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Chapter: 4 -Problem: 21 >> Write an if statement that tests to see whether a String begins with a capital letter.
Answer Preview: Statement that tests t…

, Chapter: 11 -Problem: 2 >> Write a program that solves the classic “stable marriage” problem. This problem deals with a group of men and a group of women. The program tries to pair them up so as to generate as many stable marriages as possible. A set of marriages is unstable if you can find a man and a woman who would rather be married to each other than to their current spouses (in which case the two would be inclined to d
Answer Preview: public class Person public static final int NOBODY 1 private String name private List preferences private List oldPreferences private int partner public PersonString name thisname name preferences new …

, Chapter: 15 -Problem: 15 >> What is the benefit of adding an iterator to the list class?
Answer Preview: An iterator pro…

, Chapter: 10 -Problem: 11 >> Given the ArrayList from problem 4, write a for-each loop that prints the uppercase version of each String in the list on its own line. Data from Problem 4Write code to insert two additional elements, " dark " and " and ", at the proper places in the list to produce the following ArrayList as the result:["It", "was", "a", "dark", "and", "stormy", "night"]
Answer Preview: A for each loop that prints …

, Chapter: 3 -Problem: 4 >> Write a program that prompts for the lengths of the sides of a triangle and reports the three angles.
Answer Preview: public class TriangleAngles public static void main String args giveIntro Scanner console new S…

, Chapter: 5 -Problem: 25 >> Write a method called charsSorted that accepts a string as its parameter and returns true if the characters in the string appear in sorted alphabetical order. For example, the calls of charsSorted("abcde") and charsSorted("bins") should return true, but the call of charsSorted("beads") should return false.
Answer Preview: public static boole…

, Chapter: 2 -Problem: 9 >> Suppose you have an int variable called number . What Java expression produces the last digit of the number (the 1s place)?
Answer Preview: Last…

, Chapter: 11 -Problem: 12 >> Write a method contains3 that accepts a list of strings as a parameter and returns true if any single string occurs at least 3 times in the list, and false otherwise. Use a map as auxiliary storage.
Answer Preview: public static boolean contains3 List list Map c…

, Chapter: 15 -Problem: 8 >> Write a method called count that accepts an element value as a parameter and returns the number of occurrences of that value in the list. For example, suppose a variable named list stores [2, -3, 2, 0, 5, 2, 2, 6]. A call of list.count(2) should return 4 because there are four occurrences of that value in the list.
Answer Preview: public int count int …

, Chapter: 10 -Problem: 20 >> Modify the TimeSpan class from Chapter 8 to include a compareTo method that compares time spans by their length. A time span that represents a shorter amount of time is considered to be “less than” one that represents a longer amount of time. For example, a span of 3 hours and 15 minutes is greater than a span of 1 hour and 40 minutes.
Answer Preview: first implementation hours and minutes fields public class TimeSpan implements Comparabl…

, Chapter: 4 -Problem: 3 >> Write a method called season that takes as parameters two integers representing a month and day and returns a String indicating the season for that month and day. Assume that the month is specified as an integer between 1 and 12 (1 for January, 2 for February, and so on) and that the day of the month is a number between 1 and 31. If the date falls between 12/16 and 3/15, the method should return "
Answer Preview: public static String season int month int day 3 day 16 if month 3 month return Winter else if mo…

, Chapter: 5 -Problem: 29 >> Identify the various assertions in the following code as being always true, never true, or sometimes true and sometimes false at various points in program execution. The comments indicate the points of interest:Categorize each assertion at each point with ALWAYS, NEVER, or SOMETIMES. Transcribed Image Text:
Answer Preview: xy z0 Y20 Point A Sometimes true Sometimes …

, Chapter: 2 -Problem: 24 >> Write a program called TwoRectangles that uses two integer class constants called WIDTH and HEIGHT to draw two rectangles of stars of the given dimensions. The first rectangle should be flush left, and the second should be indented horizontally by the given width. For example, if the WIDTH and HEIGHT are 7 and 4 respectively, the program should draw the following figure:
Answer Preview: public class TwoRectangles public static f…

, Chapter: 11 -Problem: 18 >> Write a method called reverse that accepts a map from strings to strings as a parameter and returns a new map that is the reverse of the original. The reverse of a map is a new map that uses the values from the original as its keys and the keys from the original as its values. Since a map’s values need not be unique but its keys must be, you should have each value map to a set of keys. In other wo
Answer Preview: public static Map reverse Map …

, Chapter: 7 -Problem: 8 >> Which of the following is the correct syntax to declare an array of the given six integer values?a. int[] a = {17, -3, 42, 5, 9, 28};b. int a {17, -3, 42, 5, 9, 28};c. int[] a = new int[6] {17, -3, 42, 5, 9, 28};d. int[6] a = {17, -3, 42, 5, 9, 28};e. int[] a = int [17, -3, 42, 5, 9, 28] {6};
Answer Preview: Correct syntax t…

, Chapter: 15 -Problem: 6 >> Write a method called fill that accepts an integer value as a parameter and replaces every value in the list with that value. For example, if a variable called list initially stores [42, –7, 3, 0, 15] and the call of list.fill(2); is made, the list will be changed to store [2, 2, 2, 2, 2].
Answer Preview: public void fi…

, Chapter: 12 -Problem: 10 >> What would be the effect if the code for the reverse method were changed to the following? Transcribed Image Text: public static void reverse (Scanner input) { if (input.hasNextLine () ) { // recursive case (nonempty file) reverse (input); // moved this line String line = input.nextLine () ; System.
Answer Preview: The new code shown would cause …

, Chapter: 4 -Problem: 16 >> Write a method called printPalindrome that accepts a Scanner for the console as a parameter, prompts the user to enter one or more words, and prints whether the entered String is a palindrome (i.e., reads the same forward as it does backward, like "abba" or "racecar ") . For an added challenge, make the code case-insensitive, so that words like “Abba” and “Madam” will be considered palindromes.
Answer Preview: public static void print Palindrome Scanner console System out print Type on…

, Chapter: 2 -Problem: 15 >> Rewrite the code from the previous exercise to be shorter, by declaring the variables together and by using the special assignment operators (e.g., += , ?= , *= , and /= ) as appropriate. Data from Previous Problemint first = 8;int second = 19;first = first + second;second = first ? second;first = first ? second;
Answer Preview: Rewritten shortened ve…

