Undocumented String fearute

Question

Hey
Take a look at this code and tell me where this is dosumentet i jdk.
// display the result from the search, the most frequent first.
// The string s is f.eks. /MyDocuments/test.html;Title_of_document
// put the url and the title in a hashtable
urls = new Hashtable();
for (int k = int_tbl.length-1; k>=0;k--){
String s = str_tbl[k];
int slash = s.lastIndexOf(";");
String kvasiUrl = s.substring(slash + 1,s.length());
String ss = s.substring(0,slash);
String OKUrl = new String(ss.toCharArray());
urls.put(kvasiUrl, OKUrl);
textArea.append(kvasiUrl+"\n");
}//end for
// set the current position to the first document in the list.
textArea.setCaretPosition(1);
}//end search
// display the document in the browser, the target variable in the showDocument()
// method is the target variable for html
public void mouseClicked(MouseEvent evt){
//System.out.println(textArea.getSelectedText());
if (!(textArea.getSelectedText().equals(""))){
try{
String t = textArea.getSelectedText();
String s = (String)urls.get(t);
String mmm = getCodeBase().toString()+s;
String s3 = new String(mmm.toCharArray());
String s2 = new String(getCodeBase().toString()+s);
URL url = new URL(s3);
getAppletContext().showDocument(url,"_blank");
// This will result in the following c:\User\Myloginname\NULL
// the null part represents the variable s
// the former part is the codebase
// but a System.out.println(url.toString()) will print
// c:\User\Myloginname\MyDocuments\test.html
}catch(MalformedURLException ext){
ext.printStackTrace();
}//end try catch
}//end if
}//end mouseClicked
I have heard erlier that the String concat often can cause problem and the solution is to make a new string with the toCharArray or getBytes in the constructor, but this does not help in this situation. Thats why I've tried with both the s2 and s3 string.
Have anyone else encountered this problem??Or read something about it that can help me?
TheLaw

Answer 1

Well
I thought that was the problem too, but by testing the code with variuos println to screen I found that it was not the problem.
To make it easier to read
String s = (String)urls.get(t);
This code does not return null(i.e, s != null)
String mmm = getCodeBase().toString()+s;
URL url = new URL(mmm);
getAppletContext().showDocument(url,"_blank");
System.out.println(url.toString());
-> c:\MyDocuments\Myloginname\Test\test.html
but the new IExplorer that is open has a url
-> c:\MyDocuments\Myloginname\NULL
c:\MyDocuments\Myloginname\ is the codebase
NULL should be the s string.
and it is not an IExplorer error.
I have tried this before but it did not fail but it does now and i think the reason is that the value of the hashtable is generated as a substring from an another string, that is the only diffrense between this nonfunctioning code and the other code. I this the problem occur when i try to concatinate the string s with the codeBase toString.
Thanks trying to solve the problem
TheLaw