Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Component;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;

public class Main {
    private static JButton getButtonSubComponent(Container container) {
        if (container instanceof JButton) {
            return (JButton) container;
        } else {
            Component[] components = container.getComponents();
            for (Component component : components) {
                if (component instanceof Container) {
                    return getButtonSubComponent((Container) component);
                }
            }
        }
        return null;
    }

    public static void main(String[] args) {
        JComboBox<String> combo = new JComboBox<>(new String[] { "One", "Two", "Three" });
        JButton arrowBtn = getButtonSubComponent(combo);
        if (arrowBtn != null) {
            arrowBtn.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    System.out.println("arrow button pressed");
                }
            });
        }
        JFrame f = new JFrame();
        f.getContentPane().add(combo);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.pack();
        f.setVisible(true);
    }
}