Starting out with java from control structures through data structures 3rd edition gaddis solutions

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Gaddis: Starting Out with Java: From Control Structures through Data Structures, 3/e

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Starting Out with Java - From Control Structures through Data Structures Answers to Review Questions Chapter 9 Multiple Choice and True/False 1. c 2. b 3. a 4. a 5. a 6. c 7. b 8. a 9. d 10. b 11. a 12. c 13. d 14. a 15. False 16. True 17. False 18. True 19. True 20. False 21. True 22. False 23. False Find the Error 1.

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The valueOf method is static. It should be called like this: str = String.valueOf(number); You cannot initialize a StringBuilder object with the = operator. You must pass the string as an argument to the constructor, such as: StringBuilder name = new StringBuilder("Joe Schmoe"); The very first character is at position 0, so the statement should read: str.setCharAt(0, 'Z'); The tokens variable should reference the array of tokens returned by the str.split method, so the statement should read: String[] tokens = str.split(";") You cannot print the tokens to the screen by simply passing the tokens variable as an argument to System.out.println. If the tokens are to be printed to the

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Gaddis: Starting Out with Java: From Control Structures through Data Structures, 3/e screen, a loop should be used to process each element in the array, so the statement should read: for (String s : tokens) System.out.println(s) Algorithm Workbench 1.

if (Character.toUpperCase(choice) == 'Y') Or if (Character.toLowerCase(choice) == 'y')

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int total = 0; for (int i = 0; i < str.length(); i++) { if (str.charAt(i) == ' ') total++; }

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int total = 0; for (int i = 0; i < str.length(); i++) { if (Character.isDigit(str.charAt(i))) total++; }

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int total = 0; for (int i = 0; i < str.length(); i++) { if (Character.isLowerCase(str.charAt(i))) total++; }

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public static boolean dotCom(String str) { boolean status; if (str.endsWith(".com")) status = true; else status = false; return status; }

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Gaddis: Starting Out with Java: From Control Structures through Data Structures, 3/e 6.

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public static boolean dotCom(String str) { boolean status; String str2 = str.toLowerCase(); if (str2.endsWith(".com")) status = true; else status = false; return status; }

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public static void upperT(StringBuilder str) { for (int i = 0; i < str.length(); i++) { if (str.charAt(i) == 't') str.setCharAt(i, 'T'); } } String str = "cookies>milk>fudge:cake:ice cream"; String[] tokens = str.split("[>:]"); for (int i = 0; i < (tokens.length - 1); i++) { System.out.printf("%s, ", tokens[i]); } System.out.printf("and %s\n", tokens[tokens.length - 1]); if (d <= Integer.MAX_VALUE) i = (int) d;

10. System.out.println(Integer.toBinaryString(i)); System.out.println(Integer.toHexString(i)); System.out.println(Integer.toOctalString(i)); Short Answer 1.

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This will improve the program’s efficiency by reducing the number of String objects that must be created and then removed by the garbage collector.

When you are tokenizing a string that was entered by the user, and you are using characters other than whitespaces as delimiters, you will probably want to trim the string before tokenizing it. Otherwise, if the user enters leading whitespace

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Gaddis: Starting Out with Java: From Control Structures through Data Structures, 3/e

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characters, they will become part of the first token. Likewise, if the user enters trailing whitespace characters, they will become part of the last token.

Converts a number to a string.

Each of the numeric wrapper classes has final static fields named MAX_VALUE and MIN_VALUE. These fields hold the maximum and minimum values for the data type.

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