, Chapter: 2 -Problem: 15 >> Write a method called printDesign that produces the following output. Use nested for loops to capture the structure of the figure. Transcribed Image Text: -----1 ----333-- ---55555--- --7777777-- -999999999-
Answer Preview: public stat…

, Chapter: 13 -Problem: 22 >> Consider the following sorted array of integers. When a binary search is performed on this array for each of the following integer values, what indexes are examined in order? What result value is returned?a. –5b. 0c. 11d. –100 Transcribed Image Text: // index 1 2 3 4 5 6 7 8 10 11 12 13 int [] numbe
Answer Preview: The binary search algorithm will examine the f…

, Chapter: 7 -Problem: 2 >> Write a method called range that returns the range of values in an array of integers. The range is defined as 1 more than the difference between the maximum and minimum values in the array. For example, if an array called list contains the values [ 36, 12, 25, 19, 46, 31, 22 ] , the call of range(list) should return 35 (46 - 12 + 1). You may assume that the array has at least one element.
Answer Preview: public static int range int a int min 0 int max 0 for int i 0 i alength i if i 0 ai …

, Chapter: 15 -Problem: 13 >> Write a method removeAll that accepts an integer value as a parameter and that removes all occurrences of the given value from the list.
Answer Preview: public void removeAll int value int i 0 while i size m if elementData i …

, Chapter: 11 -Problem: 21 >> Write a method called pairCounts that accepts a list of strings representing individual words and counts the number of occurrences of all 2-character sequences of letters in those words. For example, suppose the list contains ["banana", "bends", "i", "mend", "sandy"]. This list contains the following two-character pairs: "ba", "an", "na", "an", "na" from "banana"; "be", "en", "nd", "ds" from "bend
Answer Preview: public static Map pairCounts List list Map m…

, Chapter: 3 -Problem: 19 >> Assuming that the following variables have been declared:evaluate the following expressions:a. str1.length()b. str1.charAt(7)c. str2.charAt(0)d. str1.indexOf("o")e. str2.toUpperCase()f. str1.toLowerCase().indexOf("B")g. str1.substring(4)h. str2.substring(3, 14)i. str2.replace("a", "oo")j. str2.replace("gray", "white")k. "str1".replace("r", "range")
Answer Preview: Results of String expressions …

, Chapter: 2 -Problem: 1 >> In physics, a common useful equation for finding the position of a body in linear motion at a given time , based on its initial position, initial velocity , and rate of acceleration , is the following:Write code to declare variables for , , , and , and then write the code to compute on the basis of these values. Transcribe
Answer Preview: double s0 120 double …

, Chapter: 11 -Problem: 17 >> A Map doesn’t have the get and set methods that an ArrayList has. It doesn’t even have an iterator method like a Set does, nor can you use a for-each loop on it directly. How do you examine every key (or every value) of a Map?
Answer Preview: You can examine every key of a Map by calling the keySet metho…

, Chapter: 3 -Problem: 1 >> Which of the following is the correct syntax to draw a rectangle?a. Graphics g.drawRect(10, 20, 50, 30);b. G.drawRect(10, 20, 50, 30);c. G.draw.rectangle(10, 20, 50, 30);d. Graphics.drawRect(10, 20, 50, 30);e. G.drawRect(x = 10, y = 20, width = 50, height = 30);
Answer Preview: b Gd…

, Chapter: 16 -Problem: 1 >> Write a method called set that accepts an index and a value and sets the list’s element at that index to have the given value. You may assume that the index is between 0 (inclusive) and the size of the list (exclusive).
Answer Preview: public void set int inde…

, Chapter: 12 -Problem: 26 >> Figure 12.12 shows only part of the decision tree for the first two levels. How many entries are there at the second level of the full tree? How many are at level 3 of the full tree? Transcribed Image Text: empty col l row 2 col I col | col l col l col l col l col I row | row 3 row 4 row 5 row 6 row
Answer Preview: There are 64 entries at …

, Chapter: 3 -Problem: 20 >> Write a method called inputBirthday that accepts a Scanner for the console as a parameter and prompts the user to enter a month, day, and year of birth, then prints the birthdate in a suitable format. Here is an example dialogue with the user:On what day of the month were you born? 8What is the name of the month in which you were born? MayDuring what year were you born? 1981You were born on May 8,
Answer Preview: public static void inputBirthday Scanner input System out print On what d…

, Chapter: 1 -Problem: 6 >> Write a program that produces as output the words of the song, “Bought Me a Cat.” Use methods for each verse and for repeated text.
Answer Preview: This program tests your understanding of using static methods and println statements You should write a Java class called Song that should be saved into a file called Songjava Your program should prod…

, Chapter: 11 -Problem: 8 >> What is an abstract data type (ADT)? What ADT does a linked list implement?
Answer Preview: An abstract data type defines the …

, Chapter: 7 -Problem: 4 >> Write a method called isSorted that accepts an array of real numbers as a parameter and returns true if the list is in sorted (nondecreasing) order and false otherwise. For example, if arrays named list1 and list2 store [16.1, 12.3, 22.2, 14.4] and [1.5, 4.3, 7.0, 19.5, 25.1, 46.2] respectively, the calls isSorted(list1) and isSorted(list2) should return false and true respectively. Assume the arr
Answer Preview: public static boolean is …

, Chapter: 15 -Problem: 6 >> We wrote the class to have public methods called size (to read the number of elements of the list) and get (to access the element value at a specific index). Why is this approach better than declaring the fields (such as size ) public?
Answer Preview: Having accessor methods such as size is better than makin…

, Chapter: 12 -Problem: 28 >> The 8 Queens explore method stops once it finds one solution to the problem. What part of the code causes the algorithm to stop once it finds a solution? How could the code be modified so that it would find and output every solution to the problem?
Answer Preview: The 8 Queens explore method stops once it finds one solution to the proble…

, Chapter: 4 -Problem: 10 >> Write a method called printGPA that accepts a Scanner for the console as a parameter and calculates a student’s grade point average. The user will type a line of input containing the student’s name, then a number that represents the number of scores, followed by that many integer scores. Here are two example dialogues:Enter a student record: Maria 5 72 91 84 89 78Maria's grade is 82.8Enter a stude
Answer Preview: public static void print GPA System …

, Chapter: 2 -Problem: 13 >> What are the values of a , b , and c after the following statements?int a = 5;int b = 10;int c = b; a = a + 1;b = b - 1;c = c + a;
Answer Preview: Values of …

