how to excute a linux shell command in java

quoted from: http://bbs.chinaunix.net/viewthread.php?tid=841011&extra=page%3D4

/* test.java */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class test
{
    public static void main(String[] args)
    {
        String lsString = null;
        Process process = null;
        try
        {
            process = Runtime.getRuntime().exec(“ls”);
            BufferedReader bufferedReader = new
                BufferedReader(new InputStreamReader(process.getInputStream()));
            while ((lsString = bufferedReader.readLine()) != null)
            {
                System.out.println(lsString);
            }
            try
            {
                process.waitFor();
            }
            catch (InterruptedException e)
            {
                e.printStackTrace();
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
} // end test.java

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