COE 212 Problems Chapter 2 Solutions, Spring 2013

6th Edition, Java Software Solutions Disclaimer: In what follows, you will find the solutions to the exercises given in the 6th edition of the book. If you happen to be using an earlier edition of the book, you should match each one of the problems presented below to the proper exercise in the book that you have. So keep in mind that the order in which the solutions are listed may not agree with the order of the exercises in your book. Chapter 2 Exercise Solutions EX 1.1. Explain the following programming statement in terms of objects and the services they provide. System.out.println ("I gotta be me!"); The System.out object has a println method which accepts a string, enclosed in parentheses and quotation marks, which it displays on the monitor. EX 1.2. What output is produced by the following code fragment? Explain. System.out.print ("Here we go!"); System.out.println ("12345"); System.out.print ("Test this if you are not sure."); System.out.print ("Another."); System.out.println (); System.out.println ("All done."); The output produced is: Here we go!12345 Test this if you are not sure.Another. All done. After printing its data, the println method moves to the next line of output, whereas the print method does not. A println statement with no data has the effect of moving down to the next line. EX 1.3. What is wrong with the following program statement? How can it be fixed? System.out.println ("To be or not to be, that is the question."); The string to be printed is not all on one line. The problem can be fixed by using the string concatenation operator (+) or by using a print statement for part of the string and a println statement for the remainder of the string. EX 1.4. What output is produced by the following statement? Explain. System.out.println ("50 plus 25 is " + 50 + 25); The output produced is: 50 plus 25 is 5025 6th Edition, Java Software Solutions First the string “50 plus 25” is concatenated with the integer 50; since one of the operands associated with the “+” operator is a string, the result is a string. Then the string “50 plus 25 is 50” is concatenated with the integer 25, with similar results. EX 1.5. What is the output produced by the following statement? Explain. System.out.println ("He thrusts his fists\n\tagainst" + " the post\nand still insists\n\the sees the \"ghost\""); The output produced is: He thrusts his fists against the post and still insists he sees the "ghost" Escape characters are used to go to the beginning of new lines (\n), to tab (\t), and to print quotation marks (\"). EX 1.6. What value is contained in the integer variable size after the following statements are executed? size = 18; size = size + 12; size = size * 2; size = size / 4; The final value stored in size is 15. EX 1.7. What value is contained in the floating point variable depth after the following statements are executed? depth = 2.4; depth = 20 – depth * 4; depth = depth / 5; The final value stored in depth is 2.08. EX 1.8. What value is contained in the integer variable length after the following statements are executed? length = 5; length *= 2; length *= length; length /= 100; The final value stored in length is 1. EX 1.9. Write four different program statements that increment the value of an integer variable total. total = total + 1; total += 1; total++; ++total; 6th Edition, Java Software Solutions EX 1.10. Given the following declarations, what result is stored in each of the listed assignment statements? int iResult, num1 = 25, num2 = 40, num3 = 17, num4 = 5; double fResult, val1 = 17.0, val2 = 12.78; a. iResult = num1 / num4; iResult is assigned 5 b. fResult = num1 / num4; fResult is assigned 5.0 c. iResult = num3 / num4; iResult is assigned 3 d. fResult = num3 / num4; fResult is assigned 3.0 e. fResult = val1 / num4; fResult is assigned 3.4 f. fResult = val1 / val2; fResult is assigned 1.3302034... g. iResult = num1 / num2; iResult is assigned 0 h. fResult = (double) num1 / num2; fResult is assigned 0.625 i. fResult = num1 / (double) num2; fResult is assigned 0.625 j. fResult = (double) (num1 / num2); fResult is assigned 0.0 k. iResult = (int) (val1 / num4); iResult is assigned 3 l. fResult = (int) (val1 / num4); fResult is assigned 3.0 m. fResult = (int) ((double) num1 / num2); fResult is assigned 0.0 n. iResult = num3 % num4; iResult is assigned 2 o. iResult = num 2 % num3; iResult is assigned 6 p. iResult = num3 % num2; iResult is assigned 17 q. iResult = num2 % num4; 6th Edition, Java Software Solutions iResult is assigned 0 EX 1.11. For each of the following expressions, indicate the order in which the operators will be evaluated by writing a number beneath each operator. a. a – b – c – d 1 2 3 b. a – b + c – d 1 2 3 c. a + b / c / d 3 1 2 d. a + b / c * d 3 1 2 e. a / b * c * d 1 2 3 f. a % b / c * d 1 2 3 g. a % b % c % d 1 2 3 h. a – (b – c) – d 2 1 3 i. (a – (b – c)) – d 2 1 3 j. a – ((b – c) – d) 3 1 2 k. a % (b % c) * d * e 2 1 3 4 l. a + (b – c) * d – e 3 1 2 4 m. (a + b) * c + d * e 1 2 4 3 n. (a + b) * (c / d) % e 1 3 2 4 EX 1.12. Explain the role played by the World Wide Web in the translation and execution of some Java programs. Java applets are designed to be moved across the web and executed in a browser. The applet source code is compiled into Java bytecode which is sent across the Internet using HMTL and the World Wide Web software. A Web browser with a Java interpreter interprets and execute the bytecode. 6th Edition, Java Software Solutions EX 1.13. Compare and contrast a traditional coordinate system and the coordinate system used by Java graphical components. A traditional coordinate system has the origin in the lower-left corner, with x increasing to the right and y increasing upward. The coordinate system used by Java has the origin in the upper-left corner with x increasing to the right and y increasing downward. EX 1.14. How many bits are needed to store a color picture that is 400 pixels wide and 250 pixels high? Assume color is represented using the RGB technique described in this chapter and that no special compression is done. Allowing 8 bits for each of the 3 (red, green, and blue) color components of each of 400 x 250 pixels comprising the picture means that 8 x 3 x 400 x 250 = 2,400,000 bits are needed. EX 1.15. Assuming you have a Graphics object called page, write a statement that will draw a line from point (20, 30) to point (50, 60). page.drawLine(20,30,50,60); EX 1.16. Assuming you have a Graphics object called page, write a statement that will draw a rectangle with height 70 and width 35, such that its upper left corner is at point (10, 15). page.drawRect(10,15,35,70); EX 1.17. Assuming you have a Graphics object called page, write a statement that will draw a circle centered on point (50, 50) with a radius of 20 pixels. page.drawOval(30,30,40,40); EX 1.18. The following lines of code draw the eyes of the snowman in the Snowman applet. The eyes seem centered on the face when drawn, but the first parameters of each call are not equally offset from the midpoint. Explain. page.fillOval (MID-10, TOP+10, 5, 5); page.fillOval (MID+5, TOP+10, 5, 5); The first parameter specifies the upperleft corner of the eyes, not the center of the eyes. The eyes are circles of diameter 5. Hence, the center of the first eye is –10 + 2.5 = -7.5 units to the left of MID, and the second eye is 5 + 2.5 = 7.5 units to the right of MID. Chapter 2 Programming Projects Solutions PP2.1 Refer to Lincoln4.java in the folder named “chap02 pp solutions” PP2.2 Refer to AverageOfThree.java in the folder named “chap02 pp solutions” PP2.3 Refer to FloatCalculations.java in the folder named “chap02 pp solutions” PP2.4 Refer to TempConverter2.java in the folder named “chap02 pp solutions” PP2.5 Refer to MilesToKilometers.java in the folder named “chap02 pp solutions” PP2.6 Refer to Seconds.java in the folder named “chap02 pp solutions” 6th Edition, Java Software Solutions PP2.7 Refer to Seconds2.java in the folder named “chap02 pp solutions” PP2.8 Refer to ChangeCounter.java in the folder named “chap02 pp solutions” PP2.9 Refer to MoneyConversion.java in the folder named “chap02 pp solutions” PP2.10 SquareCalculations.java in the folder named “chap02 pp solutions” PP2.11 Fraction.java in the folder named “chap02 pp solutions” PP2.12 Snowman2.java and Snowman2.html PP2.13 DrawName.java and DrawName.html PP2.14 BigDipper.java and BigDipper.html PP2.15 Balloons.java and Ballons.html PP2.16 OlympicRings.java and OlympicRings.html PP2.17 HousePicture.java