, Chapter: 2 -Problem: 9 >> Write nested for loops to produce the following output, with each line 40 characters wide: Transcribed Image Text: 1122334455667788990011223344556677889900
Answer Preview: int c…

, Chapter: 13 -Problem: 26 >> How many calls on the mergeSort method are generated by a call to sort a list of length 32?
Answer Preview: A merge sort of 32 elem…

, Chapter: 4 -Problem: 1 >> Translate each of the following English statements into logical tests that could be used in an if/else statement. Write the appropriate if statement with your logical test. Assume that three int variables, x, y , and z , have been declared.a. z is odd.b. z is not greater than y’ s square root.c. y is positive.d. Either x or y is even, and the other is odd.e. y is a multiple of z .f. z is not zero.
Answer Preview: English statements translated into l…

, Chapter: 15 -Problem: 19 >> Write a method called sum that returns the sum of all values in the list. For example, if a variable called list stores [11, –7, 3, 42, 0, 14], the call of list.sum() should return 63. If the list is empty, sum should return 0.
Answer Preview: public int sum t…

, Chapter: 12 -Problem: 17 >> The following method has a bug that leads to infinite recursion. What correction fixes the code? Transcribed Image Text: // Adds the digits of the given number. // Example: digitsum (3456) returns 3+4+5+6 = 18 public static int digitSum (int n) { if (n > 10) { // base case (small number) return n; }
Answer Preview: The base case if statement …

, Chapter: 3 -Problem: 11 >> Modify your previous Stairs program to draw each of the outputs shown in Figure 3G.32. Modify only the body of your loop. (You may want to make a new table to find the expressions for x,  y width, and height for each new output.) Transcribed Image Text: Dr... File View Help
Answer Preview: public class Stairs2 public static void main String arg…

, Chapter: 16 -Problem: 15 >> You’ll see pictures of linked nodes before and after changes. Write the code that will produce the given result by modifying links between the nodes shown and/or creating new nodes as needed. There may be more than one way to write the code, but you may not change any existing node’s data field value. If a variable does not appear in the “after” picture, it doesn’t matter what value it has after t
Answer Preview: list next next …

, Chapter: 1 -Problem: 10 >> What is the output produced from the following statements?System.out.println("Shaq is 7'1");System.out.println("The string "" is an empty message.");System.out.println("\'""");
Answer Preview: Output of st…

, Chapter: 13 -Problem: 19 >> Write a modified “dual” version of the selection sort algorithm that selects both the largest and smallest elements on each pass and moves each of them to the appropriate end of the array. Will this algorithm be faster than the standard selection sort? What predictions would you make about its performance relative to the merge sort algorithm? What will its complexity class (big-Oh) be?
Answer Preview: Places the elements of the given array into sorted order using th…

, Chapter: 7 -Problem: 5 >> What elements does the array numbers contain after the following code is executed?int[] numbers = new int[8];numbers[1] = 4;numbers[4] = 99;numbers[7] = 2;int x = numbers[1];numbers[x] = 44;numbers[numbers[7]] = 11; // uses numbers[7] as index
Answer Preview: After the code is ex…

, Chapter: 15 -Problem: 17 >> How does the array list iterator know if there are more elements left to examine? What does it do if the client tries to examine a next element but there are none left to examine?
Answer Preview: The iterator knows there are more el…

, Chapter: 10 -Problem: 22 >> Use the compareTo method to write code that reads two names from the console and prints the one that comes first in alphabetical order. For example, the program’s output might look like the following:Type a name: Tyler DurdenType a name: Marla SingerMarla Singer goes before Tyler Durden
Answer Preview: Code that reads two names from the console and prints the one that comes first in alphabetical …

, Chapter: 4 -Problem: 16 >> What is wrong with the following code, which attempts to return the number of factors of a given integer n? Describe how to fix the code. Transcribed Image Text: public static int countFactors (int n) { for (int i = 1; i <= n; i++) { if (n i = 0) { // factor return i; olo
Answer Preview: The countFactors method shown will not compile It should count the fact…

, Chapter: 18 -Problem: 8 >> Write a method called descending that accepts an array of integers and rearranges the integers in the array to be in descending order using a PriorityQueue as a helper. For example, if the array passed stores [42, 9, 22, 17, -3, 81], after the call the array should store [81, 42, 22, 17, 9, -3].
Answer Preview: public static void descending (int[] a) …

, Chapter: 2 -Problem: 4 >> Trace the evaluation of the following expressions, and give their resulting values:a. 4.0 / 2 * 9 / 2b. 2.5 * 2 + 8 / 5.0 + 10 / 3c. 12 / 7 * 4.4 * 2 / 4d. 4 * 3 / 8 + 2.5 * 2e. (5 * 7.0 / 2 ? 2.5) / 5 * 2f. 41 % 7 * 3 / 5 + 5 / 2 * 2.5g. 10.0 / 2 / 4h. 8 / 5 + 13 / 2 / 3.0i. (2.5 + 3.5) / 2j. 9 / 4 * 2.0 ? 5 / 4k. 9 / 2.0 + 7 / 3 ? 3.0 / 2l. 813 % 100 / 3 + 2.4m. 27 / 2 / 2.0 * (4.3 + 1.7) ? 8 /
Answer Preview: a 90 b 96 c 22 d …

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, Chapter: 3 -Problem: 3 >> Write a program that draws checkerboards like these shown in Figure 3G.37 onto a DrawingPanel of size 420 × 300. Transcribed Image Text: Drawing Panel
Answer Preview: public class Checkerboard public static void mainString args DrawingPanel p …

, Chapter: 14 -Problem: 21 >> The following piece of code incorrectly attempts to remove all even values from a stack of integers. What is wrong with the code, and how would you fix it? Transcribed Image Text: while (!s.isEmpty ()) { int n = s.pop (); if (n % 2 != 0) { s.push (n); // put back in stack if odd
Answer Preview: The problem with the code is that it puts the odd elements back at the top of the …

, Chapter: 4 -Problem: 11 >> Write a method called longestName that accepts a Scanner for the console and an integer as parameters and prompts for names, then prints the longest name (the name that contains the most characters) in the format shown below, which might result from a call of longestName(console, 4):name #1? Royname #2? DANEname #3? sTeFaNiEname #4? MarianaStefanie's name is longest
Answer Preview: public static void longest Name Sc…

