ComboBoxes.java

//: c13:ComboBoxes.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Using drop-down lists.
// <applet code=ComboBoxes
// width=200 height=100> </applet>
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import com.bruceeckel.swing.*;

public class ComboBoxes extends JApplet {
  String[] description = { "Ebullient", "Obtuse",
    "Recalcitrant", "Brilliant", "Somnescent",
    "Timorous", "Florid", "Putrescent" };
  JTextField t = new JTextField(15);
  JComboBox c = new JComboBox();
  JButton b = new JButton("Add items");
  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) {
    Console.run(new ComboBoxes(), 200, 100);
  }
} ///:~