public static void main (String args[]) {
    String user = "user";
    String password = "password";
    String host = "hostName";
    int port=22;

    //String remoteFile="/home/john/test.txt";
    //String yes="yes";

    try {
        JSch jsch = new JSch();
        Session session = jsch.getSession(user, host, port);
        session.setPassword(password);
        session.setConfig("StrictHostKeyChecking", "no");
        System.out.println("Establishing Connection...");
        session.connect();
        Channel channel = session.openChannel("exec");

        // After this it'll ask for confirmation and password
        ((ChannelExec)channel).setCommand("ssh myServerName");
        channel.connect();

        InputStream output = channel.getInputStream();

        System.out.println("aafter stream");
        int readByte = output.read();
        StringBuilder outputBuffer = new StringBuilder();
        while (readByte != 0xffffffff) {
            //System.out.println("read byte" + readByte);
            outputBuffer.append((char)readByte);
            readByte = output.read();
        }
        System.out.println(outputBuffer.toString());
        channel.disconnect();
    } catch (Exception e){
        System.err.print("error message" + e);
    }
}

try {
    session = jsch.getSession(user, host, port);
}
catch (JSchException e) {
    throw new TransferException("Failed to open session - " + params, e);
}

session.setPassword(password);

//  Create UserInfo instance in order to support SFTP connection to any machine
//  without a key username and password will be given via UserInfo interface.
UserInfo userInfo = new SftpUserInfo();
session.setUserInfo(userInfo);

try {
    session.connect(connectTimeout);
}
catch (JSchException e) {
    throw new TransferException("Failed to connect to session - " + params, e);
}

boolean isSessionConnected = session.isConnected();

Channel channel = session.openChannel("exec");
        ((ChannelExec) channel).setCommand("sudo -S -p '' " + command);
        channel.setInputStream(null);
        OutputStream out = channel.getOutputStream();
        ((ChannelExec) channel).setErrStream(System.err);
        InputStream in = channel.getInputStream();
        ((ChannelExec) channel).setPty(true);
        channel.connect();
        out.write((password + "n").getBytes());
        out.flush();