, Chapter: 19 -Problem: 12 >> Write a piece of code that uses stream operations to count the number of even integers in a stream. For example, if the stream contains {18, 1, 6, 8, 9, 2}, there are 4 even integers.
Answer Preview: int evens (in…

, Chapter: 2 -Problem: 4 >> Write nested for loops to produce the following output:***** ***** ***** *****
Answer Preview: fo…

, Chapter: 13 -Problem: 20 >> What indexes will be examined as the middle element by a binary search for the target value 8 when the search is run on the following input array? Notice that the input array isn’t in sorted order. What can you say about the binary search algorithm’s result?int[] numbers = {6, 5, 8, 19, 7, 35, 22, 11, 9};
Answer Preview: The algorithm will examine …

, Chapter: 7 -Problem: 5 >> Write a method called mode that returns the most frequently occurring element of an array of integers. Assume that the array has at least one element and that every element in the array has a value between 0 and 100 inclusive. Break ties by choosing the lower value. For example, if the array passed contains the values [ 27, 15, 15, 11, 27 ], your method should return 15.
Answer Preview: public static int mode int a tally …

, Chapter: 15 -Problem: 18 >> What is a precondition of the iterator’s remove method? How does the iterator enforce this precondition, and what does it do if the precondition is violated?
Answer Preview: The precondition of remove is that the method next has been c…

, Chapter: 3 -Problem: 13 >> Evaluate the following expressions:a. Math.abs(–1.6)b. Math.abs(2 + –4)c. Math.pow(6, 2)d. Math.pow(5 / 2, 6)e. Math.ceil(9.1)f. Math.ceil(115.8)g. Math.max(7, 4)h. Math.min(8, 3 + 2)i. Math.min(–2, –5)j. Math.sqrt(64)k. Math.sqrt(76 + 45)l. 100 + Math.log10(100)m. 13 + Math.abs(–7) – Math.pow(2, 3) + 5n. Math.sqrt(16) * Math.max(Math.abs(–5), Math.abs(–3))o. 7 – 2 + Math.log10(1000) + Math.log(Ma
Answer Preview: Results of Math expressio…

, Chapter: 16 -Problem: 19 >> Write a method called rotate that moves the value at the front of a list of integers to the end of the list. For example, if a variable called list stores the values [8, 23, 19, 7, 45, 98, 102, 4], then the call of list.rotate(); should move the value 8 from the front of the list to the back of the list, changing the list to store [23, 19, 7, 45, 98, 102, 4, 8] . If the method is called for a list
Answer Preview: public void rotate () { if (front != null && f…

, Chapter: 1 -Problem: 29 >> The following program contains at least 10 syntax errors. What are they? Transcribed Image Text: public class Lotsof Errors { public static main (String args) { System.println (Hello, world!); message () public static void message { System.out println ("This program surely cannot System.out.println
Answer Preview: Mistakes in LotsOfErrors program 1 line 1 The class name …

, Chapter: 13 -Problem: 4 >> Write a program that discovers all anagrams of all words listed in an input file that stores the entries in a large dictionary. An anagram of a word is a rearrangement of its letters into a new legal word. For example, the anagrams of “share” include “shear”, “hears”, and “hares”. Assume that you have a file available to you that lists many words, one per line. Your program should first read in th
Answer Preview: import javaioBufferedReader import javaioFileNotFoundException import javaioFileReader import javaio…

, Chapter: 7 -Problem: 36 >> Write a piece of code that constructs a jagged two-dimensional array of integers with five rows and an increasing number of columns in each row, such that the first row has one column, the second row has two, the third has three, and so on. The array elements should have increasing values in top-to-bottom, left-to-right order (also called rowmajor order). In other words, the array’s contents shoul
Answer Preview: int jagged new int 5 int …

, Chapter: 14 -Problem: 11 >> Stacks and queues do not have index-based methods such as get from ArrayList. How can you access elements in the middle of a stack or queue?
Answer Preview: To access elements in the middle of a stack or queue …

, Chapter: 3 -Problem: 22 >> Write a program that outputs “The Name Game,” where the user inputs a first and last name and a song is printed about their first, then last, name. Use a method to avoid redundancy.
Answer Preview: import java util public class Name Game public static vo…

, Chapter: 19 -Problem: 6 >> Write a method pigLatin that uses stream operations to convert a String parameter into its “Pig Latin” form. For this problem we’ll use a simple definition of Pig Latin where the first letter should be moved to the end of the word and followed by “ay.” For example, if the string passed is "go seattle mariners", return "o-gay eattle-say ariners-may".
Answer Preview: // returns the given phrase's words in pig latin, such as // …

, Chapter: 4 -Problem: 20 >> Write a method called numUnique that takes three integers as parameters and returns the number of unique integers among the three. For example, the call numUnique(18, 3, 4) should return 3 because the parameters have three different values. By contrast, the call numUnique(6, 7, 6) should return 2 because there are only two unique numbers among the three parameters: 6 and 7.
Answer Preview: public static int numUniq…

, Chapter: 9 -Problem: 5 >> For the next four problems, consider the task of representing types of tickets to campus events. Each ticket has a unique number and a price. There are three types of tickets: walk-up tickets, advance tickets, and student advance tickets. Figure 9.10 illustrates the types:Walk-up tickets are purchased the day of the event and cost $50.Advance tickets purchased 10 or more days before the event cost
Answer Preview: Superclass for all types of tickets public abstr…

, Chapter: 7 -Problem: 13 >> Write a method called longestSortedSequence that accepts an array of integers as a parameter and returns the length of the longest sorted (nondecreasing) sequence of integers in the array. For example, in the array [ 3, 8, 10, 1, 9, 14, –3, 0, 14, 207, 56, 98, 12 ], the longest sorted sequence in the array has four values in it (the sequence -3 0, 14, 207), so your method would return 4 if passed
Answer Preview: public static int longest SortedSequen…

, Chapter: 14 -Problem: 17 >> Write a method called compressDuplicates that accepts a stack of integers as a parameter and that replaces each sequence of duplicates with a pair of values: a count of the number of duplicates, followed by the actual duplicated number. For example, if the stack stores [2, 2, 2, 2, 2, ?4, ?4, ?4, 82, 6, 6, 6, 6, 17, 17] , your method should change it to store [5, 2, 3, ?4, 1, 82, 4, 6, 2, 17] . Th
Answer Preview: public void compress Duplicates Stack s Queue q new LinkedList while s isEmpty …

