StrTokDemo4.java

import java.util.*; /** Show using a StringTokenizer including getting the delimiters back */ public class StrTokDemo4 { public final static int MAXFIELDS = 5; public final static String DELIM = "|"; /** Processes one String; returns it as an array of Strings */ public static String[] process(String line) { String[] results = new String[MAXFIELDS]; // Unless you ask StringTokenizer to give you the tokens, // it silently discards multiple null tokens. StringTokenizer st = new StringTokenizer(line, DELIM, true); int i = 0; // stuff each token into the current slot in the array while (st.hasMoreTokens( )) { String s = st.nextToken( ); if (s.equals(DELIM)) { if (i++>=MAXFIELDS) // This is messy: See StrTokDemo4b which uses // a Vector to allow any number of fields. throw new IllegalArgumentException("Input line " + line + " has too many fields"); continue; } results[i] = s; } return results; } public static void printResults(String input, String[] outputs) { System.out.println("Input: " + input); for (int i=0; i<outputs.length; i++) System.out.println("Output " + i + " was: " + outputs[i]); } public static void main(String[] a) { printResults("A|B|C|D", process("A|B|C|D")); printResults("A||C|D", process("A||C|D")); printResults("A|||D|E", process("A|||D|E")); } }