Reading file .txt

[will_java]

Good morning everyone, I'm having the following problem:
I'm trying to read data from a file qeu are organized as follows:

2 0 0 0
2 0 1 0
2 0 2 0
2 0 3 0
2 0 4 0
2 0 5 0
2 0 6 0
2 0 7 0
2 0 8 0
2 0 9 0
time

I just need to put each column into a vector, where only the first three columns, so I will have three vectors X, Y and Z. and stop to read when you see the word "time"

I will then result in the vectors:

X: 2 2 2 2 2 2 2 2 2 2
Y: 0 0 0 0 0 0 0 0 0 0
Z: 0 1 2 3 4 5 6 7 8 9

Could someone send me a solution?

Thank you.

[KevinWorkman]

How To Ask Questions The Smart Way

[eRaaaa]

i would use only one vector/list. write a class which stores the three ints (x,y,z). use the scanner class to read the file, instantiate objects of that class, and store it in your vector/list.
the scanner class has methods like hasNextInt and nextInt, next or nextLIne -->

while(sc.hasNextInt()){ read the next three integer --> create an object --> save the object in your list}

whats about the fourth integer/column? skip it ?

[lovelesh]

Try this:

File fileName = new File("C:\\Lovelesh\\Temp.txt");
if(fileName.exists())
{
try {
BufferedReader bufferedReader = new BufferedReader(new FileReader(fileName));

String line = bufferedReader.readLine();
Vector<String> a = new Vector<String>();
Vector<String> b = new Vector<String>();
Vector<String> c = new Vector<String>();

while(null != line && (!line.equalsIgnoreCase("time") || line != null)){
String[] temp = line.split(" ");
if(temp.length > 1){
a.add(temp[0]);
b.add(temp[1]);
c.add(temp[2]);
}
line = bufferedReader.readLine();
}

System.out.println(a);
System.out.println(b);
System.out.println(c);
} catch (FileNotFoundException e) {

e.printStackTrace();
} catch (IOException e) {

e.printStackTrace();
}

}

[pbrockway2]

@lovelesh: I wonder if your post isn't taking away the fun the OP might obtain from figuring out how to write the code. "Read the file line by line, split each line into its components and add each of the first three to three Vectors" would be a nudge that's gentle enough not to push the OP right out of the picture.

But if you do post code, please use the code tags: put [CODE] at the start of the code and [/CODE] so that the resulting post is formatted and readable.

----------------------------------

//Vector<String> a = new Vector<String>();
    // why not
List<String> a = new ArrayList<String>(); 
   // change ArrayList to whatever List implementation makes sense
   // given the specific requirements

Basically there's no magic way to know that the Vector list implementation *is* the most appropriate (and a strong possibility that it isn't). And even it were the most appropriate, declaring the variable as "List<String> a = new Vector<String>()" would be more flexible.

//while(null != line && (!line.equalsIgnoreCase("time") || line != null)){
    // why not
while(line != null && !line.equalsIgnoreCase("time")) {

This latter pair aren't equivalent. As written your condition will fail to recognise the "time" line as a stopping condition.

[lovelesh]

@lovelesh: I wonder if your post isn't taking away the fun the OP might obtain from figuring out how to write the code. "Read the file line by line, split each line into its components and add each of the first three to three Vectors" would be a nudge that's gentle enough not to push the OP right out of the picture.

You are right, but this guy was looking for solution, that's why :-(

But if you do post code, please use the code tags: put [CODE] at the start of the code and [/CODE] so that the resulting post is formatted and readable.

I will keep this in mind, no on :-)
----------------------------------

//while(null != line && (!line.equalsIgnoreCase("time") || line != null)){
    // why not
while(line != null && !line.equalsIgnoreCase("time")) {

This latter pair aren't equivalent. As written your condition will fail to recognise the "time" line as a stopping condition.

Thanks for this, I didn't review it before posting that ....my mistake