, Chapter: 4 -Problem: 4 >> Write a method called daysInMonth that takes a month (an integer between 1 and 12) as a parameter and returns the number of days in that month in this year. For example, the call daysInMonth(9) would return 30 because September has 30 days. Assume that the code is not being run during a leap year (that February always has 28 days). The following table lists the number of days in each month:
Answer Preview: public static int daysInMonth int month if month …

, Chapter: 1 -Problem: 17 >> Write a program called FarewellGoodBye that prints the following lyrics. Use static methods to show structure and eliminate redundancy in your solution. Transcribed Image Text: Farewell, goodbye, au revoir, good night! It's time, to go, and I'll be out of sight! Farewell, goodbye, au revoir, take ca
Answer Preview: public class SoLongFarewell public static void mainString args publi…

, Chapter: 13 -Problem: 18 >> Write a modified version of the selection sort algorithm that selects the largest element each time and moves it to the end of the array, rather than selecting the smallest element and moving it to the beginning. Will this algorithm be faster than the standard selection sort? What will its complexity class (big-Oh) be?
Answer Preview: Places the elements of the given array into sorted order using the selection …

, Chapter: 7 -Problem: 10 >> Write a piece of code that examines an array of integers and reports the maximum value in the array. Consider putting your code into a method called max that accepts the array as a parameter and returns the maximum value. Assume that the array contains at least one element.
Answer Preview: public static int max i…

, Chapter: 15 -Problem: 9 >> Describe the overall preconditions placed on the list class in this section. What assumptions do we make about how clients will use the list?
Answer Preview: The preconditions are that the client …

, Chapter: 3 -Problem: 12 >> Write a program called Triangle that uses the DrawingPanel to draw the figure shown in Figure 3G.33.The window is 600 × 200 pixels in size. The background is yellow and the lines are blue. The lines are 10 pixels apart vertically, and the diagonal lines intersect at the bottom of the figure in its horizontal center. Transc
Answer Preview: public class Triangle public static void main S…

, Chapter: 16 -Problem: 24 >> You’ll see pictures of long chains of linked nodes before and after changes. (The . . . in the middle of the chain signifies an indeterminate large number of nodes.) Write the code that will produce the given result by modifying links between the nodes shown and/or creating new nodes as needed. You will need to write loops to advance to the end of the list in order to reach the node(s) to modify.
Answer Preview: ListNode current = list…

, Chapter: 1 -Problem: 18 >> Name the three errors in the following program: Transcribed Image Text: public MyProgram { public static void main (String [] args) { System.out.println("This is a test of the") System.out.Println ("emergency broadcast system.");
Answer Preview: Mistakes in MyProgram program …

, Chapter: 11 -Problem: 6 >> Write a method called removeAll that accepts a linked list of integers as a parameter and removes all occurrences of a particular value. You must preserve the original relative order of the remaining elements of the list. For example, the call removeAll(list, 3) would change the list [3, 9, 4, 2, 3, 8, 17, 4, 3, 18, 2, 3] to [9, 4, 2, 8, 17, 4, 18, 2].
Answer Preview: public static void removeA…

, Chapter: 7 -Problem: 23 >> Write a method transpose that accepts a DrawingPanel as a parameter and inverts the image about both the and axes. You may assume that the image is square, that is, that its width and height are equal. Transcribed Image Text: Drawing Panel Drawing Panel Eile View Help Eile View Help ?
Answer Preview: public static void transpose Drawing Panel panel int pixels …

, Chapter: 14 -Problem: 6 >> Write a method called rearrange that accepts a queue of integers as a parameter and rearranges the order of the values so that all of the even values appear before the odd values and that otherwise preserves the original order of the queue. For example, if the queue stores [3, 5, 4, 17, 6, 83, 1, 84, 16, 37] , your method should rearrange it to store [4, 6, 84, 16, 3, 5, 17, 83, 1, 37] . Notice th
Answer Preview: public void rearrange Queue q Stack s new Stack int oldSize q …

, Chapter: 12 -Problem: 20 >> What is a fractal image? How does recursive programming help to draw fractals?
Answer Preview: A fractal is an image that is recursively c…

, Chapter: 3 -Problem: 10 >> Write a method called area that accepts as a parameter the radius of a circle and that returns the area of the circle. For example, the call area(2.0) should return 12.566370614359172. Recall that area can be computed as pi (?) times the radius squared and that Java has a constant called Math.PI.
Answer Preview: public static doub…

, Chapter: 18 -Problem: 11 >> Write a method called removeDuplicates that accepts a PriorityQueue of integers as a parameter and modifies the queue’s state so that any element that is equal to another element in the queue is removed. For example, if the queue stores [7, 7, 8, 8, 8, 10, 45, 45], your method should modify the queue to store [7, 8, 10, 45]. You may use one stack or queue as auxiliary storage.
Answer Preview: public static …

, Chapter: 2 -Problem: 5 >> Write a program that produces the following output using nested for loops. Use a class constant to make it possible to change the number of stairs in the figure. Transcribed Image Text: ******* /?* ****** ****** /? * ****** /?* ? ??????
Answer Preview: public class DrawStairs pu…

, Chapter: 11 -Problem: 9 >> Self-Check Problem 4 asked you to write code that would count the duplicates in a linked list. Rewrite your code as a method called countDuplicates that will allow either an ArrayList or a LinkedList to be passed as the parameter. Data from Problem 4Write a piece of code that counts the number of duplicate elements in a linked list, that is, the number of elements whose values are repeated at an e
Answer Preview: public static int count Duplicates Li…

, Chapter: 6 -Problem: 18 >> Write a program that takes as input lines of text like the following:This is sometext here.The program should produce as output the same text inside a box, as in the following:Your program will have to assume some maximum line length (e.g., 12 in this case). Transcribed Image Text: -+ This is some |
Answer Preview: Program that takes as input lines of text and prod…

, Chapter: 14 -Problem: 7 >> Write a method called reverseHalf that accepts a queue of integers as a parameter and reverses the order of all the elements in oddnumbered positions (position 1, 3, 5, etc.), assuming that the first value in the queue has position 0. For example, if the queue stores [1, 8, 7, 2, 9, 18, 12, 0] , your method should change it to store [1, 0, 7, 18, 9, 2, 12, 8] . Notice that numbers in even position
Answer Preview: public void reverseHalf Queue q Stack s n…

