How do I replace one ' (Single Quote) with '' (Two single Quote)

Hi,
I have been surfing around the forum, coudn't find the similiar case.
I have been trying but fail. Below is my code:
activity = request.getParameter("activity");
activity = activity.replace("\'", "\'\'");
Error Occur:
Incompatible type for method. Can't convert java.lang.String to char. activity = activity.replace("\'", "\'");
I'm trying to use replaceAll(), but seem like the method is not existed, we are using Version Java 1.3
Pls advise.
Regards
Ying

For JDK 1.3 or ealier, use this:
public static String replaceSubstrings(String str, String sub, String rep){
    int s, p, q;
    int slen = sub.length();
    StringBuffer sb = new StringBuffer();
    s = 0;
    p = str.indexOf(sub);
    q = p + slen;
    while (p != -1){
      sb.append(str.substring(s, p));
      sb.append(rep);
      s = q;
      p = str.indexOf(sub, s);
      if (p != -1){
        q = p + slen;
    sb.append(str.substring(s));
    return sb.toString();
activity = replaceSubstrings(activity, "'", "''");

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