and HousePicture.html PP2.18 BusinessCard.java and BusinessCard.html PP2.19 ShadowName.java and ShadowName.html PP2.20 PieChart.java and PieChart.html //******************************************************************** // AverageOfThree.java Author: Lewis and Loftus // // Solution to Programming Project 2.2 (5th Ed, p. 107) //******************************************************************** import java.util.Scanner; class AverageOfThree { //----------------------------------------------------------------- // Reads three integers from the user and prints their average. //----------------------------------------------------------------- public static void main (String[] args) { int num1, num2, num3; double average; Scanner scan = new Scanner (System.in); System.out.print ("Enter the first number: "); num1 = scan.nextInt(); System.out.print ("Enter the second number: "); num2 = scan.nextInt(); System.out.print ("Enter the third number: "); num3 = scan.nextInt(); average = (double) (num1+num2+num3) / 3; System.out.println ("The average is: " + average); } } //******************************************************************** // AverageOfThree2.java Author: Lewis and Loftus // // Alternate solution to Programming Project 2.2 (5th Ed, p. 107) //******************************************************************** import java.util.Scanner; class AverageOfThree2 { //----------------------------------------------------------------- // Reads three integers from the user and prints their average. //----------------------------------------------------------------- public static void main (String[] args) { int num1, num2, num3; double average; Scanner scan = new Scanner (System.in); System.out.print ("Enter three numbers: "); num1 = scan.nextInt(); num2 = scan.nextInt(); num3 = scan.nextInt(); average = (double) (num1+num2+num3) / 3; System.out.println ("The average is: " + average); } } The Balloons Applet: Object 1 //******************************************************************** // Balloons.java Author: Lewis and Loftus // // Solution to Programming Project 2.15 (5th Ed, p. 108) //******************************************************************** import javax.swing.JApplet; import java.awt.*; public class Balloons extends JApplet { //----------------------------------------------------------------- // Draws a set of balloons on strings. //----------------------------------------------------------------- public void paint (Graphics page) { setBackground (Color.white); // draw the strings page.setColor (Color.black); page.drawLine (45, 95, 100, 300); page.drawLine (90, 100, 100, 300); page.drawLine (60, 100, 100, 300); page.drawLine (122, 85, 100, 300); page.drawLine (145, 115, 100, 300); // draw the balloons page.setColor (Color.blue); page.fillOval (20, 30, 50, 65); page.setColor (Color.yellow); page.fillOval (70, 40, 40, 60); page.setColor (Color.red); page.fillOval (40, 50, 40, 55); page.setColor (Color.green); page.fillOval (100, 30, 45, 55); page.setColor (Color.cyan); page.fillOval (120, 55, 50, 60); } } The BigDipper Applet: Object 1 //******************************************************************** // BigDipper.java Author: Lewis and Loftus // // Solution to Programming Project 2.14 (5th Ed, p. 108) //******************************************************************** import javax.swing.JApplet; import java.awt.*; public class BigDipper extends JApplet { //----------------------------------------------------------------- // Draws the Big Dipper constellation and some other stars. //----------------------------------------------------------------- public void paint (Graphics page) { setBackground (Color.black); page.setColor (Color.white); page.drawLine (100, 80, 110, 120); page.drawLine (110, 120, 165, 115); page.drawLine (165, 115, 175, 70); page.drawLine (100, 80, 175, 70); page.drawLine (175, 70, 245, 20); page.drawLine (245, 20, 280, 30); // Draw some extra stars page.fillOval (50, 50, 4, 4); page.fillOval (70, 150, 3, 3); page.fillOval (90, 30, 3, 3); page.fillOval (220, 140, 4, 4); page.fillOval (280, 170, 3, 3); page.fillOval (310, 100, 4, 4); page.fillOval (360, 20, 3, 3); } } The BusinessCard Applet: Object 1 //******************************************************************** // BusinessCard.java Author: Lewis and Loftus // // Solution to Programming Project 2.18 (5th Ed, p. 109) //******************************************************************** import javax.swing.JApplet; import java.awt.