如何将.txt文件中的2D浮点矩阵导入Java中的2D浮点数组？

Question

My data.txt file takes the following format:

14 -0.0 0.29964766 10.7192135 0.0 0.0 0.0 0.0 0.0 0.0
15 -0.0 0.29964766 10.7192135 0.0 0.0 0.0 -8.4375 -36.6875 2.25
15 -0.0 0.29964766 10.7192135 0.20300001 -0.083000004 -0.019000001 -8.4375 -36.6875 2.25
16 -0.0 0.29964766 10.7192135 0.20300001 -0.083000004 -0.019000001 -8.4375 -36.6875 2.25
16 -0.0 0.29964766 10.7192135 0.136 -0.072000004 -0.020000001 -8.4375 -36.6875 2.25
16 -0.0 0.29964766 10.7192135 0.136 -0.072000004 -0.020000001 -8.4375 -36.6875 2.25
17 -0.0 0.29964766 10.7192135 0.136 -0.072000004 -0.020000001 -8.4375 -36.6875 2.25
20 0.21792556 0.40861043 9.956474 0.136 -0.072000004 -0.020000001 -8.4375 -36.6875 2.25
21 0.21792556 0.40861043 9.956474 0.136 -0.072000004 -0.020000001 -8.4375 -36.375 1.375
...

It always has 16 columns. But the row number is unknown because it is actually the number of data set collected, and thus depend on how long are the data being collected.

I wish to import these data into a 2D float array in Java so that I can easily take out one column for analysis purpose.

Can someone kindly help?

---

The unknown row number is not an issue. I can easily write out a getRowNumber() function.

What really bothers me is how to really import all the numbers in.

Answer 1

If you want to know the number of the line in a file you can read it and put a counter in the while loop

    public int lineCounter(){
     BufferedReader br = new BufferedReader(new FileReader("file.txt"));
     int i =0;   
     try {
            String line = br.readLine();

            while (line != null) {
                i++;
            }
            String everything = sb.toString();
        } finally {
            br.close();
        }
        return i;
    }

Then you can set up your 2d matrix and work it as you want

Hope this help