java - JList item deselected after clicking a JButton -

java - JList item deselected after clicking a JButton -

what tried select item jlist, click jbutton (optionally click jradiobutton), , value of selected item added jlist.

the problem after clicked jbutton or jradiobutton, item in original jlist deselected, , added destination jlist "null".

first jlists. items specified selection jcombobox, , generate values arraylist in class.

@override public void actionperformed(actionevent e) { // todo auto-generated method stub channellist cl = new channellist(); cl.createlist(); //determine jlist jcombobox selecton string genre = (string)c.getselecteditem(); switch(genre){ case "please select genre of channel": vt1.clear(); lchannels.setlistdata(vt1); break; case "all genres": vt1.clear(); for(int =0; < cl.chlist.length; i++){ char chgenre = cl.chlist[i].getchgenre(); vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } break; case "entertainment": vt1.clear(); for(int =0; < cl.chlist.length; i++){ char chgenre = cl.chlist[i].getchgenre(); if(chgenre == 'e'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } } break; case "movie": vt1.clear(); for(int =0; < cl.chlist.length; i++){ char chgenre = cl.chlist[i].getchgenre(); if(chgenre == 'm'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } } break; case "news/business": vt1.clear(); for(int =0; < cl.chlist.length; i++){ char chgenre = cl.chlist[i].getchgenre(); if(chgenre == 'n'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } } break; case "sci-fi": vt1.clear(); for(int =0; < cl.chlist.length; i++){ char chgenre = cl.chlist[i].getchgenre(); if(chgenre == 's'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } } break; case "sports": vt1.clear(); for(int =0; < cl.chlist.length; i++){ char chgenre = cl.chlist[i].getchgenre(); if(chgenre == 't'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } } break; } }

the problem solved, changed logic of retrieving values.

@override public void actionperformed(actionevent e) { // todo auto-generated method stub channellist cl = new channellist(); cl.createlist(); //determine jlist jcombobox selecton genre = c.getselecteditem().tostring(); if(e.getsource() == c){ vt1.clear(); for(int =0; < cl.chlist.length; i++){ char chgenre = cl.chlist[i].getchgenre(); switch(genre){ case "please select genre of channel": lchannels.setlistdata(vt1); break; case "all genres": vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); break; case "entertainment": if(chgenre == 'e'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } break; case "movie": if(chgenre == 'm'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } break; case "news/business": if(chgenre == 'n'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } break; case "sci-fi": if(chgenre == 's'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } break; case "sports": if(chgenre == 't'){ vt1.add(cl.chlist[i].getchtitle()); lchannels.setlistdata(vt1); } break; } } } }

java swing jbutton jlist japplet