JList problem

[axel axek]

I am having problems reading from a JList, my application consists in adding text line by line from a text file to a JList, ..and the problem that i am facing is...how can i read elements from Jlist, character by character .... help please....

[axel axek]

this is the code that reads form txt:
where "model" is Jlist model

  # try { if(grm==1) { FileReader file = new FileReader("gramatica1.txt");  
            BufferedReader buff = new BufferedReader(file);  
            boolean eof = false;  
            while (!eof) {  
                 String line = buff.readLine();  
                 if (line == null)  
                    eof = true;  
                else  
                      
                     model.addElement(String.valueOf(line));  

and i have tried to read from list:
the line i'm tryng to read is something like: "S LLLL 0.2"

    
 s1=String.valueOf(model.getElementAt(0)); //because i need only the first line here  
         for(k=0;k<s1.length();k++) {  
             ch=s1.charAt(k);      
 //...........................................  
 for(j=1;j<model.getSize();j++) {                  
             System.out.println(model.getElementAt(0)); //verifing  
               
             s1=String.valueOf(model.getElementAt(j));   
             //...........  
               
             k=2; //because character nr 1 is a ' '(space)  and don't need in my application  
            ch=s1.charAt(k);  
             while (ch!=' ') {  
                //.....stuff  
                  k++;  
                ch=s1.charAt(k); //and here i get some error like Exception in thread "AWT-EventQueue-0" java.lang.StringIndexOutOfBoundsException: String index out of range:   
                                         // don't know why  
                   
             }

[Rob Camick]

String index out of range: 

Because you are trying to access a character in the string that doesn't exist. I don't know the format of your data, but maybe you have a blank line.

In any case you should be using the String.length() method to control the looping.

[James Dixon]

I have to say it is a bit difficult to follow your code as it doesn't seem to be complete (for instance where do the for loops for k and j finish?).
But looking at the code as it stands and at the error message it is basically saying that you are trying to reference a part of the string ('s1') that does not exist. You should be able to see this if you output the length of the string 's1' and the value of k where it fails (you'll probably find that k >= s1.length()).

<hint>Remember that String.charAt(int) references the string as it would a list so characters are retreived from position 0 rather than 1.</hint>

Also not sure if you have been asked to use for loops for your project but if not you may want to have a look in using StringTokenizer, this should take a lot of the pain out of what you are trying to do.

Have fun...