw + "]"; /* * END: TO DO #3 */ } public String toString() { return raw; } Rule(String raw) { this.raw = raw; sections = raw.split("#"); } }