Agile Java Errata

14

Technically, the Agile Java definition of encapsulation is that of information hiding. A more precise definition of encapsulation is "the inclusion of both the methods and the data within an object." The Agile Java definition is still correct but is closer to the more generalized definition of encapsulation: "the incl1usion of one thing within another so that the included thing is not apparent." (See http://whatis.com.)

14

In the first paragraph, "I send you a message to you" should read "I send you a message."

45

The first sentence of the first paragraph is more accurately written as: "In the second statement, Java assigns the memory address of this returned String object to a String local variable, defined on the left hand of the statement as studentName."

45

The caret in the first compilation error listing should appear directly beneath the letter s in student.getName().

17

The footnote reference should be [Fowler2003], not [Fowler2000].

62

"Exercises appear at the end of lesson" should read "Exercises appear at the end of each lesson."

77

In the first paragraph, replace:
Each time the getNumberOfStudents message is sent
with:
Each time the getAllStudents message is sent

77

In Figure 2.4, the variable names listed in the table to the right should read student1 and student2.

80

Second to last sentence on the page, "CourseSesson" should be "CourseSession."

91

The header for the page should read "Deprecation Warnings," not "Depreciation Warnings."

100

The reference to TestPawn in exercises 1 should be changed to PawnTest.

101

The reference to TestPawn in exercises 7 should be changed to PawnTest.

113

In the third bullet, replace:
testReport constructs its own CourseSession object
with:
testRosterReport constructs its own CourseSession object

116

In the code for testCreateDate, replace:
Calendar calendar = new GregorianCalendar();
with:
GregorianCalendar calendar = new GregorianCalendar();
(I haven't talked about assignments to the interface type yet.)

120

replace:
If you haven't already done so, remove the testReport method from CourseSessionTest
with:
If you haven't already done so, remove the testRosterReport method from CourseSessionTest

120

replace:
you can decompose the code in writeReport
with:
you can decompose the code in getReport

121

At the start of the third paragraph, replace:
move the studentinfo package down a level so that it is in a package named sis.reportinfo.
with:
move the studentinfo package down a level so that it is in a package named sis.studentinfo.

123

In the last paragraph, first sentence, replace:
from the code in the reports package
with:
from the code in the report package
Also make the same replacement in the second paragraph on the page.

139

The first sentence of the 2nd paragraph should read "The CourseSessionTest method testCount..."

141

The code should use the newer construct session = createCourseSession(); instead of CourseSession.create(...)

144

In the third paragraph, "Supplies a a shortcut" should read "Supplies a shortcut."

169

The first sentence of the first paragraph should read "You can use interfaces to break dependencies..."

170

In the sidebar "More on this," replace:
In the Student compareTo method
with:
In the CourseSession compareTo method

180

The Student class declaration should not include the clause implements Comparable<Student>

186

The text in the first paragraph:
"Modify the Student code to obtain grade points by sending the gradePointsFor message"
should read:
"Modify the Student code to obtain grade points by sending the getGradePointsFor message"

187

The Student class declaration should not include the clause implements Comparable<Student>

199

In the final paragraph in the Maps section, replace
Add a new class named ReportCardTest to the sis.reports package.
with:
Add a new class named ReportCardTest to the sis.report package.

202

The last sentence in the first paragraph should read "As a subclass, each of RegularGradingStrategy and HonorsGradingStrategy obtain all of the behaviors of BasicGradingStrategy."

228

In the proposed example code, replace:
Session session = createSession(new Date());
with:
Session session = createSession("", "", new Date());
Better yet would be to add a createSession helper method that takes no arguments.

228

The first line in the second paragraph:
"The test method testCourseDates appears in both SessionTest subclasses."
should probably read:
"The need to verify the end date for a course is captured in tests for both subclasses: testEndDates in SummerCourseSessionTest and testCourseDates in CourseSessionTest."

234

The while loop example uses a StringBuffer instead of a StringBuilder. This really isn't a problem since we've already discussed StringBuffer, but under J2SE 5.0 you will probably want to prefer use of the new StringBuilder class.

234

The tokenize method at the bottom of the page should be named split.

235

Eliminate the line comment from the first code listing.

238

In the for loop statement in isPalindrome, the code should read:

 forward++, backward--)

i.e. with two hyphens (minus signs) after backward. (It actually does have two hyphens, but the typeface used makes them appear as one.)

242

Fibonacci is a bad, bad example to use for recursion. Write a test that determines fib(100) and see how long it takes.

246

The footnote should refer to BitSet, not "BitSit."

273

"CheckedExceptinos" should be "CheckedExceptions."

338

After adding testKeys, getMessages method should be changed to public.

342

In Table 9.1, the entry for "range" is blank (and "range" should be in the sans serif font). The entry should read "Creates an enum set initially containing all of the elements in a from-to enum range."

372

The story icon should appear beside the following paragraph, the one that starts with "You must assign passwords to students..."

374

In the last paragraph, replace java.util.SecureRandom with java.security.SecureRandom.

441

In the first code listing on the page, the assertion should read: assertTrue(classes.contains("sis.testing.SuiteBuilderTest.class"));

444

Add the following code to the listing:

public TestSuite suite() {
   TestSuite suite = new TestSuite();
   for (String className: gatherTestClassNames()) {
      Class klass = createClass(className);
      suite.addTestSuite(klass);
   }
   return suite;
}

479

"The end balance should be $0." should read "The end balance should be $20."

528

"You can quickly add some time safety" should be "You can quickly add some type safety"

597

The bottom compartment in the diagram shown in Figure 6 should read "South." Duh.

690

In the second line of the static initializer, the string literal should end with \\n instead of \\.

693

The method getErrorOutput should return errorOutput.toString(), not output.toString().

705

With respect to the definition for encapsulation, see the errata entry above for page 14.

733

[Bloch2001] should show Bloch, Joshua as the author of Effective Java Programming Language Guide

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