comboboxes.java

简单的Java Gui,用Java编辑器真接打开

//: c13:ComboBoxes.java
// Using drop-down lists.
// <applet code=ComboBoxes
// width=200 heigh=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)
	{
		ComboBoxes applet = new ComboBoxes();
		JFrame frame = new JFrame("ComboBoxes");
		frame.getContentPane().add(applet);
		frame.setSize(200, 100);
		applet.init();
		applet.start();
		frame.setVisible(true);
	}
}///:~