Selective retrieval of numbers in a text file

I have a text file as follows

Code:

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            total      used      free    shared    buffers    cached
Mem:          7923      7875        47          0        564      3237
-/+ buffers/cache:      4074      3848
Swap:        12287      1067      11220
Total:      20211      8943      11267

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I have to retrieve only those values which fall in the mem, swap and total under total, used and free i.e. I have to ignore 0, 564, 3237, 4074, 3848. How do I do it?

I have written the following code to display the all the numbers.

Code:

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package my.scan; 
import java.util.*; //importing some java classes 
import java.lang.*; 
import java.io.*; 
 
class ReadFile {
        void getFile () {
                int i = 0;
               
              try { 
                      Scanner myFile = new Scanner(new FileReader("C:/Documents and Settings/shikhau/workspace/SanNumber/freelast.txt")); 
                      while (myFile.hasNext()) { 
                          if (myFile.hasNextInt()) {
                                  i = myFile.nextInt();
                                  System.out.println(i);
                          }
                          else {
                                          myFile.next();
                          }             
                      } 
              } 
              catch (FileNotFoundException e){ 
                  System.out.println("Sorry! This file is not found"); 
              }
        }
}

public class ScanNum { 
    public static void main(String[] args) { 
        ReadFile rf = new ReadFile();
            rf.getFile();
         
    } 
 
}

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Check if the line begins with mem, swap or total and ignore any line that doesn't.
Use split(" +") to break each line into columns.
Extract the data from the relevant columns.