Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.util.ArrayList;
import java.util.Collection;

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

public class Main {
    public static void main(String args[]) {
        JFrame frame = new JFrame("ArrayListComboBoxModel");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Collection<Object> col = System.getProperties().values();
        ArrayList<Object> arrayList = new ArrayList<Object>(col);
        ArrayListComboBoxModel model = new ArrayListComboBoxModel(arrayList);

        JComboBox comboBox = new JComboBox(model);

        frame.add(comboBox, BorderLayout.NORTH);
        frame.setSize(300, 225);
        frame.setVisible(true);
    }
}

class ArrayListComboBoxModel extends AbstractListModel implements ComboBoxModel {
    private Object selectedItem;

    private ArrayList anArrayList;

    public ArrayListComboBoxModel(ArrayList arrayList) {
        anArrayList = arrayList;
    }

    public Object getSelectedItem() {
        return selectedItem;
    }

    public void setSelectedItem(Object newValue) {
        selectedItem = newValue;
    }

    public int getSize() {
        return anArrayList.size();
    }

    public Object getElementAt(int i) {
        return anArrayList.get(i);
    }
}