Java Programming

i want to ssh a server and run some commands ...

i tried that code but i prompt for password is there any api for ssh how can i do that

import java.util.*;
import java.io.*;
import java.sql.*;
import java.text.*;
import java.lang.*;
import java.io.IOException;
import java.net.SocketException;








public class MyClass
{

public static void main( String[] args )
        {

File wd = new File("/bin");
System.out.println(wd);
Process proc = null;
Process proc2 = null;
try {
   proc = Runtime.getRuntime().exec("/bin/bash", null, wd);
}
catch (IOException e) {
   e.printStackTrace();
}
if (proc != null) {
   BufferedReader in = new BufferedReader(new InputStreamReader(proc.getInputStream()));
   PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(proc.getOutputStream())), true);
   out.println("cd /");
   out.println("ssh root@122.20.19.10");
  out.println("cd /");
 out.println("ls");

  out.println("pwd");




   out.println("exit");

try {
      String line;
      while ((line = in.readLine()) != null) {
         System.out.println(line);
      }
      proc.waitFor();
      in.close();
      out.close();
      proc.destroy();
   }
   catch (Exception e) {
      e.printStackTrace();
   }
}


    }//end of main mehtod

}//END OF CLASS

thanks