How to add an item in the combobox list at runtime

Question

i want to add an item to the list of items in the combobox. How can I do this? I tried to use the methods getselecteditem() and getitem() from the actionlistener but no success.
so after i add an item, the next time when i run that frame, that item should be displayed in the list of items in the combobox. Can anybody help me with this?

Answer 1

Thanks Encephalophathic.
Let me explain you the whole design -
I have a frame having textfields and comboboxes. Now in the combobox, i have added some fields during design time and some i want the user to add at runtime. After the user clicks the Save button, i want the new string if entered in the combobox by the user at runtime to be added in the list of items of the combobox. So the next time when that frame is run, the item added by the user at runtime previously should be there in the list of items displayed in the combobox.
What I am trying to do in this code at the combobox is if the user enters a new string in the combobox, then if he presses enter key, the value entered in the list of the combobox should be entered in the list of items of the combobox. Actually i m just trying to get the item typed in by the user, so just testing with enter key, but really i want it on the button click. I tried to add the code for adding an item to the combobox in the actionperformed, but i m not able to add it so confused what to do. Please help me with this.
Here's the whole code for that -
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JComboBox;
import java.awt.event.ActionListener;
import javax.swing.JOptionPane;
import javax.swing.JDialog.*;
import javax.swing.JComboBox;
public  class EnterFD implements ActionListener{
  private JFrame frame;
   private JPanel mainpanel,menupanel,userinputpanel,buttonpanel;
   private JMenuBar menubar;
   private JMenu menu,submenu;
   private JMenuItem menuitem;
   private JCheckBoxMenuItem cbmenuitem;
   private JLabel fdnumber;
   private JLabel bankname;
   private JLabel beneficiaryname;
   private JLabel entereddate;
   private JLabel maturitydate;
   private JLabel rateofinterest;
   private JLabel amount;
   private JLabel maturityamount;
   private JTextField fdnumbertxtfield;
   private JComboBox banknamecombobox;
   private JTextField beneficiarynametxtfield;
   private JComboBox entereddatecombobox;
   private JComboBox maturitydatecombobox;
   private JTextField rateofinteresttxtfield;
   private JTextField amounttxtfield;
   private JTextField maturityamounttxtfield;
   private JButton savebutton;
   private JButton clearbutton;
public EnterFD() {
        initComponents();}
    private final void initComponents(){
        fdnumber = new JLabel("FD Number:");
        bankname = new JLabel("Bank Name:");
        beneficiaryname = new JLabel("Beneficiary Name:");
        entereddate = new JLabel("Entered Date:");
        maturitydate = new JLabel("Maturity Date:");
        rateofinterest = new JLabel("Rate Of Interest:");
        amount = new JLabel("Amount:");
        maturityamount = new JLabel("Maturity Amount:");
        fdnumbertxtfield = new JTextField();
        banknamecombobox = new JComboBox();
        banknamecombobox.addItem("State Bank Of India");
        banknamecombobox.addItem("Bank Of Baroda");
        banknamecombobox.addItem("IDBI Bank");
        banknamecombobox.addItem("ICICI Bank");
        banknamecombobox.addItem("Punjab National Bank");
        banknamecombobox.setEditable(true);
        banknamecombobox.setSelectedIndex(-1);
        banknamecombobox.addKeyListener(new java.awt.event.KeyAdapter() {
            @Override
            public void keyTyped(java.awt.event.KeyEvent evt) {
                banknamecomboboxKeyTyped(evt);
        banknamecombobox.addKeyListener(new java.awt.event.KeyAdapter() {
            @Override
            public void keyReleased(java.awt.event.KeyEvent evt) {
                banknamecomboboxKeyReleased(evt);
        beneficiarynametxtfield = new JTextField();
        entereddatecombobox = new JComboBox();
        maturitydatecombobox = new JComboBox();
        rateofinteresttxtfield = new JTextField();
        amounttxtfield = new JTextField();
        maturityamounttxtfield = new JTextField();
        menubar = new JMenuBar();
         menu = new JMenu("File");
         menubar.add(menu);
         menuitem = new JMenuItem("New");
         menu.add(menuitem);
         menuitem.addActionListener(this);
         menuitem = new JMenuItem("Save");
         menu.add(menuitem);
         menuitem.addActionListener(this);
         menuitem = new JMenuItem("Close");
         menu.add(menuitem);
         menuitem.addActionListener(this);
         menuitem = new JMenuItem("Exit");
         menu.add(menuitem);
         menuitem.addActionListener(this);
         menu = new JMenu("Edit");
         menubar.add(menu);
         menuitem = new JMenuItem("View FD");
         menu.add(menuitem);
         menuitem.addActionListener(this);
        mainpanel = new JPanel(new BorderLayout());
        menupanel = new JPanel(new BorderLayout());
        menupanel.add(menubar);
         userinputpanel = new JPanel(new GridLayout(8,2,5,20));
        userinputpanel.setBorder(BorderFactory.createEmptyBorder(50,50,80,80));
        userinputpanel.add(fdnumber);
        userinputpanel.add(fdnumbertxtfield);
        fdnumbertxtfield.setColumns(50);
        userinputpanel.add(bankname);
        userinputpanel.add(banknamecombobox);
        userinputpanel.add(beneficiaryname);
        userinputpanel.add(beneficiarynametxtfield);
        beneficiarynametxtfield.setColumns(50);
        userinputpanel.add(rateofinterest);
        userinputpanel.add(rateofinteresttxtfield);
        rateofinteresttxtfield.setColumns(50);
        userinputpanel.add(amount);
        userinputpanel.add(amounttxtfield);
        amounttxtfield.setColumns(50);
        userinputpanel.add(maturityamount);
        userinputpanel.add(maturityamounttxtfield);
        maturityamounttxtfield.setColumns(50);
        savebutton = new JButton("Save");
        clearbutton = new JButton("Clear");
        JPanel buttonpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        buttonpanel.add(savebutton);
        buttonpanel.add(clearbutton);
        savebutton.addActionListener(this);
        clearbutton.addActionListener(this);
        mainpanel.add(menupanel,BorderLayout.NORTH);
        mainpanel.add(userinputpanel,BorderLayout.CENTER);
        mainpanel.add(buttonpanel,BorderLayout.SOUTH);
        frame = new JFrame("Enter FD");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(3000,3000);
        frame.setContentPane(mainpanel);
        frame.pack();
        frame.setVisible(true); }