*; public class BusinessCard extends JApplet { //----------------------------------------------------------------- // Draws a business card. //----------------------------------------------------------------- public void paint (Graphics page) { setBackground (Color.yellow); page.setColor (Color.red); page.fillOval (10, 20, 60, 60); page.setColor (Color.cyan); page.fillRect (25, 35, 130, 25); page.setColor (Color.black); page.drawString ("James C. Kerplunk", 35, 50); page.drawString ("President and CEO", 85, 80); page.drawString ("Origin Software, Inc.", 85, 100); page.drawLine (225, 20, 225, 80); page.drawLine (195, 50, 255, 50); page.setColor (Color.blue); page.drawString ("where it all begins...", 115, 135); } } //******************************************************************** // ChangeCounter.java Author: Lewis and Loftus // // Solution to Programming Project 2.8 (5th Ed, p. 107) //******************************************************************** import java.util.Scanner; public class ChangeCounter { //----------------------------------------------------------------- // Computes the total value of a collection of coins. //----------------------------------------------------------------- public static void main (String[] args) { int quarters, dimes, nickels, pennies; int total, dollars, cents; Scanner scan = new Scanner(System.in); System.out.print ("Enter the number of quarters: "); quarters = scan.nextInt(); System.out.print ("Enter the number of dimes: "); dimes = scan.nextInt(); System.out.print ("Enter the number of nickels: "); nickels = scan.nextInt(); System.out.print ("Enter the number of pennies: "); pennies = scan.nextInt(); total = quarters * 25 + dimes * 10 + nickels * 5 + pennies; dollars = total / 100; cents = total % 100; System.out.println ("Total value: " + dollars + " dollars and " + cents + " cents."); } } The DrawName Applet Object 1 //******************************************************************** // DrawName.java Author: Lewis and Loftus // // Solution to Programming Project 2.13 (5th Ed, p. 108) //******************************************************************** import javax.swing.JApplet; import java.awt.*; public class DrawName extends JApplet { //----------------------------------------------------------------- // Draws a name. //----------------------------------------------------------------- public void paint (Graphics page) { setBackground (Color.cyan); page.setColor (Color.black); page.drawString ("John A. Lewis", 50, 50); } } //******************************************************************** // FloatCalculations.java Author: Lewis and Loftus // // Solution to Programming Project 2.3 (5th Ed, p. 107) //******************************************************************** import java.util.Scanner; class FloatCalculations { //----------------------------------------------------------------- // Reads two floating point numbers and prints their sum, // difference, and product. //----------------------------------------------------------------- public static void main (String[] args) { float num1, num2; Scanner scan = new Scanner (System.in); System.out.print ("Enter the first number: "); num1 = scan.nextFloat(); System.out.print ("Enter the second number: "); num2 = scan.nextFloat(); System.out.println ("Their sum is: " + (num1+num2)); System.out.println ("Their difference is: " + (num1-num2)); System.out.println ("Their product is: " + (num1*num2)); } } //******************************************************************** // Fraction.java Author: Lewis and Loftus // // Solution to Programming Project 2.11 (5th Ed, p. 108) //******************************************************************** import java.util.Scanner; public class Fraction { //----------------------------------------------------------------- // Computes the floating point equivalent of a fraction. //----------------------------------------------------------------- public static void main (String[] args) { int numerator, denominator; float value; Scanner scan = new Scanner(System.in); System.out.print ("Enter the numerator: "); numerator = scan.nextInt(); System.out.print ("Enter the denominator: "); denominator = scan.nextInt(); value = (float) numerator / denominator; System.out.println ("Floating point equivalent: " + value); } } The HousePicture Applet: Object 1 //******************************************************************** // HousePicture.java Author: Lewis and Loftus // // Solution to Programming Project 2.17 (5th Ed, p. 108) //******************************************************************** import javax.swing.JApplet; import java.awt.