Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.GridBagLayout;
import java.util.Random;

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

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new TestPane());
        frame.pack();
        frame.setVisible(true);
    }
}

class TestPane extends JPanel {
    JComboBox comboBox;
    JButton update;

    public TestPane() {
        setLayout(new GridBagLayout());
        update = new JButton("Update");
        comboBox = new JComboBox();

        update.addActionListener(e -> updateCombo());
        updateCombo();

        add(comboBox);
        add(update);
    }

    void updateCombo() {
        DefaultComboBoxModel model = new DefaultComboBoxModel();
        Random rnd = new Random();
        for (int index = 0; index < 10 + rnd.nextInt(90); index++) {
            model.addElement(rnd.nextInt(1000));
        }
        comboBox.setModel(model);
    }

}