ComboBoxes.java Source code

Introduction

Here is the source code for ComboBoxes.java

Source

// : c14:ComboBoxes.java
// Using drop-down lists.
// <applet code=ComboBoxes width=200 height=125></applet>
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

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

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

public class ComboBoxes extends JApplet {
    private String[] description = { "Ebullient", "Obtuse", "Recalcitrant", "Brilliant", "Somnescent", "Timorous",
            "Florid", "Putrescent" };

    private JTextField t = new JTextField(15);

    private JComboBox c = new JComboBox();

    private JButton b = new JButton("Add items");

    private int count = 0;

    public void init() {
        for (int i = 0; i < 4; i++)
            c.addItem(description[count++]);
        t.setEditable(false);
        b.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (count < description.length)
                    c.addItem(description[count++]);
            }
        });
        c.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                t.setText("index: " + c.getSelectedIndex() + "   " + ((JComboBox) e.getSource()).getSelectedItem());
            }
        });
        Container cp = getContentPane();
        cp.setLayout(new FlowLayout());
        cp.add(t);
        cp.add(c);
        cp.add(b);
    }

    public static void main(String[] args) {
        run(new ComboBoxes(), 200, 125);
    }

    public static void run(JApplet applet, int width, int height) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(applet);
        frame.setSize(width, height);
        applet.init();
        applet.start();
        frame.setVisible(true);
    }
} ///:~