Line Reader changeing to read 1 line

[Javanooby]

Hi Everyone, I'm new to java and working on reading a text file into my java program. The issue with the code I have built is it only reads the text on each line and errors if there is more that one text on the line. Looking for some advice.

Here is the txt reader,
public boolean readInterestRates() { //start
boolean status = false;

try { //start
FileReader fis = new FileReader(new File("loanterms.txt"));
BufferedReader br = new BufferedReader(fis);
String line = null;

int i = 0;
while ((line = br.readLine()) != null) {
rates[i] = Double.parseDouble(line);
i++;
}
fis.close();
status = true;
} catch (Exception e) { //start
JOptionPane.showMessageDialog(this, "File Read Error!!!");
status = false;
} //end



Is it something there or how i'm trying to have a combobox display?
readInterestRates();
loanOptionBox.addItem("Select");
loanOptionBox.addItem("" + rates[0] + "%");
loanOptionBox.addItem("" + rates[1] + "%");
loanOptionBox.addItem(" " + rates[2] + "%");
loanOptionBox.addItem(" " + rates[3] + "%");
loanOptionBox.addItem("" + rates[4] + "%");
loanOptionBox.addActionListener(this);


Thanks all.

[Toll]

Well, you are trying to make a double out of the entire line you read. If there's more data (or non-numerical data), a NumberFormatException (I think) is thrown.

[Javanooby]

So the double on the rates[i] would cause the file read error if say for example its 1 2 3 4 in the text file but be ok if its input as?
1
2
3
4

[Toll]

Right. It can't make "1 2 3 4" into a single number, thus it fails. It can be solved in various ways, but it might be easier to just put them on different lines if you can.

[Javanooby]

I can't put them on different lines, but am researching for some of the other ways right now, what are some of the various ways to look at? I'm not trying to make it a single number but use the combobox to select what number to use. so i could use the combobox to pick the 3rd number out of 1 2 3 4 5.

[Toll]

I have to go, but I'll give you String (Java Platform SE 6) to read through. There are a few things in there that can help.

[Javanooby]

Thanks for your help, I'm looking it over now, won't let me change it from a double so trying to figure out ways to get around, hopefully someone else will jump in here.

[Javanooby]

Anyone else have any advice here am at the end of my rope, tried everything I could think of and search for just missing something.

Still won't read 1 line of 1 2 3 4 5 6 7 without the exception.

[Fubarable]

Check the link that Toll gave you. One method in there that might help is the split(...) method. You would call it on the String and pass in a space " " as the parameter.

[Javanooby]

Thanks, I've been trying to figure out how to input the split for awhile and its just not clicking for me.

[Junky]

You read the entire line. Call split on that line and it returns an array of Strings. Loop over that array and parse to a double.

[Javanooby]

Thanks Junky, I kind of follow what your saying but am just brain dead on this, can you give a example?

[Fubarable]

Come on -- At least try to do it first yourself based on what he said. Then post your attempt here. That's how you learn.

[Javanooby]

I have been :) this is what i got so far for split.

public boolean readInterestRates() {
        boolean status = false;

        try {
           FileReader fis = new FileReader(new File("loanterms.txt"));
            BufferedReader br = new BufferedReader(fis);
           	String[] line = br.readLine(  ).split(" ");

            for ( int i = 0; i < line.length; i++ ) {

                rates[i] = Double.parseDouble(line);
                i++;
            }
            fis.close();
            status = true;
        } catch (Exception e) {  //start
            JOptionPane.showMessageDialog(this, "File Read Error!!!");
            status = false;
        }  //end

        return status;
    }  //end

[Javanooby]

Wait maybe i got it.

public boolean readInterestRates() {
boolean status = false;

try {
FileReader fis = new FileReader(new File("loanterms.txt"));
BufferedReader br = new BufferedReader(fis);
String[] line = br.readLine( ).split(" ");

for ( int i = 0; i < line.length; i++ ) {

rates[i] = Double.parseDouble(line[i].trim());
i++;
}
fis.close();
status = true;
} catch (Exception e) { //start
JOptionPane.showMessageDialog(this, "File Read Error!!!");
status = false;
} //end

return status;
} //end



Now no file errors when on 1 line. But having issues now with the option box, matching up the .txt too the right numbers.

[Javanooby]

Editing this message, I got it simply forgot to remove a I++ as I was recoding. Thanks for the guidance :) I was working on this a long time.