Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.ItemSelectable;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.event.EventListenerList;

public class Main {
    public static void main(String[] argv) throws Exception {
        MyComponent component = new MyComponent();
        JFrame f = new JFrame();

        f.add(component);
        f.setSize(300, 300);
        f.setVisible(true);

    }
}

class MyComponent extends JTextField implements ItemSelectable {
    protected EventListenerList listenerList = new EventListenerList();

    public Object[] getSelectedObjects() {
        return new String[] { "a", "b", "c" };
    }

    public void addItemListener(ItemListener l) {
        listenerList.add(ItemListener.class, l);
    }

    public void removeItemListener(ItemListener l) {
        listenerList.remove(ItemListener.class, l);
    }

    void fireItemEvent(Object item, boolean sel) {
        ItemEvent evt = new ItemEvent(this, ItemEvent.ITEM_STATE_CHANGED, item,
                sel ? ItemEvent.SELECTED : ItemEvent.DESELECTED);

        Object[] listeners = listenerList.getListenerList();

        for (int i = 0; i < listeners.length - 2; i += 2) {
            if (listeners[i] == ItemListener.class) {
                ((ItemListener) listeners[i + 1]).itemStateChanged(evt);
            }
        }
    }
}