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how can i create different codes for server and client using following code
BluetoothSerialPortInfo[] info = BluetoothSerialPort.getSerialPortInfo();

    try {
        Dialog.alert(info[0].toString());

        StreamConnection _bluetoothConnection = (StreamConnection)Connector.open( info[0].toString(), Connector.READ_WRITE );
        DataOutputStream _dout = _bluetoothConnection.openDataOutputStream();
        final int JUST_OPEN = 4;
        _dout.writeInt(JUST_OPEN);
        DataInputStream _din = _bluetoothConnection.openDataInputStream();
        String contents = _din.readUTF();
    System.out.println(contents);

        _bluetoothConnection.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}