Errata for Building Java Programs

• Section 2.3
  • There is an expansion of the expression "4 * 5" that has an "8" instead of the "*". [Luke Weber]
• Section 2.3.3
  • The expression (2 + 3) * 4 should have been evaluated as follows: (2 + 3) * 4 = 5 * 4 = 20. The paragraph that follows correctly refers to the result as 20, although that was confusing because the calculation before the paragraph indicated that it had a result of 24. [Ethan Apter & Collin Seabourne]
• Section 2.3.4
  • The char literal 'a' is converted into the integer value 97, but when you multiply that by 2 you get 194, not 184. [Collin Seabourne]
  • A later part of this section incorrectly says that 'a' has integer value 95, which becomes 98 when you add 3 to it. It has integer value 97, so it becomes 100 when you add 3 to it, which is the integer value assigned to the character literal 'd'. [Collin Seabourne]
• Section 2.4.4
  • There is a missing semicolon for the last println that writes out "for the whole family!". [Rob Cromwell]
  • There is a similar missing semicolon later in the two println version of this. [Rob Cromwell]
• Section 2.5
  • There is a missing semicolon for the println of "+--------+" all four times that println appears. [Rob Cromwell]
• Section 2.5.1
  • There is a missing semicolon for the println of "Man!" both times it appears. [Rob Cromwell]
• Section 2.5.2
  • There is a for loop that says "int column:= 1" when it should say "int column = 1" (no colon). [Rob Cromwell]
• Section 2.5.3
  • There is a missing space in one of the for loops "int column= 1" which should be "int column = 1" (this won't prevent the code from working, but it isn't consistent with the rest of the code). [Rob Cromwell]
• Section 2.5.9
  • The sentence "We localize variables do avoid" should be "to avoid". [anonymous]
• Section 3.2
  • The sentence "We can so by passing a value" should be "We can do so by passing a value". [Collin Seabourne]
  • In the table of "Useful Methods in the Math Class" the example for the exp method should have been Math.exp(1), not Math.cos(1). [Kelsey Hutchins]
• Section 3.3 (Methods that Return Values)
  • The section is incorrectly listed as 3.4 (although the subsections are correctly listed as 3.3) [Reges & Jordan Gottlieb]
• Section 3.4.1
  • The sentence "For example, suppose that we have initialized two string variables as follows: code:" should not have the "code:". [Nathan Henninger]
• Section 3.4.4
  • The sentence "The situation is a more complicated for" should be "the situation is more complicated for" [Collin Seabourne]
• Section 5.2
  • The sentence "This loop executes a println statement repeatedly and increments number until is is greater than max" should be "until it is greater than max". [Collin Seabourne]
• Section 5.4
  • The section "Break and 'forever' loops" should be section 5.4.1 [Reges]
• Section 5.3
  • A sentence begins "The The" (there should be just one of these). [Collin Seabourne]
  • The table for logical or (||) is incorrectly labeled as being for logical and. [Patrick Lo]
• Section 6.3
  • The sentence, "As mentioned above, the getFile method is an example..." should read "the getInput method". [Su-San Lim]
• Section 6.4
  • The sentence, "This is a place place to introduce a static method" should have just one occurrence of "place". [Mei Liu]
  • The sentence, "The quality points are defined as the units time the grade" should be "units times the grade." [Chris Schlechty]
  • In the next sentence which begins "The weighted GPAs is calculated...", "GPAs" should be "GPA". [Kami Farrell]
  • There is a missing semicolon at the end of the line "double gpa = totalQualityPoints/totalUnits". [Mei Liu]
  • Later in the section there are if statements for computing the max and min gpa that need to be included inside the while loop of the method called "process", but they are not included in the actual program that appears after the sentence, "Putting this all together...". [Kami Farrell]
  • The comments for the program that appears after "Putting this all together..." are also incorrect. They should end with something like the following: [Mei Liu]

    //     Erica Kane
    //     3 2.8 4 3.9 3 3.1
    //     Greenlee Smythe
    //     3 3.9 3 4.0 4 3.9
    //     Ryan Laveree
    //     2 4.0 3 3.6 4 3.8 1 2.8
    //
    // The program reports the weighted GPA for each student along with the
    // max and min GPA.
    

• Section 7.2
  • A sentence has two occurrences of "quickly" when it should have one ("Java always allocates...which is what allows you to quickly access any element quickly"). [Rob Cromwell]
• Section 7.2.1
  • The sentence, "You can approach Pascal more by saying," should read, "You can approach Java more by saying". [Nathan Henninger]
  • The data file mentioned at the end is not included. The data is listed below. [Rob Cromwell]

    2 8 0 7 4 12 0 2 1 8 7 1 7 4 4 6 79 5 8 5 1 2 7 4 3 2 4
    2 7 0 4 5 4 10 2 0 275 93 1 5 4 5 6 8 1 2 6 -999 9 5 7
    0 64 3 4 2 3 10 2 4 9 0 5 3 -36 9 1 0 6 2 2 1 6 6 1 3 8 6
    

• Section 8.3.2
  • The sentence, "A stock object with symbol..." should have "Stock" capitalized. [Rob Cromwell]
  • The diagram at the end of the section incorrectly shows the data field myNumShares as having the value 50 when the paragraph before indicates that it should be 25. [Ethan Apter]
• Section 8.3.3
  • The first example of a constructor sets myCurrentPrice to price when it should set it to currentPrice. [Alicia Kellogg]
• Section 8.3.6
  • The sample output for a println is listed as "Stock3@80bee80" when it should be "Stock@80bee80" (the name of the class is Stock, not Stock3). [Marty Stepp]
• Section 8.3.7
  • There is a period missing at the end of the sentence, "This is another example of method overloading". [Rob Cromwell]
  • There is a comment "I own 0 Microsoft shares and 0 Google shares" which should read "I own 0 Microsoft shares and 50 Google shares". [Marty Stepp]
• Section 8.4
  • The code fragment that appears after the sentence, "The best way to enforce our precondition..." is formatted incorrectly. It should look like this: [Marty Stepp & Ethan Apter]

        public void recordPurchase(int numShares, double pricePerShare) {
            if (numShares < 0 || pricePerShare < 0)
                throw new IllegalArgumentException("negative shares or price");
    
            // The argument values are acceptable
            myNumShares += numShares;
            myTotalCost += numShares * pricePerShare;
        }
    

• Section 9.4
  • The sentence "One we've done this" should be "Once we've done this". [Rob Cromwell]