CS 106A: Programming Methodology (Java)
Spring 2015

Pre-section problem: Solve the following problem on paper (hand-written or printed) and bring your sheet of paper to your section. This problem does not come from the textbook.

1. Write a graphical program that displays a text label with the text, "All WORK and no PLAY makes JACK a dull BOY." (This quote comes from the classic movie, The Shining.) Place the label in the northern area of the window. Also add three buttons to the southern area of the window that have the following behavior:
   • Lowercase: Converts the onscreen label to lowercase.
   • Cool: Changes the word "dull" to "cool" in the label text, leaving the other text unchanged.
   • Red: Makes the window's background color become red.

   The following screenshots show the effects of these buttons.

   

   Assume that you are starting from the given skeleton program. Our own solution adds 14 total lines of code to the skeleton below: one field, 6 lines in init, and 7 lines in actionPerformed. (You can also download the code below if you want to type it in.)

   public class Shining extends Program {
       // fields
   
       public void init() {
           // TODO: implement
   
       }
   
       public void actionPerformed(ActionEvent event) {
           // TODO: implement
   
       }
   }
   

• section07-code.zip (If you want to type it up, optionally. Make sure to bring a paper printed copy no matter what.)

Pre-section problem: Solve the following book exercise problem on paper (hand-written or printed) and bring your sheet of paper to your section:

1. a variation of Exercise 11.2 (p451) - "In statistics, a collection of data values is ..."

   The book exercise says to accept an array of double as your parameter. But instead, write a version that accepts an ArrayList of doubles. If the list is empty, your method should return 0.0. The book also says to test your method by incorporating it into a GymnasticsJudge program; you don't need to do that. If you want to test your code, download our ZIP file below.

• section05-code.zip (If you want to type it up, optionally. Make sure to bring a paper printed copy no matter what.)

Pre-section problem: Solve the following book exercise problem on paper (hand-written or printed) and bring your sheet of paper to your section:

1. Exercise 8.6 (p287) - "A palindrome is a word that ..." Just write the method itself; you don't need to write the test program mentioned in the problem statement. Consider any one-letter or empty string to be a palindrome. If you want to extend the code to work for full sentences with spaces and punctuation as described in Exercise 8.7, feel free to do so, but that is optional.

• section04-code.zip (If you want to type it up, optionally. Make sure to bring a paper printed copy no matter what.)

Pre-section problem: Solve the following book exercise problem on paper (hand-written or printed) and bring your sheet of paper to your section:

1. Exercise 5.4 (p172) - "Write a method countDigits(n) that ..." (See book Figure 4-6 for a helpful example to get you started. Can you write a version that handles negative numbers?)

• section03-code.zip (If you want to type it up, optionally. Make sure to bring a paper printed copy no matter what.)

Pre-section problem: Solve the following book exercise problem on paper (hand-written or printed) and bring your sheet of paper to your section:

1. a variation of Exercise 4.4 (p128) - "Write a program that displays the integers between ..."

   Write a variation of the book's exercise where you print all of the numbers in the range, separated by spaces. Use a loop to print the numbers. But for multiples of three print "Fizz" instead of the number, and for the multiples of five print "Buzz". For numbers which are multiples of both three and five print "FizzBuzz". The output would be:

   1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 FizzBuzz 16 17 Fizz 19 Buzz
   Fizz 22 23 Fizz Buzz 26 Fizz 28 29 FizzBuzz 31 32 Fizz 34 Buzz Fizz 37 38 Fizz
   Buzz 41 Fizz 43 44 FizzBuzz 46 47 Fizz 49 Buzz Fizz 52 53 Fizz Buzz 56 Fizz 58
   59 FizzBuzz 61 62 Fizz 64 Buzz Fizz 67 68 Fizz Buzz 71 Fizz 73 74 FizzBuzz 76
   77 Fizz 79 Buzz Fizz 82 83 Fizz Buzz 86 Fizz 88 89 FizzBuzz 91 92 Fizz 94 Buzz
   Fizz 97 98 Fizz Buzz 
   

   ("FizzBuzz" is a commonly known problem. Many companies actually ask their interview candidates to solve it, and surprisingly a large number of applicants are unable to do so. It's considered a good "weed-out" problem because anybody with a CS degree ought to know how to solve a problem like this.)

You can just write out the code by hand and make your best attempt to solve the problem. If you want to actually code up the solution in Eclipse, you can do so using our starter project ZIP below, but you don't have to do so. If you type it in, you'll need to print it out or rewrite it by hand so that you can turn it in on paper at your section; we do not accept it digitally such as by email. If you like, you do not need to write a complete program; just the relevant lines of code to answer the question. (See detailed information below about pre-section problems.)

Keep in mind that these pre-section problems are meant to be short warm-up drills to get you ready for section. They are not meant to take a large amount of time or cause you undue stress. If you're taking more than 15-20 minutes on this problem, you can stop and give your partial work to your SL and you will receive credit.

• section02-code.zip

Solve the following book exercise problem on paper (hand-written or printed) and bring your sheet of paper to your section:

1. Review question 3.7 (p90) - "By applying the appropriate precedence rules, calculate the result of each of the following expressions: ..." Solve all of parts a) - d). Show your work by writing out each expression part that is evaluated in order. For example:

   1 + 2 * 3 + 4
       -----
   1 +   6   + 4
   -------
      7      + 4
      ----------
          11
   

You can just write the answer(s) by hand and make your best attempt to solve them.

(The "Section 1 Handout" problems from the PDF document above are the problems that you'll work on in your section this week with the section leader. You don't need to work on any of those before your section, though you can optionally read them ahead of time if you like.)

• section01-code.zip