MyComboBoxModel.java Source code

Introduction

Here is the source code for MyComboBoxModel.java

Source

import javax.swing.AbstractListModel;
import javax.swing.ComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;

class MyComboBoxModel extends AbstractListModel implements ComboBoxModel {
    String[] ComputerComps = { "Monitor", "Key Board", "Mouse", "Joy Stick", "Modem", "CD ROM", "RAM Chip",
            "Diskette" };

    String selection = null;

    public Object getElementAt(int index) {
        return ComputerComps[index];
    }

    public int getSize() {
        return ComputerComps.length;
    }

    public void setSelectedItem(Object anItem) {
        selection = (String) anItem; // to select and register an
    } // item from the pull-down list

    // Methods implemented from the interface ComboBoxModel
    public Object getSelectedItem() {
        return selection; // to add the selection to the combo box
    }
}

public class JComboBoxModel {

    public static void main(String[] a) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JComboBox cbox = new JComboBox(new MyComboBoxModel());
        cbox.setMaximumRowCount(5);
        frame.add(cbox);

        frame.setSize(300, 200);
        frame.setVisible(true);
    }

}