list.java

简单的Java Gui,用Java编辑器真接打开

//: c13:List.java
// <applet code=list width=250
// height=375> </applet>

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import com.bruceeckel.swing.*;

public class List extends JApplet
{
	String[] flavors = {"Chocolaate", "Strawberry", 
		"Vanilla Fudge Swirl", "Mint Chip", 
		"Mocha Almond Fudge", "Rum Raisin", 
		"Praline Cream", "Mud Pie"};
	DefaultListModel lItems = new DefaultListModel();
	JList lst = new JList(lItems);
	JTextArea t = new JTextArea(flavors.length, 20);
	JButton b = new JButton("Add Item");
	
	ActionListener bl = new ActionListener()
	{
		public void actionPerformed(ActionEvent e)
		{
			if (count < flavors.length)
			{
				lItems.add(0, flavors[count++]);
			}
			else
			{
				// Disable, since there are no more
				// flavors left to be added to the List
				b.setEnabled(false);	
			}
		}
	};
	
	ListSelectionListener ll = 
		new ListSelectionListener()
		{
			public void valueChanged(ListSelectionEvent e)
			{
				t.setText("");
				Object[] items = lst.getSelectedValues();
				
				for (int i=0; i<items.length; i++)
				{
					t.append(items[i] + "\n");	
				}
			}
		};
	
	int count = 0;
	
	public void init()
	{
		Container cp = getContentPane();
		t.setEditable(false);
		cp.setLayout(new FlowLayout());
		
		// Create Borders for components
		Border brd = BorderFactory.createMatteBorder(
			1, 1, 2, 2, Color.black);
		lst.setBorder(brd);
		
		// Add the first four items to the List
		for (int i=0; i<4; i++)
		{
			lItems.addElement(flavors[count++]);
		}	
		
		//Add items to the Content Pane for Display
		cp.add(t);
		cp.add(lst);
		cp.add(b);
		
		// Register event listeners
		lst.addListSelectionListener(ll);
		b.addActionListener(bl);
	}
	
	public static void main(String[] args)
	{
		List applet = new List();
		JFrame frame = new JFrame("List");
		frame.getContentPane().add(applet);
		frame.setSize(250, 375);
		applet.init();
		applet.start();
		frame.setVisible(true);
	}
}///:~