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Thread: Making sure I answered this question completely.

  1. #1
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    Default Making sure I answered this question completely.

    Here's the question first of all: Change the PigLatinTranslator from chapter 4 so that its translatemethod is static. Change the PigLatin class so it invokes the method correctly.

    Original PigLatinTranslator

    import java.util.Scanner;
    public class PigLatinTranslator
    {
       //-----------------------------------------------------------------
       //  Translates a sentence of words into Pig Latin.
       //-----------------------------------------------------------------
       public String translate (String sentence)
       {
          String result = "";
          sentence = sentence.toLowerCase();
          Scanner scan = new Scanner (sentence);
          while (scan.hasNext())
          {
             result += translateWord (scan.next());
             result += " ";
          }
          return result;
       }
       //-----------------------------------------------------------------
       //  Translates one word into Pig Latin. If the word begins with a
       //  vowel, the suffix "yay" is appended to the word. Otherwise,
       //  the first letter or two are moved to the end of the word,
       //  and "ay" is appended.
       //-----------------------------------------------------------------
       private String translateWord (String word)
       {
          String result = "";
          if (beginsWithVowel(word))
             result = word + "yay";
          else
             if (beginsWithBlend(word))
                result = word.substring(2) + word.substring(0,2) + "ay";
             else
                result = word.substring(1) + word.charAt(0) + "ay";
          return result;
       }
    //-----------------------------------------------------------------
       // Determines if the specified word begins with a vowel.
       //-----------------------------------------------------------------
       private boolean beginsWithVowel (String word)
       {
          String vowels = "aeiou";
          char letter = word.charAt(0);
          return (vowels.indexOf(letter) != -1);
       }
       //-----------------------------------------------------------------
       //  Determines if the specified word begins with a particular
       //  two-character consonant blend.
       //-----------------------------------------------------------------
       private boolean beginsWithBlend (String word)
       {
          return ( word.startsWith ("bl") || word.startsWith ("sc") ||
                   word.startsWith ("br") || word.startsWith ("sh") ||
                   word.startsWith ("ch") || word.startsWith ("sk") ||
                   word.startsWith ("cl") || word.startsWith ("sl") ||
                   word.startsWith ("cr") || word.startsWith ("sn") ||
                   word.startsWith ("dr") || word.startsWith ("sm") ||
                   word.startsWith ("dw") || word.startsWith ("sp") ||
                   word.startsWith ("fl") || word.startsWith ("sq") ||
                   word.startsWith ("fr") || word.startsWith ("st") ||
                   word.startsWith ("gl") || word.startsWith ("sw") ||
                   word.startsWith ("gr") || word.startsWith ("th") ||
                   word.startsWith ("kl") || word.startsWith ("tr") ||
                   word.startsWith ("ph") || word.startsWith ("tw") ||
                   word.startsWith ("pl") || word.startsWith ("wh") ||
                   word.startsWith ("pr") || word.startsWith ("wr") );
       }
    }

    Original PigLatin

    import java.util.Scanner;
    public class PigLatin
    {
       //-----------------------------------------------------------------
       //  Reads sentences and translates them into Pig Latin.
       //-----------------------------------------------------------------
       public static void main (String[] args)
       {
          String sentence, result, another = "y";
          Scanner scan = new Scanner (System.in);
          PigLatinTranslator translator = new PigLatinTranslator();
          while (another.equalsIgnoreCase("y"))
          {
             System.out.println ();
             System.out.println ("Enter a sentence (no punctuation):");
             sentence = scan.nextLine();
             System.out.println ();
             result = translator.translate (sentence);
             System.out.println ("That sentence in Pig Latin is:");
             System.out.println (result);
             System.out.println ();
             System.out.print ("Translate another sentence (y/n)? ");
             another = scan.nextLine();
          }
       }
    }

    Editited PigLatinTranslator:

