java - ListSelectionListener wrong index -

i wanted see element getting selected, , change other labels , texfields on frame per index. code follows:

    list = new jlist(listmodel);     list.setselectionmode(listselectionmodel.single_selection);     list.setlayoutorientation(jlist.vertical);      list.addlistselectionlistener(new listselectionlistener() {         public void valuechanged(listselectionevent e) {             system.out.println(e.getlastindex());         }     }); 

when clicked first element output: 0 0 after clicking second element: 1 1 after tried click first element again, time output 1 1 again. when tried 25 elements, selecting last element , after click first element , output 23 23. event's problem or it's code?

the behaviour standard one, if want have different one, create own selectionlistener considers getvalueisadjusting().

class sharedlistselectionhandler implements listselectionlistener {     public void valuechanged(listselectionevent e) {         listselectionmodel lsm = (listselectionmodel)e.getsource();          int firstindex = e.getfirstindex();         int lastindex = e.getlastindex();         boolean isadjusting = e.getvalueisadjusting();         output.append("event indexes "                       + firstindex + " - " + lastindex                       + "; isadjusting " + isadjusting                       + "; selected indexes:");          if (lsm.isselectionempty()) {             output.append(" <none>");         } else {             // find out indexes selected.             int minindex = lsm.getminselectionindex();             int maxindex = lsm.getmaxselectionindex();             (int = minindex; <= maxindex; i++) {                 if (lsm.isselectedindex(i)) {                     output.append(" " + i);                 }             }         }         output.append(newline);     } } 

find here explanation of example.