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.

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 may 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.

[Anushaanni]

Hello....
Can any one please help me with this problem
how to store double values of a line of a text file one by one to variables...
if the first line of input is: 1.0,2.0
1.90,2.45....
and second line: 1.0,1.0
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=2.0;
double c=1.90;
and then go for the second line and read the data and store them
and so on....

[CJSLMAN]

There seems to be an echo in this posted thread ...

Anushaanni... look in the above posts...

CJSL

[peotoy]

can some pls re-upload the example.zip as the winzip is not opening it .

thanks

[masijade]

Well, seeing as how it's all null bytes, no wonder. Hopefully it was meant to be a joke on you, if not, then "shame on you, tim". (For attempting to post it at all, that does not help.)

See the API docs for Double (the parse/valueOf methods) and String (the split method), and Character Streams (The Java™ Tutorials > Essential Classes > Basic I/O)

[tim]

Hi masijade

Hopefully it was meant to be a joke on you, if not, then "shame on you, tim". (For attempting to post it at all, that does not help.)

It seems that the file was corrupted while I uploaded it. And no, I don't make fun of others. I deleted the corrupted zip file. :(

I'm sorry about that sheetalnri. :o

[yemyem]

Hi, I have the exact same problem but i cant see see how to get hold of your zip file tim.

thanks

[masijade]

Hi, I have the exact same problem but i cant see see how to get hold of your zip file tim.

thanks

Well good for you. Another cheating attempt thwarted.

Exactly what are you having a problem with? Post your code, any and all compiler/exception messages, and a complete (but brief) description of expected results vs. actual results. Then we will help you correct your code.

If you don't figure out how to do this assignment (and copying someone else's code is not solving it yourself) then you'll have an even harder time with your next assignment which will probably build of the principles learned in this assignment. Which, of course, you won't have learned if you simply copy someone else's code.