[填空题]阅读下面程序段,SelectItem应用程序显示从文本域的组合框中进行选择,请在程序中的画线处添上正确的语句使得程序能够正确运行。...JTextFieldresult=newJTextField();JComboBoxpick=newJComboBox();publicSelectItem(){super("SelectItem");pick.addItemListener(this);pick.addItem("Navigtor");pick.addItem("InternetExplorer");pick.addItem("Opera");pick.setEditable(false);result.setHorizontalAlignment(SwingConstants.CENTER);result,setEditable(false);pane.setLayout(newBorderLayout());【12】pane.add(pick,"Center");pane.add(result,"South");setContentPane(pane);}publicvoiditemStateChanged(ItemEventevt){Objectsource=evt.getSource();if(source==pick){ObjectnewPick=evt.getItem();result.setText(newPick.toString()+"istheselection.");}repaint();}