Need a solution to read and store data from a file

[sheetalnri]

Hii everyone...I want to know how to store the input values which are read from a file. The input values are all double values in a line separated by spaces. I want to read these values one after the other and store in a double typed variable.

I actually wrote,
FileReader fr=new FileReader(filename);
BufferedReader in=new BufferedReader(fr);
while(true)
{
String line=in.readLine();//here i cud read the line

Please help me.
Thanks...

[tim]

Hello

Your code is correct, but it will result in an infinite loop. To stop this, use a condition to break out of the loop. The following code will create a vector of String objects of each line in the file.

Code:

public static Vector<String> loadFile(String filename){
    Vector<String> strings = new Vector<String>();
    try{
        FileReader file = new FileReader(filename);
        BufferedReader buffer = new BufferedReader(file);
        while (true)
        {
            String line = buffer.readLine();
            if (line == null)
                break;
            else {
                strings.add(line); 
            }
        }
        buffer.close();
    } catch (Exception e) {
        System.out.println("Error: " + e.getMessage());
    }
    return strings;
}

Note that you must always close a file after using it and that the readLine() method will return null if there is no more to read. It is also important to handle any exceptions that by be thrown by the IO classes.


I do not have a IDE on this PC, so my code has been checked by hand.

[sheetalnri]

thanks for ur post...
but my question is how to store double values of a line of a text file one by one to variables...
if the first line of input is: 1.0,1.0,90.0
and second line: 1.0,1.0,0.0
and third line: ........... and so on

First I want to read the first line and then I want to store them like
double a=1.0;
double b=1.0;
double c=90.0;
and then go for the second line and read the data and store them
and so on....

thanks again...

[tim]

Hello

I have attached a zip file for you. It contains an executable jar file, a "numbers.txt" file and the source code "Main.java". You can use a text editor to view the source code, like "Notepad" if you are using Windows. It can do everything that you asked and more. I like to use Vector data structures and iterators for fast coding. Just ask if you need more help. The program will increment all the numbers in the data file "numbers.txt". To see this:

1. Open "numbers.txt"
2. Close "numbers.txt"
3. Run the jar executable
4. Reopen "numbers.txt"

Just ask if you cannot access the code then I will post it.

Hope this helps.