, Chapter: 12 -Problem: 16 >> Write a recursive method called evenDigits that accepts an integer parameter and that returns the integer formed by removing the odd digits from it. For example, evenDigits(8342116) returns 8426 and evenDigits (-34512) returns -42. If the number is 0 or has no even digits, such as 35159 or 7, return 0. Leading zeros in the result should be ignored.
Answer Preview: public static int evenDigits in…

, Chapter: 4 -Problem: 5 >> Write a method called pow that accepts a base and an exponent as parameters and returns the base raised to the given power. For example, the call pow(3, 4) should return 3 * 3 * 3 * 3, or 81. Assume that the base and exponent are nonnegative.
Answer Preview: Returns base raised to exponent power Preconditio…

, Chapter: 19 -Problem: 4 >> Rewrite the SideEffect program from this section so that it does not contain any side effects. Rather than modifying a global variable, make the function accept the value of x to use as a parameter.
Answer Preview: Rewritten version of the program with no side effect…

, Chapter: 1 -Problem: 7 >> Write a complete Java program called Mantra that prints the following output. Use at least one static method besides main. Transcribed Image Text: There's one thing every coder must understand: The System.out.println command. There's one thing every coder must understand: The System.out.println comm
Answer Preview: public class Mantra public static void mainSt…

, Chapter: 13 -Problem: 3 >> Write a program that processes a data file of students’ course grade data. The data arrive in random order; each line stores information about a student’s last name, first name, student ID number, grade as a percentage, and letter grade. For example, here are a few lines of data:Your program should be able to sort the data by any of the columns. Use Comparators to achieve the sort orderings. Make
Answer Preview: The java code is as follows It uses the to file inputtxt to read the data inputtxt Smith Kelly 438975 986 A Johnson Gus 210498 724 C Reges Stu 098736 882 B Smith Marty 346282 841 B Reges Abe 298575 78…

, Chapter: 7 -Problem: 1 >> Java’s type int has a limit on how large an integer it can store. This limit can be circumvented by representing an integer as an array of digits. Write an interactive program that adds two integers of up to 50 digits each.
Answer Preview: This assignment will give you practice with external input files and arrays You are going to write a program that adds together large integers The builtin type int has a maximum value of 2147483647 An…

, Chapter: 15 -Problem: 25 >> Why is it important to set empty elements to null when we are clearing or removing from the list of type E, when we didn’t need to clear out these elements in the previous ArrayIntList? Data from Previous ExerciseWhat is an annotation? How are annotations useful in writing our ArrayList class?
Answer Preview: It is important to set th…

, Chapter: 10 -Problem: 15 >> Write the output produced when the following method is passed each of the following lists:a. [2, 6, 1, 8]b. [30, 20, 10, 60, 50, 40]c. [-4, 16, 9, 1, 64, 25, 36, 4, 49] Transcribed Image Text: public static void mystery1 (ArrayList list) { for (int i = list.size () - 1; i > 0; i--) { if (list.get (i
Answer Preview: Output produced when th…

, Chapter: 4 -Problem: 1 >> Write a program that prompts for a number and displays it in Roman numerals.
Answer Preview: public class RomanNumerals public static void main String args System out println T…

, Chapter: 2 -Problem: 19 >> Use your pseudocode from the previous exercise to write a Java program called Window that produces the preceding figure as output. Use nested for loops to print the repeated parts of the figure. Once you get it to work, add a class constant so that the size of the figure can be changed simply by changing the constant’s value.
Answer Preview: Draws a resizable window figure with n…

, Chapter: 2 -Problem: 12 >> Write nested for loops that produce the following output:000111222333444555666777888999000111222333444555666777888999000111222333444555666777888999
Answer Preview: fo…

, Chapter: 11 -Problem: 3 >> Write a program that solves the classic “random writer” problem. This problem deals with reading input files of text and examining the frequencies of characters. On the basis of those frequencies, you can generate randomized output that appears to match the writing style of the original document. The longer the chains you link together, the more accurate the random text will sound. For example, le
Answer Preview: import javautilRandom class Database private Random generator new Random p…

, Chapter: 14 -Problem: 6 >> If you create a new empty queue and add the values 1, 2, and 3 in that order, and call remove on the queue once, what value will be returned?
Answer Preview: The valu…

, Chapter: 10 -Problem: 8 >> Write a method called maxLength that takes an ArrayList of String s as a parameter and that returns the length of the longest String in the list. If your method is passed an empty ArrayList, it should return 0.
Answer Preview: public static int maxLength …

, Chapter: 18 -Problem: 21 >> Draw the tree for the binary min-heap that results from inserting 11, 9, 12, 14, 3, 15, 7, 8, 1 in that order into an initially empty heap.
Answer Preview: The resulting bi…

, Chapter: 1 -Problem: 2 >> Sometimes we write similar letters to different people. For example, you might write to your parents to tell them about your classes and your friends and to ask for money; you might write to a friend about your love life, your classes, and your hobbies; and you might write to your brother about your hobbies and your friends and to ask for money. Write a program that prints similar letters such as
Answer Preview: public class Letters public static void mainString args mom andy wendy a letter to Mom public static void mom SystemoutprintlnDear Mom Systemoutprintl…

, Chapter: 2 -Problem: 7 >> Write nested for loops to produce the following output: Transcribed Image Text: 4 2.
Answer Preview: fo…

, Chapter: 13 -Problem: 29 >> Which one of the following statements about sorting and big-Oh is true?a. Selection sort can sort an array of integers in O(N) time.b. Merge sort achieves an O(N log N) runtime by dividing the array in half at each step and then recursively sorting and merging the halves back together.c. Merge sort runs faster than selection sort because it is recursive, and recursion is faster than loops.d. Selec
Answer Preview: The following statement about sorting and …

, Chapter: 14 -Problem: 15 >> What is the output of the following code?Queue q = new LinkedList<>();q.add(10);q.add(4);System.out.println(q.size());System.out.println(q.peek());q.add(6);System.out.println(q.remove());q.add(3);System.out.println(q.remove());System.out.println(q.peek());System.out.println(q.remove());q.add(7);System.out.println(q.peek());
Answer Preview: The code p…

, Chapter: 12 -Problem: 18 >> Sometimes the parameters that a client would like to pass to a method don’t match the parameters that are best for writing a recursive solution to the problem. What should a programmer do to resolve this issue?
Answer Preview: When the parameters needed for recursion don t …