*; public class HousePicture extends JApplet { //----------------------------------------------------------------- // Draws a house scene. //----------------------------------------------------------------- public void paint (Graphics page) { setBackground (Color.cyan); page.setColor (Color.gray); page.fillRect (0, 200, 400, 50); // ground page.setColor (Color.blue); page.fillRect (50, 125, 300, 100); // house page.setColor (Color.green); page.fillRect (180, 175, 40, 50); // door page.setColor (Color.yellow); page.fillRect (100, 155, 40, 25); // window page.fillRect (260, 155, 40, 25); // window page.setColor (Color.black); page.fillRect (40, 100, 320, 40); // roof page.fillOval (210, 200, 6, 6); // doorknob page.setColor (Color.red); page.fillRect (80, 80, 20, 40); // chimney page.setColor (Color.darkGray); page.fillOval (80, 60, 20, 20); // smoke page.fillOval (85, 50, 15, 25); // smoke page.fillOval (90, 45, 15, 20); // smoke page.setColor (Color.white); page.fillOval (200, 30, 80, 40); // cloud page.fillOval (230, 40, 80, 40); // cloud } } //******************************************************************** // Lincoln4.java Author: Lewis and Loftus // // Solution to Programming Project 2.1 (5th Ed, page 107) //******************************************************************** class Lincoln4 { //----------------------------------------------------------------- // Prints a quote from Abraham Lincoln, including quotation // marks. //----------------------------------------------------------------- public static void main (String[] args) { System.out.println ("A quote by Abraham Lincoln:"); System.out.println ("\"Whatever you are, be a good one.\""); } } //******************************************************************** // MilesToKilometers.java Author: Lewis and Loftus // // Solution to Programming Project 2.5 (5th Ed, p. 107) //******************************************************************** import java.util.Scanner; public class MilesToKilometers { //----------------------------------------------------------------- // Converts miles into kilometers. The value for miles is read // from the user. //----------------------------------------------------------------- public static void main (String[] args) { final double MILES_PER_KILOMETER = 1.60935; double miles, kilometers; Scanner scan = new Scanner(System.in); System.out.print ("Enter the distance in miles: "); miles = scan.nextDouble(); kilometers = MILES_PER_KILOMETER * miles; System.out.println ("That distance in kilometers is: " + kilometers); } } //******************************************************************** // MoneyConversion.java Author: Lewis and Loftus // // Solution to Programming Project 2.9 (5th Ed, p. 107) //******************************************************************** import java.util.Scanner; public class MoneyConversion { //----------------------------------------------------------------- // Reads a monetary amount and computes the equivalent in bills // and coins. //----------------------------------------------------------------- public static void main (String[] args) { double total; int tens, fives, ones, quarters, dimes, nickels; int remainingCents; Scanner scan = new Scanner(System.in); System.out.print ("Enter monetary amount: "); total = scan.nextDouble(); remainingCents = (int) (total * 100); tens = remainingCents / 1000; remainingCents %= 1000; fives = remainingCents / 500; remainingCents %= 500; ones = remainingCents / 100; remainingCents %= 100; quarters = remainingCents / 25; remainingCents %= 25; dimes = remainingCents / 10; remainingCents %= 10; nickels = remainingCents / 5; remainingCents %= 5; System.out.println ("That's