StringTokenizer 中不需要的行为

Question

I have a String Result = "FFF-556-GHH-788;DDR4TG441" . I use StringTokenizer to split the string on delimeter ';'. But the 2 sub-Strings I get are 1->"FFF-556-GHH-788" and 2->"DDR4TG441DDR4TG441DDR4TG441" . Why is String 2 repeated 3 times?

code: main:

datum = parseResult(Result);

fun:

public QRResultData parseResult(String Result)
    {
        QRResultData data = new QRResultData();
        StringTokenizer multiTokenizer = new StringTokenizer(Result, ";");

        if(multiTokenizer.hasMoreTokens())
        {
            data.busNumber = multiTokenizer.nextToken();
        }

        if(multiTokenizer.hasMoreTokens())
        {
            data.seatNumber = multiTokenizer.nextToken();
        }
        return data;
    }

Answer 1

Odd, when I ran your code it works. Can you verify that the code in your question matches the code in production?

import java.util.StringTokenizer;

public class So66650493 {

    public static void main(String[] args) {
        String Result = "FFF-556-GHH-788;DDR4TG441";
        final QRResultData datum = new So66650493().parseResult(Result);
        System.out.println("datum = " + datum);
        // datum = QRResultData{busNumber='FFF-556-GHH-788', seatNumber='DDR4TG441'}
        if ("FFF-556-GHH-788".equals(datum.busNumber)
                && "DDR4TG441".equals(datum.seatNumber)) {
            System.out.println("SUCCESS parsed correctly");
        } else {
            System.out.println("FAIL");
        }
    }

    public QRResultData parseResult(String Result) {
        QRResultData data = new QRResultData();
        StringTokenizer multiTokenizer = new StringTokenizer(Result, ";");
        if (multiTokenizer.hasMoreTokens()) {
            data.busNumber = multiTokenizer.nextToken();
        }
        if (multiTokenizer.hasMoreTokens()) {
            data.seatNumber = multiTokenizer.nextToken();
        }
        return data;
    }

    private static class QRResultData {
        String busNumber;
        String seatNumber;

        @Override
        public String toString() {
            return "QRResultData{" +
                    "busNumber='" + busNumber + '\'' +
                    ", seatNumber='" + seatNumber + '\'' +
                    '}';
        }
    }

}

My earlier suggestion to replace StringTokenizer with String.split will not help you much. But it would make your code slightly more legible.

public QRResultData parseResult(String Result) {
    QRResultData data = new QRResultData();
    String[] split = Result.split(";");
    data.busNumber = split[0];
    if (split.length > 1) {
        data.seatNumber = split[1];
    }
    return data;
}