how to redirect output of "tasklist" command in file using java.

Question

i am trying to get output of "tasklist" command which is run on cmd and trying to save output in some file.but, i am getting output in another cmd prompt and file is also creating but file is empty.plzz tell me how to save output to file.
import java.awt.*;
import java.io.*;
public class TaskManager1
{
static void run(String cmd)
{
System.out.print("\nbefore try");
try
{
Process child = Runtime.getRuntime().exec(cmd);
}
catch (Exception e)
{
System.out.println("HEY Buddy ! U r Doing Something Wrong ");
e.printStackTrace();
}
System.out.print("\noutside catch");
}

public static void main(String[] args)
{
run("cmd /c start cmd.exe /K tasklist > D:\\tasklist.txt");
}
}

Answer 1

// I wrote this an year ago and this is one of those reusable functions that i still use when needed. This may help you.
// Note: This is how you need to initialize the file object that you are to send to this method:
// File f = new File("filepathhere");
// Goodluck

//This method is used to add/save the record to the file
public static boolean addRecord(File f, String stringtoSave) throws IOException {

if (!f.exists()) {
f.createNewFile();
}

FileWriter fw = new FileWriter(f.getAbsoluteFile(), true);
BufferedWriter bw = new BufferedWriter(fw);

bw.write(stringtoSave);
if (bw != null) {
bw.close();
}
if (fw != null) {
fw.close();
}
return true;
}