java - Using a value to fire Jcombobox actionlistener instead of getselectedindex? -

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here jcombobox has 2 items name , id 

   public void comboitem() {  chooser.removeallitems(); chooser.additem("please select..."); try {              string sql="select * patients_details";          pst = conn.preparestatement(sql);          rs=pst.executequery();          while (rs.next()) {             string id = rs.getstring("patient_id"); // id             string name = rs.getstring("name"); // name               comboitem comboitem = new comboitem(id, name); // create new comboitem             chooser.additem(comboitem); // put combobox             string tmp=comboitem.getid();         }       } catch (sqlexception sqle) {         system.out.println(sqle);     }

jcombobox actionlistener code

private void chooserpopupmenuwillbecomeinvisible(javax.swing.event.popupmenuevent evt) {                                                          object selectedvalue = chooser.getselectedindex();      try{         string sql="select * patients_details patient_id=? ";       pst=conn.preparestatement(sql);       pst.setobject(1, selectedvalue);       rs=pst.executequery();       if(rs.next()){        string add1=rs.getstring("patient_id");       txtpatientid.settext(add1);       string add2=rs.getstring("name");       txtname.settext(add2);       string add3=rs.getstring("age");       txtage.settext(add3);       string add4=rs.getstring("gender");       txtgender.settext(add4);       string add7=rs.getstring("date");       txtdate.settext(add7);         }    }    catch(exception e) {     joptionpane.showmessagedialog(null,e );    } }

my question is: how can use id value fire jcombobox listener instead of getselectedindex appreciated.

use getselecteditem() obtain reference selected comboitem, , it's id; use getselectedindex() obtain it's index.

because setselectedindex() fires combo's actionlistener, navigational controls such ⊲prev , next⊳ buttons can delegate combo, shown here:

  • obtain index getselectedindex().

  • increment or decrement index.

  • perform range check on index.

  • delegate selection combo via setselectedindex(index).

a particular implementation of comboboxmodel, such defaultcomboboxmodel, can searched using iteration:

for (int = 0; < dcbm.getsize(); i++) {     comboitem item = (comboitem) dcbm.getelementat(i);     // check item }

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