Java Examples in a Nutshell

Errata for Java Examples in a Nutshell

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The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color Key: Serious Technical Mistake Minor Technical Mistake Language or formatting error Typo Question Note Update



Version Location Description Submitted By Date Submitted Date Corrected
Printed
Page xiii
(This change was made to the 12/98 reprint but please note this

information if you have a previous printing of the book.) Under the section "Java Example Online," add the following section regarding licensing information: Licensing Information You may study, use, modify, and distribute these examples for any non-commercial purpose, as long as the copyright notice at the top of each example is retained. If you would like to use the code in a commercial product, you may purchase a commercial use license from the author for a nominal fee. Visit http://www.davidflanagan.com/javaexamples/ for information on obtaining such a license. Please note that the examples are provided as-is, with no warranty of any kind.

Anonymous   
Printed
Page xiii
1st para.: the correct URL for the examples is

http://www.oreilly.com/catalog/9781565923713

Anonymous    Apr 01, 1998
Printed
Page index
now starts on page 369 and has been

rerun to reflect the removal of the appendix

Anonymous    Dec 01, 1998
Printed
Page 1
last paragraph, second sentence: changed "They" to "There"

Anonymous    Apr 01, 1998
Printed
Page 1

The last paragraph did read : "There were referring, of course" now reads "They were referring, of course"

Anonymous    Apr 01, 2000
Printed
Page 6
Example 1-3: lines 8 and 9

int current, prev=1, prevprev=0; // Initialize some variables for(int i = 0; i < 20; i++) { // Loop exactly 20 times now reads int current, prev=1, prevprev=1; // Initialize some variables System.out.print("1 1 "); // Output the initial two values for(int i = 2; i < 20; i++) { // Loop, outputting remaining values and in the paragraph above, in line 5 "First, it again uses a for statement to loop 20 times." now reads "First, it again uses a for statement as its main loop."

Anonymous    Apr 01, 2000
Printed
Page 10
paragraph 2, line 4:

"So, in this examples" should be "So, in this example".

Anonymous   
Printed
Page 10
Example 1-8

if (x == 1) return 1; now reads: if (x <= 1) return 1;

Anonymous    Dec 01, 1998
Printed
Page 16
Example 1-13

line 24, changed if (c >= 'Z' ) c -= 26; to if (c > 'Z' ) c -= 26; and line 28, changed if (c >= 'z' ) c -= 26; to if (c > 'z' ) c -= 26;

Anonymous    May 01, 1998
Printed
Page 16
Example 1-13

line 24, changed if (c >= 'Z' ) c -= 26; to if (c > 'Z' ) c -= 26; and line 28, changed if (c >= 'z' ) c -= 26; to if (c > 'z' ) c -= 26;

Anonymous    Jun 01, 1998
Printed
Page 19
line 3:

"interatively" should be "interactively".

Anonymous   
Printed
Page 24

The end of example 2-4 now reads: public void draw(Graphics g) { g.setColor(fill); g.fillRect(x1, y1, (x2 - x1), (y2 - y1)); g.setColor(border); g.drawRect(x1, y1, (x2 - x1), (y2 - y1)); }

Anonymous    Apr 01, 1998
Printed
Page 27
Example 2-6

line 8, changed int seed = 1; to long seed = 1; line 13, changed public Randomizer(int seed) { this.seed = seed; } to public Randomizer(long seed) { this.seed = seed; } and line 36, changed Randomizer r= new Randomizer((int)new java.util.Date().getTime()); to Randomizer r= new Randomizer(new java.util.Date().getTime());

Anonymous    May 01, 1998
Printed
Page 27
Example 2-6

line 8, changed int seed = 1; to long seed = 1; line 13, changed public Randomizer(int seed) { this.seed = seed; } to public Randomizer(long seed) { this.seed = seed; } and line 36, changed Randomizer r= new Randomizer((int)new java.util.Date().getTime()); to Randomizer r= new Randomizer(new java.util.Date().getTime());

Anonymous    Jun 01, 1998
Printed
Page 27
Example 2-6, lines 32-33

inserted the word "the" between "and specified"

Anonymous    Dec 01, 1998
Printed
Page 41
Example 3-1: Added a closing " to the class-comment for "Hello

World!"

