How to read data from finger print reader and convert into image file in java

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Java

i have to read data from finger print reader and convert into image file. I am using Digital Persona 's device U and U 4500 with Platinum SDK . I am new biometric field. Till now I am only able to detect the device means whether it is connected to system or not.Please guide me what should i do to accomplish this task

i have used this Code(only to check whether device is working )

import com.digitalpersona.onetouch.DPFPGlobal;
import com.digitalpersona.onetouch.DPFPSample;
import com.digitalpersona.onetouch.capture.DPFPCapture; 
import com.digitalpersona.onetouch.capture.event.DPFPDataEvent;
import com.digitalpersona.onetouch.capture.event.DPFPDataListener;
import com.digitalpersona.onetouch.capture.event.DPFPErrorEvent;
import com.digitalpersona.onetouch.capture.event.DPFPErrorListener;
import com.digitalpersona.onetouch.capture.event.DPFPReaderStatusAdapter; 
import com.digitalpersona.onetouch.capture.event.DPFPReaderStatusEvent;
import com.digitalpersona.onetouch.capture.event.DPFPReaderStatusListener;
import com.digitalpersona.onetouch.capture.event.DPFPSensorEvent;
import com.digitalpersona.onetouch.capture.event.DPFPSensorListener;


public class Demo {
public static void main(String args[]){
//byte[] a=null;
DPFPCapture capture=DPFPGlobal.getCaptureFactory().createCapture();
capture.addReaderStatusListener(new DPFPReaderStatusListener() {

    @Override
    public void readerDisconnected(DPFPReaderStatusEvent arg0) {
         //TODO Auto-generated method stub
        System.out.println("I m Dis-connected");

    }

    @Override
    public void readerConnected(DPFPReaderStatusEvent arg0) {
        // TODO Auto-generated method stub
        System.out.println("I m connected");
    }
});
capture.addSensorListener(new DPFPSensorListener() {

    @Override
    public void imageAcquired(DPFPSensorEvent arg0) {
        // TODO Auto-generated method stub
        System.out.print("acquired");
    }

    @Override
    public void fingerTouched(DPFPSensorEvent arg0) {
        // TODO Auto-generated method stub
        System.out.print("s");
    }

    @Override
    public void fingerGone(DPFPSensorEvent arg0) {
        // TODO Auto-generated method stub
        System.out.print("gone");
    }
});
capture.startCapture();
capture.addDataListener(new DPFPDataListener() {

    @Override
    public void dataAcquired(DPFPDataEvent arg0) {
        // TODO Auto-generated method stub
        DPFPSample sample=DPFPGlobal.getSampleFactory().createSample();
        sample=arg0.getSample();    
        byte a[]=sample.serialize();
        for(byte i:a){
            System.out.print(i);
        }
    }
});
capture.addErrorListener(new DPFPErrorListener() {

    @Override
    public void exceptionCaught(DPFPErrorEvent arg0) {
        // TODO Auto-generated method stub
        System.out.println("error");
    }

    @Override
    public void errorOccured(DPFPErrorEvent arg0) {
        // TODO Auto-generated method stub
        System.out.println("error");

    }
});

}