《Java2图形设计卷II：Swing》配套光盘源码

				import java.awt.*;
				import java.awt.event.*;
				import javax.swing.*;
				import javax.swing.text.*;
				import java.io.FileReader;
				
				public class Test extends JApplet {
					private JTextArea textArea = new JTextArea();
					private Container contentPane = getContentPane();
				
					public void init() {
						readFile(textArea, "text");
						contentPane.add(new ControlPanel(), BorderLayout.NORTH);
						contentPane.add(new JScrollPane(textArea), 
										BorderLayout.CENTER);
					}
					private void readFile(JTextComponent textComponent,String s) {
						try { (new DefaultEditorKit()).read(
							   new FileReader(s), textComponent.getDocument(), 0);
						} catch(Exception ex) { ex.printStackTrace(); }
					}
					class ControlPanel extends JPanel { 
						JRadioButton radioButtons[] = new JRadioButton[] {
							new JRadioButton("wrap off"),
							new JRadioButton("wrap characters"),
							new JRadioButton("wrap words"),
						};
				
						public ControlPanel() {
							ButtonGroup group = new ButtonGroup();
							Listener listener = new Listener();
				
							for(int i=0; i < radioButtons.length; ++i) {
								JRadioButton b = radioButtons[i];
				
								b.addActionListener(listener);
								group.add(b);
								add(b);
				
								if(i == 0) 
									b.setSelected(true); // "wrap off"
							}
						}
						class Listener implements ActionListener {
							public void actionPerformed(ActionEvent e) {
								String action = e.getActionCommand();
				
								textArea.setLineWrap(!action.equals("wrap off"));
								textArea.setWrapStyleWord(
													action.equals("wrap words"));
								//textArea.repaint();
				
								showStatus("rows: " + textArea.getRows() +
									", columns: " + textArea.getColumns() +
									", lines: " + textArea.getLineCount());
				
							}
						};
					}
				}