    import java.util.Scanner;
    public class PigLatinTranslator
    {
       //-----------------------------------------------------------------
       //  Translates a sentence of words into Pig Latin.
       //-----------------------------------------------------------------
       public static String translate (String sentence)
       {
          String result = "";
          sentence = sentence.toLowerCase();
          Scanner scan = new Scanner (sentence);
          while (scan.hasNext())
          {
             result += translateWord (scan.next());
             result += " ";
          }
          return result;
       }
       //-----------------------------------------------------------------
       //  Translates one word into Pig Latin. If the word begins with a
       //  vowel, the suffix "yay" is appended to the word. Otherwise,
       //  the first letter or two are moved to the end of the word,
       //  and "ay" is appended.
       //-----------------------------------------------------------------
       private static String translateWord (String word)
       {
          String result = "";
          if (beginsWithVowel(word))
             result = word + "yay";
          else
             if (beginsWithBlend(word))
                result = word.substring(2) + word.substring(0,2) + "ay";
             else
                result = word.substring(1) + word.charAt(0) + "ay";
          return result;
       }
    //-----------------------------------------------------------------
       // Determines if the specified word begins with a vowel.
       //-----------------------------------------------------------------
       private static boolean beginsWithVowel (String word)
       {
          String vowels = "aeiou";
          char letter = word.charAt(0);
          return (vowels.indexOf(letter) != -1);
       }
       //-----------------------------------------------------------------
       //  Determines if the specified word begins with a particular
       //  two-character consonant blend.
       //-----------------------------------------------------------------
       private static boolean beginsWithBlend (String word)
       {
          return ( word.startsWith ("bl") || word.startsWith ("sc") ||
                   word.startsWith ("br") || word.startsWith ("sh") ||
                   word.startsWith ("ch") || word.startsWith ("sk") ||
                   word.startsWith ("cl") || word.startsWith ("sl") ||
                   word.startsWith ("cr") || word.startsWith ("sn") ||
                   word.startsWith ("dr") || word.startsWith ("sm") ||
                   word.startsWith ("dw") || word.startsWith ("sp") ||
                   word.startsWith ("fl") || word.startsWith ("sq") ||
                   word.startsWith ("fr") || word.startsWith ("st") ||
                   word.startsWith ("gl") || word.startsWith ("sw") ||
                   word.startsWith ("gr") || word.startsWith ("th") ||
                   word.startsWith ("kl") || word.startsWith ("tr") ||
                   word.startsWith ("ph") || word.startsWith ("tw") ||
                   word.startsWith ("pl") || word.startsWith ("wh") ||
                   word.startsWith ("pr") || word.startsWith ("wr") );
       }
    }

    Is this all I would need to do or is there more to it? Thanks in advance!


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Making sure I answered this question completely.

    I'm assuming you made the changes to your PigLatin class to let you run it?

    Did you try running it to see if it works?

  3. #3
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    Default Re: Making sure I answered this question completely.

    I didn't edit PigLatin but it runs perfectly.

  4. #4
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    Default Re: Making sure I answered this question completely.

    Oh dur, of course it'll run...

    The second half of the question does ask you to modify your PigLatin class to call the static method directly. It's always a good idea to call static methods using the class reference rather than an object reference, though technically it's not required (which I forgot this last point).

    This basically means that instead of creating a PigLatinTranslator object and calling the method, you use the class qualifier.

    // calling a static method
    SomeClass.someMethod(); // no object is used to call static methods, just the class reference

  5. #5
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    Default Re: Making sure I answered this question completely.

    Right, I replaced the new statement in PigLatin with PigLatinTranslator.translate(); but it gives me an error saying ican't apply () to translate.

  6. #6
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    Default Re: Making sure I answered this question completely.

    Could you post your updated PigLatin code?

  7. #7
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    Default Re: Making sure I answered this question completely.

    yeah sure, I figured out i need to put in the parameter sentence, but NOW it says i need to initialize sentence.

    import java.util.Scanner;
    public class PigLatin
    {
       //-----------------------------------------------------------------
       //  Reads sentences and translates them into Pig Latin.
       //-----------------------------------------------------------------
       public static void main (String[] args)
       {
          String sentence, result, another = "y";
          Scanner scan = new Scanner (System.in);
          PigLatinTranslator.translate(sentence);
          while (another.equalsIgnoreCase("y"))
          {
             System.out.println ();
             System.out.println ("Enter a sentence (no punctuation):");
             sentence = scan.nextLine();
             System.out.println ();
             result = PigLatinTranslator.translate (sentence);
             System.out.println ("That sentence in Pig Latin is:");
             System.out.println (result);
             System.out.println ();
             System.out.print ("Translate another sentence (y/n)? ");
             another = scan.nextLine();
          }
       }
    }

  8. #8
    Super Moderator helloworld922's Avatar
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    Default Re: Making sure I answered this question completely.

       public static void main (String[] args)
       {
          String sentence, result, another = "y";
          Scanner scan = new Scanner (System.in);
          PigLatinTranslator.translate(sentence);
          while (another.equalsIgnoreCase("y"))

    Notice the second to last line, I think you left this in there from an earlier experiment.

  9. #9
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    Default Re: Making sure I answered this question completely.

    Yep, all good now.

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