swing - Implementing JOptionPane in Java -

i created popup window show in response button being clicked in gui. have 2 questions regarding this.

1. how rid of text field below radio buttons?
2. i need check radio button selected once ok button clicked didn't create button. how implement actionperformed function that?

my code:

private void jbutton2actionperformed(java.awt.event.actionevent evt) {                                              if(evt.getsource() == jbutton2)          optionpopup(); }   private void optionpopup(){     jpanel panel = new jpanel();     jradiobutton undergraduatebutton = new jradiobutton();     jradiobutton graduatebutton = new jradiobutton();     buttongroup group = new buttongroup();      undergraduatebutton.settext("option a");     graduatebutton.settext("option b");     group.add(undergraduatebutton);     group.add(graduatebutton);     panel.add(undergraduatebutton);     panel.add(graduatebutton);      joptionpane.showinputdialog(panel); 

1. use joptionpane.showmessagedialog instead of joptionpane.showinputdialog

   if still want have ? icon instead of ! one, use

   joptionpane.showmessagedialog(null, panel, "title", joptionpane.question_message); 

   you can remove icon using joptionpane.plain_message

   if want make sure client pressed ok button use

   int response = joptionpane.showconfirmdialog(null, panel, "title", joptionpane.plain_message);   

   if response -1 means window closed x button, if 0 user pressed ok.

   more info at: https://docs.oracle.com/javase/tutorial/uiswing/components/dialog.html

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2. use undergraduatebutton.isselected() , graduatebutton.isselected() see if 1 of them selected.