截取字符串。向高手请问

截取字符串。在线等，向高手请教
有一字符串 "123456,abcde "   用什么办法可以截取 ", "之前的数字。“，”之前的数字长度会变。请各位高手指教

[解决办法]
public static void main(String[] args) {
String s = "234234,asdfsd ";
StringTokenizer st = new StringTokenizer(s, "[,] ");
System.out.println(st.nextToken());
}