JAVA调用外部EXE实现PING功能

import java.io.*;
import java.lang.*;

public class Ping {
    
    public Ping() {
    }
    public static void main(String args[])
    {
        if (args.length < 1)
        {
            System.out.println("syntax Error!");
        }
        else
        {
            String line = null;
            try
            {
                Process pro = Runtime.getRuntime().exec("ping " + args[0]);
                BufferedReader buf = new BufferedReader(new InputStreamReader(pro.getInputStream()));
                while((line = buf.readLine()) != null)
                    System.out.println(line);
            }
            catch(Exception ex)
            {
                System.out.println(ex.getMessage());
            }
        }
        
    }
}