XML : Java GUI Advice

I have a java file which parses an XML file using SAX which seems to work fine.

The following is my SAX.java file:

   public class SAX extends DefaultHandler{       private final List<Student> studentList = new ArrayList<Student>();       private String tempVal;       private Student tempStudent;    public void runExample(){      parseDocument();      outputList();  }    private void parseDocument(){      try {          // get a factory object          SAXParserFactory spf = SAXParserFactory.newInstance();            // get an instance of the parser          SAXParser sp = spf.newSAXParser();            // parse the XML file and register this          // class for callbacks          sp.parse("Students.xml", this);      } catch (Exception ex) {          ex.printStackTrace();      }  }  private void outputList(){      for(Student student : studentList){          System.out.println(student);      }  }    // the event handlers....  @Override  public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {      // reset      tempVal = "";      if(qName.equalsIgnoreCase("Student")){          // create a new Employee object          tempStudent = new Student();          tempStudent.setTitle(attributes.getValue("Title"));      }   //        System.out.println(   //                "startElement::qName is "+qName);  }    @Override  public void characters(char []ch, int start, int length) throws SAXException{             tempVal = new String(ch, start, length);   //        System.out.println("tempVal is "+tempVal);  }    @Override  public void endElement(String uri, String localname, String qName) throws SAXException {      if(qName.equalsIgnoreCase("Student")){          studentList.add(tempStudent);      } else if(qName.equalsIgnoreCase("Name")){          tempStudent.setName(tempVal);      } else if(qName.equalsIgnoreCase("Age")){          tempStudent.setAge(Integer.parseInt(tempVal));      } else if(qName.equalsIgnoreCase("College")){          tempStudent.setCollege(tempVal);      } else if(qName.equalsIgnoreCase("School")) {          tempStudent.setSchool(tempVal);      }  }    public static void main(String []args){      SAX spe = new SAX();      spe.runExample();  }  }    

However, I have been asked to present this in a GUI. When a particular radio button is clicked and user clicks parse the XML file will be parsed using SAX and the results will be shown in a text box. I have been given the GUI, it is already coded, my issue is I have limited knowledge of GUI's and I do not have a clue how to integrate the two of them.

  public void actionPerformed(ActionEvent e) {  else if (e.getSource() == parseButton){          if(saxRadioButton.isSelected()){              // do SAX stuff          }    

I'm just looking for someone to point me in the right direction here. Should I be making the SAX file separately or should I be putting straight into the If statement. I'm completely lost.