Anonymous    Apr 01, 1998
Printed
Page 42
second last line

font = new Font("Helvetica", Font.BOLD, 48); changed "Helvetica" to "sansserif"

Anonymous    Apr 01, 1998
Printed
Page 71
second paragraph. 4th sentence: changed "to created" to "to

create"

Anonymous    Apr 01, 1998
Printed
Page 84
Example 5-1, lines 1-2: changed

import java.applet.*; import java.awt.*; to import java.applet.*; import java.awt.*;

Anonymous    May 01, 1998
Printed
Page 84
Example 5-1, lines 1-2: changed

import java.applet.*; import java.awt.*; to import java.applet.*; import java.awt.*;

Anonymous    Jun 01, 1998
Printed
Page 90
1st para., line 2: changed "use it structure" to "use it to

structure"

Anonymous    Apr 01, 1998
Printed
Page 93
second last paragraph, line 1: changed "The adaptor class..." to

"The adapter class..."

Anonymous    Apr 01, 1998
Printed
Page 97
Example 5-7, line 4

* and keyboard events. This is a required or events won't be sent. should read * and keyboard events. This is required or events won't be sent.

Anonymous   
Printed
Page 99
example 5-9, line 5: changed "all the event" to "all the events"

Anonymous    Apr 01, 1998
Printed
Page 114
Example 6-5, replaced code with new code

import java.applet.*; import java.awt.*; import java.awt.event.*; public class CardLayoutExample2 extends Applet { public void init() { // Create a layout manager, and save a reference to it for future use. // This CardLayout leaves 10 pixels margins around the component. final CardLayout cardlayout = new CardLayout(10, 10); // Specify the layout manager for the applet this.setLayout(cardlayout); // Create a listener to invoke the next() method of cardlayout. ActionListener listener = new ActionListener() { public void actionPerformed(ActionEvent e) { // When button is clicked cardlayout.next(CardLayoutExample2.this); // display the next one. } }; for(int i = 1; i <= 9; i++) { Button b = new Button("Button #" + i); b.addActionListener(listener); this.add("Button" + i, b); // Specify a name for each component } } }

Anonymous    Dec 01, 1998
Printed
Page 114
The line

cardlayout.next(CardLayoutExample2.this); now reads cardlayout.next(CardLayoutExample.this);

Anonymous    Apr 01, 2000
Printed
Page 118
Example 6-7, line 10: changed

b.setBounds(i*26, i*18, 100, 25); // use reshape() in Java 1.1 to b.setBounds(i*26, i*18, 100, 25); // use reshape() in Java 1.0

Anonymous    May 01, 1998
Printed
Page 118
Example 6-7, line 10: changed

b.setBounds(i*26, i*18, 100, 25); // use reshape() in Java 1.1 to b.setBounds(i*26, i*18, 100, 25); // use reshape() in Java 1.0

Anonymous    Jun 01, 1998
Printed
Page 118
Example 6-8, header comments

*margin_height -- how much space...left and right *margin_width -- how much space...top and bottom now reads *margin_height -- how much space...top and bottom *margin_width -- how much space...left and right

Anonymous    Dec 01, 1998
Printed
Page 124
paragraph 1, line 1:

An important features of the Frame class ... should read An important feature of the Frame class ...

Anonymous   
Printed
Page 131
Example 6-13, changed the following line

Frame f = new Frame("InfoDialog Test"); To: Frame f = new Frame("YesNoDialog Test");

Anonymous    Dec 01, 1998
Printed
Page 139
under exercise 6-1, in the last sentence, changed "more" to

"move"

Anonymous    Apr 01, 1998
Printed
Page 158
Changed the line

// Ask whether to overwrite it System.out.print("Overwrite existing file " + to_name + "? (Y/N): "); To: // Ask whether to overwrite it System.out.print("Overwrite existing file " + to_file.getName() + "? (Y/N): "); Since this adds a line, we removed the blank line (to keep current page breaks) before: // If the destination is a directory, use the source file name

Anonymous    Dec 01, 1998
Printed
Page 161
FileViewer.java, in method setFile:

The program went into infinite loop when reading Japanese file. File f; FileReader in = null; try { f = new File(directory, filename); // Create a file object in = new FileReader(f); // Create a char stream to read it int size = (int) f.length(); // Check file size // This size is the file size in byte. ------(1) char[] data = new char[size]; // Allocate an array big enough for it int chars_read = 0; // How many chars read so far? while(chars_read < size) // Loop until we've read it all chars_read += in.read(data, chars_read, size-chars_read); // chars_read is total read size in unicode char ------(2) textarea.setText(new String(data)); // Display chars in TextArea this.setTitle("FileViewer: " + filename); // Set the window title } The author's response: This is an embarrassing mistake, and I am grateful to you for noticing it. In general, I have difficulty catching internationalization errors like this since I do not have a system that uses or can display Japanese text. (And even if I did, I could not develop meaningful examples, since I have no comprehension of the language...) Of the two solutions you propose, I prefer the first one. We should show an example that is guaranteed to work in all cases. However, to improve the efficiency, I would recommend that you modify the example to read more than one line at a time. You use a BufferedReader, which makes reading individual lines efficient, but I fear that appending individual lines to the TextArea is not efficient. So I propose code like this: f = new File(directory, filename); // Create a file object in = new FileReader(f); // Create a char stream to read it char[] buffer = new char[4096]; int len; while((len = in.read(buffer)) != -1) { String s = new String(buffer, 0, len); textarea.append(s); } Note that I have not tested this code, with English text or with Japanese text. I'm just trying to give you an idea of what I'm suggesting. I think this code is properly internationalized, and should always work. If it does not, go ahead and use the code you proposed.

