how yo populate a combo box in java using a loop of an aray of objects

how yo populate a combo box in java using a loop of an aray of objects

      else if (e.getSource() instanceof JComboBox)

                      // JComboBox jBox = (JComboBox)e.getSource();
                           //itemSelected= (String) jBox.getSelectedItem();
                           index= jBox.getSelectedIndex();

                           cars[numVideos]=new Car("Dodge","Viper","2003",3112.99);


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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ComboBoxDemo extends JPanel {
    JLabel picture;

    public ComboBoxDemo() {
        String[] petStrings = { "Bird", "Cat", "Dog", "Rabbit", "Pig" };

        // Create the combo box, select the pig
        JComboBox petList = new JComboBox(petStrings);
        petList.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                JComboBox cb = (JComboBox)e.getSource();
                String petName = (String)cb.getSelectedItem();
                picture.setIcon(new ImageIcon("images/" + petName + ".gif"));

        // Set up the picture
        picture = new JLabel(new ImageIcon("images/" +
                                   petStrings[petList.getSelectedIndex()] +

        // The preferred size is hard-coded to be the width of the
        // widest image and the height of the tallest image + the border.
        // A real program would compute this.
        picture.setPreferredSize(new Dimension(177, 122+10));

        // Layout the demo
        setLayout(new BorderLayout());
        add(petList, BorderLayout.NORTH);
        add(picture, BorderLayout.SOUTH);

    public static void main(String s[]) {
        JFrame frame = new JFrame("ComboBoxDemo");

        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
        frame.getContentPane().add(new ComboBoxDemo(), BorderLayout.CENTER);

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