, Chapter: 15 -Problem: 20 >> Write a method called rotate that moves the value at the front of a list of integers to the end of the list. For example, if a variable called list stores [8, 23, 19, 7, 12, 4], the call of list.rotate(); should move the value 8 from the front of the list to the back of the list, producing [23, 19, 7, 12, 4, 8].
Answer Preview: public void rotate () { if (size > 0) …

, Chapter: 1 -Problem: 1 >> Write a program to spell out MISSISSIPPI using block letters like the following (one per line): Transcribed Image Text: M IIIII sssss PPPPPP MM MM S P M M M M I P P M M M Sssss PPPPPP M M S M M S P M M IIIII SSSss P
Answer Preview: public class Mississippi public static void mainString args printM printIss printIss printI p…

, Chapter: 11 -Problem: 16 >> Write a method called is1to1 that accepts a map whose keys and values are strings as its parameter and returns true if no two keys map to the same value. For example, {Marty=206–9024, Hawking=123–4567, Smith=949–0504, Newton=123–4567} should return false, but {Marty=206–9024, Hawking=555–1234, Smith=949–0504, Newton=123–4567} should return true. The empty map is considered 1-to-1 and returns true.
Answer Preview: public static boolean isltol Map map …

, Chapter: 14 -Problem: 15 >> Write a method called isSorted that accepts a stack of integers as a parameter and returns true if the elements in the stack occur in ascending (nondecreasing) order from top to bottom. That is, the smallest element should be on top, growing larger toward the bottom. For example, if the stack stores [20, 20, 17, 11, 8, 8, 3, 2], your method should return true. An empty or one-element stack is cons
Answer Preview: public static boolean is Sorted Stack s if s size 2 retur…

, Chapter: 10 -Problem: 23 >> Write code to read a line of input from the user and print the words of that line in sorted order, without removing duplicates. For example, the program output might look like the following: Transcribed Image Text: Type a message to sort: to be or not to be that is the question Your message sorted:
Answer Preview: Code to read a line of input from the user and print the words of that line in sorted order S…

, Chapter: 1 -Problem: 24 >> What would have been the output of the preceding program if the third method had contained the following statements? Transcribed Image Text: public static void third () { first (); second (); System.out.println ("Inside third method");
Answer Preview: Output of Strange2 program Inside first method In…

, Chapter: 13 -Problem: 16 >> Write a Comparator that compares String objects by the number of words they contain. Consider any nonwhitespace string of characters to be a word. For example, “hello” comes before “I see”, which comes before “You can do it”.
Answer Preview: Compares Strings by their number of words import javautil public class StringWordC…

, Chapter: 15 -Problem: 4 >> In this version of the list class, what happens if the client adds too many values to fit in the array?
Answer Preview: In this section s version o…

, Chapter: 12 -Problem: 14 >> Consider the following method:For each of the following calls, indicate the value that is returned:a. mystery5(5, 7)b. mystery5(12, 9)c. mystery5(-7, 4)d. mystery5( – 23, –48)e. mystery5(128, 343) Transcribed Image Text: public static int mystery5 (int x, int y) { if (x < 0) { return -mystery5 (-x,
Answer Preview: Value returned b…

, Chapter: 16 -Problem: 21 >> Write a method called surroundWith that takes an integer x and an integer y as parameters and surrounds all nodes in the list containing the value x with new nodes containing the value y. In particular, each node that contains the value x as data should have a new node just before it and just after it that each contain the value y. If no nodes in the list contain the value x, then the list should
Answer Preview: public void surroundWith (int x, int y) { if (front == null) { return; taget } ListNode cu…

, Chapter: 1 -Problem: 2 >> Write a complete Java program called Spikey that prints the following output: Transcribed Image Text: W// /// 1/? ?
Answer Preview: public class Spikey public static …

, Chapter: 13 -Problem: 9 >> Using the same arrays from the previous problem, trace the complete execution of the merge sort algorithm when called on each array. Show the subarrays that are created by the algorithm and show the merging of subarrays into larger sorted arrays. Data from Previous ExerciseWrite the state of the elements of each of the following arrays after each pass of the outermost loop of the selection sort al
Answer Preview: Merge sort 1st split 2nd split 3rd split 1st merge 2nd merge 3rd merge 1st split 2…

, Chapter: 14 -Problem: 21 >> Write a method called maxToTop that takes a stack of integers as a parameter and moves the largest value in the stack to the top of the stack, leaving all other values in their original order. You may assume that the stack does not contain any duplicates. For example, if a stack s stores [27, 5, 42, -11, 0, 19] , the call of maxToTop(s) should change it to store [27, 5, -11, 0, 19, 42] . If the st
Answer Preview: public static void maxToTop Stack stack if stack isEmpty Laget retur…

, Chapter: 12 -Problem: 24 >> Write a recursive method called printSquares to find all ways to express an integer as a sum of squares of unique positive integers. For example, the call printSquares(200); should produce the following output:Some numbers (such as 128 or 0) cannot be represented as a sum of squares, in which case your method should produce no output. Keep in mind that the sum has to be formed with unique integers
Answer Preview: Prints all ways to express n as a sum of squares of un…

, Chapter: 2 -Problem: 31 >> What is the output of the following sequence of loops? Transcribed Image Text: for (int i = 1; i <= 2; i++) { for (int j = 1; j <= 3; j++) { for (int k = 1; k <= 4; k++) { %3D System.out.print ("*"); System.out.print ("!"); System.out.println ();
Answer Preview: Out…

, Chapter: 11 -Problem: 5 >> Write a piece of code that inserts a String into an ordered linked list of Strings, maintaining sorted order. For example, for the list ["Alpha", "Baker", "Foxtrot", "Tango", "Whiskey"], inserting "Charlie" in order would produce the list [" Alpha", "Baker", "Charlie", "Foxtrot", "Tango", "Whiskey"] .
Answer Preview: public static void insertInOrder LinkedList li…

, Chapter: 14 -Problem: 3 >> Write a method called copyStack that accepts a stack of integers as a parameter and returns a copy of the original stack (i.e., a new stack with the same values as the original, stored in the same order as the original). Your method should create the new stack and fill it up with the same values that are stored in the original stack. When your method is done executing, the original stack must be r
Answer Preview: public Stack copyStack Stack s s2 new …

