How can we read a column from text file

Question

hai,
the Text file contains :
m1 m2 m4 89
m1 m2 m4 89
m0 m4 m2 90
I need one array for each column
m[0]= m1,m1,m0 (first column from text file)
m[1]= m2,m2,m2 (second column from text file)
m[2]= 89,89,90 (third column from text file)
andvance thanks

Answer 1

If a 2D array is OK (instead of 4 separate arrays), try something like this
import java.io.*;
import java.util.ArrayList;
class FileReadColumns
  public static void main(String args[]) throws IOException, FileNotFoundException
    String line;
    ArrayList lines = new ArrayList();
    BufferedReader in = new BufferedReader(new FileReader("data.txt"));
    while ((line = in.readLine()) != null) lines.add(line);
    String bits[];
    bits = lines.get(0).toString().split(" ");
    String grid[][] = new String[bits.length][];
    for(int i=0;i<grid.length;i++)grid[i] = new String[lines.size()];
    for(int i = 0; i < lines.size(); i++)
      bits = lines.get(i).toString().split(" ");
      for(int ii = 0; ii < bits.length; ii++) grid[ii] = bits[ii];
for(int i = 0; i < grid.length; i++)
for(int ii=0;ii<grid[i].length;ii++)System.out.print(grid[i][ii]+" ");
System.out.println();
System.exit(0);