import java.util.*;

/** 使用 StringTokenizer 类 */
public class StrTokDemo4 {
        public final static int MAXFIELDS = 5;
        public final static String DELIM = "|";

        /** 处理一个字符串，返回一个由各字段组成的数组 */
        public static String[] process(String line) {
                String[] results = new String[MAXFIELDS];

                // 除非你要求StringTokenizer类，否则它会丢弃许多null标记
                StringTokenizer st = new StringTokenizer(line, DELIM, true);

                int i = 0;
                // 获得每个token
                while (st.hasMoreTokens()) {
                        String s = st.nextToken();
                        if (s.equals(DELIM)) {
                                if (i++>=MAXFIELDS)
                                        // 这有些乱：参照StrTokKemo4b,它使用一个Vector
                                        // 允许任何数量的字段
                                        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"));
        }
}