Errata

Missing "import javax.swing.*;" before "import java.awt.*;". If you place the HelloComponent in its own file the java compiler will not find JComponent as it is not in the java.awt name space.

The "HelloJava1" class in the diagram should be "HelloComponent." This is because in
the example code, HelloJava1 never inherits from JComponent, HelloComponent does.

HelloJava1 is shown. This should be HelloComponent.

The code snippet involves creating a socket with the IP address: 207.46.131.13. When
I tried the example it failed to connect; in fact, I couldn't even ping that address.
Consider using a URL that's more likely to be always-on (e.g., www.google.com). I
tried www.google.com instead and it worked.

Note from the Author or Editor:
to fix this we'd have to fix the images... let's defer.

States that @since only applies to variables, but I think that it also applies to classes and methods as well.

You write:

"In the simplest case, supposing an ObjectList type extends a DateList type, the DateList would have all of the methods of ObjectList [...]"

ObjectList and DateList should be switched to render:

"In the simplest case, supposing a DateList type extends an ObjectList type, the DateList would have all of the methods of ObjectList [...]"

(This was already reported, but remains unconfirmed because of the erroneous page number. The page number given is for the 4th edition of the book; I have also confirmed this error in the 3rd print edition, on page 224.)

In the while loop of the getMessage() method, you call a notify(). This is probably useless. Notify can only wake up the producer as getMessage() is only called by the consumer.

The producer goes to wait when the queue has more than five messages. The condition to enter the while loop is an empty queue. Both conditions are never met together.

(Page 233 in the printed version of the third edition. Location given above is for the fourth edition.)

"Wildcard bounds may extend interfaces as well as use the & syntax to add interface requirements to the bound:

`Trap< ? extends Catchable & Releaseable > trap;`

In this case, the instantiation serves as a supertype of the set of instantiations on types implementing both the Catchable and Releaseable interfaces."

This section is incorrect--wildcard bounds are restricted to a single type. It should be changed to reflect this.

In the section "Why isn't a List<Date> a List<Object>, you write:
..., supposing an ObjectList type extends a DateList type, the DateList would have all of the methods of ObjectList ...

I think you should have written:
... supposing a DateList type extends an ObjectList type ...

(I gave a false page number above, as the online form requires a page number but my e-book version does not display page numbers)

Line # 5 contains "File file = new File(args[0]);"
Line # 14 contains "for(String file : files)"

This causes a syntax error with the compiler:
"file is already defined in main(java.lang.String[]) for (String file : files)"

Changed Line #14 to "for(String curfile: files)" and Line #15 from "System.out.println(file);" to "System.out.println(curfile);".

It compiles correctly with this change.

Two logical lines have unmatched types:
FileInputStream xOut = new FileOutputStream(...);
where x is 'foo' or 'pwd'

Should be:
FileOutputStream xOut = new FileOutputStream(...);