Using drop-down lists : ComboBox « Swing JFC « Java





Using drop-down lists

Using drop-down lists
  

// : 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);
  }
} ///:~


           
         
    
  










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