java - Replacing String parts -

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this topic has been discussed here lot, none of solution worked me. want replace part of string, got html. getting , displaying html works fine, cann't remove parts of string. acts doesn't find it.

please, have @ code bellow:

public class main extends activity {  public static string url = ""; public static string htmlstring; public textview maintext;  protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main_layout);      maintext = (textview) findviewbyid(r.id.maintext);      constructurl();     gethtml();      htmlstring.replaceall("<head>", "hulo");      maintext.settext(htmlstring); }  public void gethtml() {     try {         httpclient httpclient = new defaulthttpclient();         httpcontext localcontext = new basichttpcontext();         httpget httpget = new httpget(url);         httpresponse response = httpclient.execute(httpget, localcontext);         bufferedreader reader = new bufferedreader(             new inputstreamreader(                     response.getentity().getcontent()                     )             );         string line = null;         while ((line = reader.readline()) != null){             htmlstring += line + "\n";         }     } catch (exception e) {     } }  public void constructurl() {     time time = new time();     time.settonow();     string year = converttostring(time.year - 2000);     string month = converttostring(time.month + 1);     string monthday = converttostring(time.monthday);      url = "http://www.gymzl.cz/bakalari/suplovani_st/tr" + year + month + monthday + ".htm"; }  public string converttostring(int value) {     string text = "";     if(value < 10) text = "0";     text += string.valueof(value);     return text; } }

the 'hulo' replacement doesn't seem work.

i sorry such long code, have tried everything.

replaceall not update calling string, need assign back. change 

htmlstring.replaceall("<head>", "hulo");

to

htmlstring = htmlstring.replaceall("<head>", "hulo");

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