Java - Como llamar a una metodo desde otra clase

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/*

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 * and open the template in the editor.

 */

package windows;

import dao.PublicoSingleton;

import dao.personasDAO;

import java.text.DecimalFormat;

import java.util.Iterator;

import java.util.List;

import org.zkoss.zul.Listbox;

import org.zkoss.zul.Listcell;

import org.zkoss.zul.Listitem;

import org.zkoss.zul.Window;

import dao.genericoDAO;

import org.springframework.jdbc.core.JdbcTemplate;

/**

 *

 * @author A101

 */

public class CtrlReportesWnd extends Window{

    Listbox lista;

    protected personasDAO currentPersonas;

    genericoDAO g = new genericoDAO();

    PublicoSingleton s = g.getPublicoSingleton();

    public void onCreate(){

        lista=(Listbox)this.getFellow("lista");

        currentPersonas = new personasDAO();

        currentPersonas.setJdbcTemplate(s.getJdbcTemplate());

        MostrarSeleccionado();

    }

    public void MostrarSeleccionado(){

    java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("dd-MM-yyyy");

    DecimalFormat df = new DecimalFormat("##0.000");

        currentPersonas.setCip(s.getCUSUARIO_CODIGO());

        List lt = currentPersonas.Ctrl_Reporte(s.getCUSUARIO_CODIGO());

        lista.getItems().clear();

        for(Iterator it = lt.iterator();it.hasNext();){

            personasDAO i = (personasDAO) it.next();

            Listitem item = new Listitem();

            String j = (String)i.getCip();

            item.setValue(j);

            item.appendChild(new Listcell((i.getGrado())));

             item.appendChild(new Listcell((i.getNombres())));

            item.appendChild(new Listcell((i.getMenu())));

            item.appendChild(new Listcell((i.getIdentifica())));

            item.appendChild(new Listcell(sdf.format(i.getInicio())));

            lista.appendChild(item);

        }

}

}

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/*

 * To change this template, choose Tools | Templates

 * and open the template in the editor.

 */

package windows;

import dao.PublicoSingleton;

import dao.cambiosDAO;

import dao.genericoDAO;

import dao.personasDAO;

import java.text.DecimalFormat;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import org.zkoss.zk.ui.Executions;

import org.zkoss.zkex.zul.Jasperreport;

import org.zkoss.zul.*;

/**

 *

 * @author eduard

 */

public class ImprimirFojaServicios extends Window{

public void imprimir() throws Exception{

try {

    String DATE_FORMAT = "dd/MM/yyyy";

    String  strFecha = "";

    java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(DATE_FORMAT);

    ireport.setWidth("100%");

    ireport.setHeight("100%");

      //Window win = new Window(getReportTitle(), "normal", true);

    Window win = new Window(this.getTitle(), "normal", true);

            win.setPosition("center");

            win.setWidth("50%");

            win.setHeight("50%");

            win.setClosable(true);

            win.setMinimizable(true);

            win.setMaximizable(true);

            String resultado = currentPersonas.GRABA_USUARIO_IMPRESION(s.getCUSUARIO_CODIGO(), s.getMenu(), currentPersonas.getDni());

                ireport.setSrc("/rpt/FOJA/FS_CABECERA.jasper");

    ireport.setDataConnection(s.getJdbcTemplate().getDataSource().getConnection());

    ireport.setParent(win);

    Map parameters = new HashMap();

    parameters.put("P_DNI",currentPersonas.getDni());

     parameters.put("P_RUTA","E:\\Program Files\\Apache Software Foundation\\Tomcat 7.0\\webapps\\Pentagonito\\img\\" +P_RUTA);

     parameters.put("P_RUTA_1","E:\\Program Files\\Apache Software Foundation\\Tomcat 7.0\\webapps\\Pentagonito\\img\\reportes\\001.jpg");

     parameters.put("P_RUTA_2","E:\\Program Files\\Apache Software Foundation\\Tomcat 7.0\\webapps\\Pentagonito\\img\\reportes\\002.jpg");

    ireport.setParameters(parameters);

    //ireport.setDatasource(dataSource);

    //ireport.setType("csv");

    ireport.setVisible(true);

    win.setParent(this);

    win.doOverlapped();

}catch(Exception e){

    Messagebox.show(e.toString(),this.getTitle(),Messagebox.OK,Messagebox.EXCLAMATION);

}

}

}

public class ImprimirFojaServicios{

.......

CtrlReportesWnd  objetoCtrlReportesWnd = new CtrlReportesWnd()

objetoCtrlReportesWnd.MostrarSeleccionado();

......

}