equivalent to:"); System.out.println (tens + " ten dollar bills"); System.out.println (fives + " five dollar bills"); System.out.println (ones + " one dollar bills"); System.out.println (quarters + " quarters"); System.out.println (dimes + " dimes"); System.out.println (nickels + " nickels"); System.out.println (remainingCents + " pennies"); } } The OlympicRings Applet: Object 1 //******************************************************************** // OlympicRings.java Author: Lewis and Loftus // // Solution to Programming Project 2.16 (5th Ed, p. 108) //******************************************************************** import javax.swing.JApplet; import java.awt.*; public class OlympicRings extends JApplet { //----------------------------------------------------------------- // Draws the olympic logo. //----------------------------------------------------------------- public void paint (Graphics page) { final int DIAMETER = 50; setBackground (Color.lightGray); page.setColor (Color.blue); page.drawOval (30, 40, DIAMETER, DIAMETER); page.setColor (Color.yellow); page.drawOval (60, 70, DIAMETER, DIAMETER); page.setColor (Color.black); page.drawOval (90, 40, DIAMETER, DIAMETER); page.setColor (Color.green); page.drawOval (120, 70, DIAMETER, DIAMETER); page.setColor (Color.red); page.drawOval (150, 40, DIAMETER, DIAMETER); } } The PieChart Applet: Object 1 //******************************************************************** // PieChart.java Author: Lewis and Loftus // // Solution to Programming Project 2.20 (5th Ed, p. 109) //******************************************************************** import javax.swing.JApplet; import java.awt.*; public class PieChart extends JApplet { //----------------------------------------------------------------- // Draws the pie chart with equal sections. //----------------------------------------------------------------- public void paint (Graphics page) { setBackground (Color.lightGray); page.setColor (Color.blue); page.fillArc (70, 25, 100, 100, 0, 45); page.setColor (Color.yellow); page.fillArc (70, 25, 100, 100, 45, 45); page.setColor (Color.black); page.fillArc (70, 25, 100, 100, 90, 45); page.setColor (Color.green); page.fillArc (70, 25, 100, 100, 135, 45); page.setColor (Color.red); page.fillArc (70, 25, 100, 100, 180, 45); page.setColor (Color.magenta); page.fillArc (70, 25, 100, 100, 225, 45); page.setColor (Color.cyan); page.fillArc (70, 25, 100, 100, 270, 45); page.setColor (Color.orange); page.fillArc (70, 25, 100, 100, 315, 45); } } This folder contains solutions to the Programming Projects from Chapter 2 of Java Software Solutions, 5th Ed, by Lewis and Loftus. Project File(s) ------- ------- 2.1 Lincoln4.java 2.2 AverageOfThree.java AverageOfThree2.java (alternative solution) 2.3 FloatCalculations.java 2.4 TempConverter2.java 2.5 MilesToKilometers.java 2.6 Seconds.java 2.7 Seconds2.java 2.8 ChangeCounter.java 2.9 MoneyConversion.java 2.10 SquareCalculations.java 2.11 Fraction.java 2.12 Snowman2.java Snowman2.html 2.13 DrawName.java DrawName.html 2.14 BigDipper.java BigDipper.html 2.15 Balloons.java Balloons.html 2.16 OlympicRings.java OlympicRings.html 2.17 HousePicture.java HousePicture.html 2.18 BusinessCard.java BusinessCard.html 2.19 ShadowName.java ShadowName.html 2.20 PieChart.java PieChart.html //******************************************************************** // Seconds.java Author: Lewis and Loftus // // Solution to Programming Project 2.6 (5th Ed, p. 107) //******************************************************************** import java.util.Scanner; public class Seconds { //----------------------------------------------------------------- // Computes the total number of seconds for a given number of // hours, minutes, and seconds. //----------------------------------------------------------------- public static void main (String[] args) { final int SECONDS_PER_HOUR = 3600; final int SECONDS_PER_MINUTE = 60; int seconds, minutes, hours, totalSeconds; Scanner scan = new Scanner(System.in); System.out.print ("Enter the number of hours: "); hours = scan.nextInt(); System.out.print ("Enter the number of minutes: "); minutes = scan.nextInt(); System.out.print ("Enter the number of seconds: "); seconds = scan.nextInt(); totalSeconds = hours * SECONDS_PER_HOUR + minutes * SECONDS_PER_MINUTE + seconds; System.out.println (); System.out.println ("Total seconds: " + totalSeconds); } } //******************************************************************** // Seconds2.java Author: Lewis and Loftus // // Solution to Programming Project 2.7 (5th Ed, p. 107) //******************************************************************** import java.util.Scanner; public class Seconds2 { //----------------------------------------------------------------- // Computes the number of hours, minutes, and seconds that are // equivalent to the number of seconds entered by the user. //----------------------------------------------------------------- public static void main (String[] args) { final int SECONDS_PER_HOUR = 3600; final int SECONDS_PER_MINUTE = 60; int seconds, minutes, hours; Scanner scan = new Scanner(System.in); System.out.print ("Enter the number of seconds: "); seconds = scan.nextInt(); hours = seconds / SECONDS_PER_HOUR; seconds = seconds % SECONDS_PER_HOUR; // still remaining minutes = seconds / SECONDS_PER_MINUTE; seconds = seconds % SECONDS_PER_MINUTE; // still remaining System.out.println (); System.out.println ("Hours: " + hours); System.out.println ("Minutes: " + minutes); System.out.println ("Seconds: " + seconds); } } The ShadowName Applet Object 1 //******************************************************************** // ShadowName.java Author: Lewis and Loftus // // Solution to Programming Project 2.19 (5th Ed, p. 109) //******************************************************************** import javax.swing.JApplet; import java.awt.*; public class ShadowName extends JApplet { //----------------------------------------------------------------- // Draws a name with a slightly offset shadow. //----------------------------------------------------------------- public void paint (Graphics page) { setBackground (Color.yellow); page.setColor (Color.black); page.drawString ("John A. Lewis", 50, 50); page.setColor (Color.red); page.drawString ("John A. Lewis", 49, 49); } } The Snowman2 Applet Object 1 //******************************************************************** // Snowman2.java Author: Lewis and Loftus // // Solution to Programming Project 2.12 (5th Ed, p. 108) //******************************************************************** import javax.swing.JApplet; import java.awt.*; public class Snowman2 extends JApplet { //----------------------------------------------------------------- // Draws a snowman with added features. //----------------------------------------------------------------- public void paint (Graphics page) { final int MID = 130; final int TOP = 50; setBackground (Color.cyan); page.setColor (Color.blue); page.fillRect (0, 175, 300, 50); // ground page.setColor (Color.yellow); page.fillOval (260, -40, 80, 80); // sun page.setColor (Color.white); page.fillOval (MID-20, TOP, 40, 40); // head page.fillOval (MID-35, TOP+35, 70, 50); // upper torso page.fillOval (MID-50, TOP+80, 100, 60); // lower torso page.setColor (Color.red); page.fillOval (MID-3, TOP+50, 6, 6); // button page.fillOval (MID-3, TOP+60, 6, 6); // button page.setColor (Color.black); page.fillOval (MID-10, TOP+10, 5, 5); // left eye page.fillOval (MID+5, TOP+10, 5, 5); // right eye page.drawArc (MID-10, TOP+20, 20, 10, 10, 160); // frown page.drawLine (MID-25, TOP+60, MID-50, TOP+40); // left arm page.drawLine (MID+25, TOP+60, MID+55, TOP+60); // right arm page.drawLine (MID-20, TOP+5, MID+20, TOP+5); // brim of hat page.fillRect (MID-15, TOP-20, 30, 25); // top of hat page.drawString ("John Lewis", 20, 20); // artist } } //******************************************************************** // SquareCalculations.java Author: Lewis and Loftus // // Solution to Programming Project 2.10 (5th Ed, p. 108) //******************************************************************** import java.util.Scanner; public class SquareCalculations { //----------------------------------------------------------------- // Computes a squares perimeter and area given the length of // one side. //----------------------------------------------------------------- public static void main (String[] args) { int side, perimeter, area; Scanner scan = new Scanner(System.in); System.out.print ("Enter the length of a square