Anonymous   
Printed
Page 163
paragraph 2, line 6:

"it creates and display a FileViewer window" should be "it creates and displays a FileViewer window".

Anonymous   
Printed
Page 191
Example 9-4, changed the following line

to_server.println("GET " + filename); to: to_server.println("GET " + filename + " ");

Anonymous    Dec 01, 1998
Printed
Page 197
Example 9-7, line 7

* This applet uses the connects to the ... now reads * This applet connects to the ...

Anonymous    Apr 01, 2000
Printed
Page 238
second text paragraph, changed

"manifest.stub" to "manifest" (keep in italics) Also, changed the following line: Name: oreilly/beans/MultiLineLabel.class To: Name: oreilly/beans/yesno/MultiLineLabel.class Finally, changed the following line: % jar cfm MultiLineLabel.jar manifest.stub oreilly/beans/MultiLineLabel.class To: % jar cfm MultiLineLabel.jar manifest oreilly/beans/yesno/MultiLineLabel.class

Anonymous    Dec 01, 1998
Printed
Page 258
Example 12-1, line 18

else if (c.getModifiers() != null) now reads else if (c.getSuperclass() != null)

Anonymous    Apr 01, 2000
Printed
Page 266
and (267) changed the following line

String filename = f.getFile(); // Get the user's response To: String filename = f.getDirectory() + f.getFile(); // Get response

Anonymous    Dec 01, 1998
Printed
Page 274
Example 14-1, removed the following line

import java.applet.*;

Anonymous    Dec 01, 1998
Printed
Page 296
para. 1, line 2-3:

... the 4.XX "RemoteBank interface" RemoteBank interface ... now reads ... the RemoteBank interface ...

Anonymous    Apr 01, 2000
Printed
Page 304
Example 15-4 removed the line: "import Mud.*;"

Anonymous    Dec 01, 1998
Printed
Page 304
para. 1, line 1:

Example 15-4 s.XX "remote method invocation(RMI)" "MudServer class" hows the ... now reads Example 15-4 shows the ...

Anonymous    Apr 01, 2000
Printed
Page 307
Example 15-5 same change

Anonymous    Dec 01, 1998
Printed
Page 314
Example 15-6 same change

Anonymous    Dec 01, 1998
Printed
Page 315
Example 15-7 same change

Anonymous    Dec 01, 1998
Printed
Page 328
Example 16-1, lines 27-28: changed

status = s.getMoreResults(); } while(status || s.getUpdateCount() != -1); to status = s.getMoreResults(); // With some buggy JDBC drivers, this condition causes an infinite // loop with SQL updates. If that happens, change to: while(status); } while(status || s.getUpdateCount() != -1); (removed blanks lines between lines 10 and 11 and between lines 24 and 25 to preserve the page breaks.)

Anonymous    May 01, 1998
Printed
Page 328
Example 16-1, lines 27-28: changed

status = s.getMoreResults(); } while(status || s.getUpdateCount() != -1); to status = s.getMoreResults(); // With some buggy JDBC drivers, this condition causes an infinite // loop with SQL updates. If that happens, change to: while(status); } while(status || s.getUpdateCount() != -1); (removed blanks lines between lines 10 and 11 and between lines 24 and 25 to preserve the page breaks.)

Anonymous    Jun 01, 1998
Printed
Page 330
After the line "Object value = rs.getObject(i+1);", added the line

if (value != null) and changed indentation of the next line so the code now reads: Object value = rs.getObject(i+1); if (value != null) overwrite(line, colpos[i] + 1, value.toString().trim()); (Don't change the indent of the second "overwrite" line.) Finally, since we added a line, we cut the blank line before: // Finally, end the table with one last divider line (appendix) completely removed

Anonymous    Dec 01, 1998
Printed
Page 381
Example 6, line 10 from the bottom: changed

// Add some items to the Edit menu to // Add some items to the View menu

Anonymous    May 01, 1998
Printed
Page 381
Example 6, line 10 from the bottom: changed

// Add some items to the Edit menu to // Add some items to the View menu

Anonymous    Jun 01, 1998