String to Hex Conversion

[mocha]

Hi,

I have here the code and i want to convert the inputted list version by the user. The inputted list version , once the URL was generated. The List Version must generate, for 11 as inputted list version in textListVersion it must generate %00%00%0B. PLease help me to fix this problem. thanks i advance. :D

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private void sendRefresh(int index){

textAreaOutput.setText("");



StringBuffer sb = new StringBuffer();

sb.append("%");

sb.append(AppletSimulatorConstants.CMD_ID_REFRESH_ LIST);

sb.append("%");

sb.append("00");

sb.append("%");

sb.append("00");

sb.append("%");

sb.append(textListVersion.getText());





String url = "http://" + serverAddress + "/" + gatewayName + "/sendMessage.psc?msisdn=" + MSISDN[index] + "&sendMessage=" + sb ;



System.out.println(url);

//

String result = sendGetRequest(url);

textAreaOutput.setText(result);



}