Choice displays only the first option.

Question

hi,
I am having problem with the "Choice" menu i created. It is displaying only the first choice option, though i select other choices...Meaning, it's displaying only "23.0" whatever other values i select...any suggetions?
Thanks in advance.
public class equalneutron extends Applet implements MouseListener{
//        ... (variable declaration)
         Choice distance = new Choice();   
         public void init() {       
           addMouseListener(this);       
           distance.addItem("23Mpc");       
           distance.addItem("60Mpc");       
           distance.addItem("100Mpc");       
           distance.addItem("200Mpc");       
           distance.addItem("500Mpc");       
           distance.addItem("1000Mpc");       
           r_Mpc=distance.getSelectedItem();       
           add(distance, BorderLayout.NORTH);       
           ItemListener il = new ItemListener() {       
               public void itemStateChanged(ItemEvent ee){                         
                   if(r_Mpc.equals("23Mpc")){               
                       r = 23.0F;           
                  }else if(r_Mpc.equals("60Mpc")){               
                       r = 60.0F;                           
                  }else if(r_Mpc.equals("100Mpc")){               
                       r = 100.0F;           
                  }else if(r_Mpc.equals("200Mpc")){               
                       r = 200.0F;           
                  }else if(r_Mpc.equals("500Mpc")){               
                       r = 500.0F;
                  }else if(r_Mpc.equals("1000Mpc")){
                       r = 1000.0F;
distance.addItemListener(il);   
// ...... rest of the code

Answer 1

it is allways returning 23.0 because tou've initialized r_MPC to the selected value which is 23.0 at the beginning.
You must reask the selected value in the listener :
ItemListener il = new ItemListener() {                      
public void itemStateChanged(ItemEvent ee){
String selected = distance.getSelectedValue().toString();
// the rest of your code
hope it'll help