, Chapter: 12 -Problem: 15 >> Write a recursive method vowelsToEnd that takes a string as a parameter and returns a string in which all of the vowels have been moved to the end. The vowels should appear in reverse order of what they were in the original word. For example, the call of vowelsToEnd("beautifully") should return "btfllyuiuae".
Answer Preview: public sta…

, Chapter: 19 -Problem: 6 >> Write a lambda expression that converts an integer into the square of that integer; for example, 4 would become 16.
Answer Preview: (x…

, Chapter: 4 -Problem: 25 >> Consider a method printTriangleType that accepts three integer arguments representing the lengths of the sides of a triangle and prints the type of triangle that these sides form. The three types are equilateral, isosceles, and scalene. An equilateral triangle has three sides of the same length, an isosceles triangle has two sides that are the same length, and a scalene triangle has three sides of
Answer Preview: The preconditions of printTriangleType m…

, Chapter: 11 -Problem: 10 >> A List has every method that a Set has, and more. So why would you use a Set rather than a List?
Answer Preview: You should use a Set rath…

, Chapter: 15 -Problem: 19 >> Write a method called compress that replaces every pair of elements in the list with a single element equal to the sum of the pair. If the list is of odd size, leave the last element unchanged. For example, if the list stores [1, 7, 3, 9, 4, 6, 5], your method should change it to store [8, 12, 10, 5] (1 + 7, and 3 + 9, then 4 + 6, then 5).
Answer Preview: public void compress for int i …

, Chapter: 4 -Problem: 14 >> Write a piece of code that reads a shorthand text description of a playing card and prints the longhand equivalent. The shorthand description is the card’s rank ( 2 through 10, J, Q, K, or A ) followed by its suit ( C, D, H, or S ). You should expand the shorthand into the form “ of ”. You may assume that the user types valid input. Here are two sample executions:
Answer Preview: Code to read playing card information Scanner console new Scanner System …

, Chapter: 4 -Problem: 20 >> What output is produced by the following program? Transcribed Image Text: 1 public class CharMystery { public static void printRange (char startLetter, char endLetter) { for (char letter = startLetter; letter <= endLetter; %3D letter++) { 4 System.out.print (letter); System.out.println (); 7 } publi
Answer Preview: Output o…

, Chapter: 11 -Problem: 18 >> What keys and values are contained in the following map after this code executes?Map map = new HashMap<>();map.put(8, "Eight");map.put(41, "Forty-one");map.put(8, "Ocho");map.put(18, "Eighteen");map.put(50, "Fifty");map.put(132, "OneThreeTwo");map.put(28, "Twenty-eight");map.put(79, "Seventy-nine");map.remove(41);map.remove(28);map.remove("Eight");map.put(50, "Forty-one");map.put(28, "18");map.rem
Answer Preview: Keys and values contained …

, Chapter: 15 -Problem: 5 >> Why does the list class use a toString method rather than a print method?
Answer Preview: We use a toString method because this is the …

, Chapter: 12 -Problem: 7 >> Convert the following iterative method into a recursive method:= 0; i--) { System.out.print (s.charAt (i)); System.out.print (s.charAt (i));" class="fr-fic fr-dib" width="578" height="290"> Transcribed Image Text: // Prints each character of the string reversed twice. // doubleReverse ("hello") prin
Answer Preview: Recursive version of doubleReverse method …

, Chapter: 3 -Problem: 13 >> Write a program called Football that uses the DrawingPanel to draw the figure shown in Figure 3G.34. Though the figure looks to contain curves, it is entirely made of straight lines.The window is 250 x 250 pixels in size. There is an outer rectangle from (10, 30) to (210, 230), and a set of black lines drawn around the edges every 10 pixels. For example, along the top-left there is a line from (10
Answer Preview: import java awt public class Football public static void main S…

, Chapter: 5 -Problem: 26 >> Write code that prompts for three integers, averages them, and prints the average. Make your code robust against invalid input.
Answer Preview: Write code that prompts for three integers averages them and prints t…

, Chapter: 13 -Problem: 17 >> Why does the binary search algorithm require the input to be sorted?
Answer Preview: Binary search requires a sorted data…

, Chapter: 14 -Problem: 20 >> Write a method called interleave that accepts a queue of integers as a parameter and rearranges the elements by alternating the elements from the first half of the queue with those from the second half of the queue. For example, if the queue stores [2, 8, ?5, 19, 7, 3, 24, 42] , your method should change it to store [2, 7, 8, 3, ?5, 24, 19, 42]. To understand the result, consider the two halves of
Answer Preview: public static void interleave Queue q if q size 2 0 throw new Ill…

, Chapter: 12 -Problem: 21 >> Write Java code to create and draw a regular hexagon (a type of polygon).
Answer Preview: Code to create and draw a regular hexagon public static void drawHexagon Graphics g P…

, Chapter: 3 -Problem: 19 >> Write a method called printReverse that accepts a string as its parameter and prints the characters in opposite order. For example, a call of printReverse("hello there!") should print "!ereht olleh". If the empty string is passed, the method should produce no output.
Answer Preview: public static void print…

, Chapter: 18 -Problem: 25 >> Draw the array representation of the heap you computed as your answer to Self-Check Problem 19 (after all of the elements are added to it). Data from Self Problem 19Draw the tree for the binary min-heap that results from inserting 4, 9, 3, 7, 2, 5, 8, 6 in that order into an initially empty heap.
Answer Preview: Array representation o…

, Chapter: 1 -Problem: 12 >> What is the output produced from the following statements?System.out.println("Dear "DoubleSlash" magazine,");System.out.println();System.out.println("tYour publication confuses me. Is it");System.out.println("a \\ slash or a //// slash?");System.out.println("Sincerely,");System.out.println("Susan "Suzy" Smith");
Answer Preview: Output of statements Dear …

, Chapter: 13 -Problem: 25 >> Trace the execution of the selection sort algorithm as shown in this section when run on the following input arrays. Show each element that will be selected by the algorithm and where it will be moved, until the array is fully sorted.a. {29, 17, 3, 94, 46, 8, –4, 12}b. {33, 14, 3, 95, 47, 9, –42, 13}c. {7, 1, 6, 12, –3, 8, 4, 21, 2, 30, –1, 9}d. {6, 7, 4, 8, 11, 1, 10, 3, 5, 9}
Answer Preview: All steps of selection sort algorithm …

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, Chapter: 12 -Problem: 27 >> If our 8 Queens algorithm tried every possible s

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