Question

Part 1: Song Class Write the code for the Song class. 1. Instance variables: title:String, lyrics:String, numAwards:int 2. For the 2-arg constructor (parameters are title and lyrics), use the following default value: - numAwards: 3 3. Create the 3-argument constructor. 4. No additionalconstructors. 5. Generate all getters and setters for instance variables 6. toString: Return a nicely formatted string describing this object 7. toSummary: This instance method will return a String that contains up to the first 10 characters of the lyrics. Be sure to handle the case where the lyrics are shorter than 10 chars. No explicit parameters. 8. isGoodSong: This instance method with no parameters will return true if BOTH of the following are true: - Number of awards > 3 AND - Title starts with “Fun” or “Dance” (case insensitive) 9. countHappy: This instance method with no parameters will return the number of times "happy" appears anywhere in the lyrics. This comparison is case insensitive.

Part 2: SongTester 10. Download the starter file for SongTester.java from the D2L dropbox. 11. Run the existing SongTester.java to test out your countHappy and isWinningSong methods. Fix any problems indicated by these test cases 12. sumAwards: In SongTester.java, create a static method called sumAwards. It should have an ArrayList as a parameter. The method should return the total number of awards (an int) all of the songs in the list have won. 13. In the main method: - Create at least 5 Song objects - Place the objects in an ArrayList of Songs named songAL. - Test your toSummary method using the songAL ArrayList. Fix if needed. - For the song at index 1, replace the lyrics with “Na-na-na-boo-boo”. - Call the sumAwards method using the songAL as a parameter. SOP the result.

This is the SongTester Method

public class SongTester
{

/**
* ****DO NOT MODIFY this method****
* This method returns the percentage of test cases
* that the isGoodSong method has succesfully passed
* @return percentage of correct test cases
*/
public static double testisGoodSong()
{
Song song1 = new Song("", "");
int countCorrect = 0;

song1.setNumAwards(5);
song1.setTitle("Dance revolution");
if ( song1.isGoodSong())
{
countCorrect++;
}
else
{
System.err.println("isGoodSong case1 failed");
}

song1.setNumAwards(1);
song1.setTitle("Fun in the sun");
if ( !song1.isGoodSong())
{
countCorrect++;
}
else
{
System.err.println("isGoodSong case2 failed");
}

song1.setNumAwards(0);
song1.setTitle("Fun in the sun");
if ( !song1.isGoodSong())
{
countCorrect++;
}
else
{
System.err.println("isGoodSong case3 failed");
}

song1.setNumAwards(2);
song1.setTitle("Not winning");
if ( !song1.isGoodSong())
{
countCorrect++;
}
else
{
System.err.println("isGoodSong case4 failed");
}
return countCorrect/4.0*100;
}

/**
* ****DO NOT MODIFY this method****
* This method returns the percentage of test cases
* that the countHappy method has succesfully passed
* @return percentage of correct test cases
*/
public static double testcountHappy()
{
Song song1 = new Song("Default", "Short one");
int countCorrect = 0;

if ( song1.countHappy() == 0)
{
countCorrect++;
}
else
{
System.err.println("countHappy case1 failed");
}

song1.setLyrics("Happy haPPy");
if ( song1.countHappy() == 2)
{
countCorrect++;
}
else
{
System.err.println("countHappy case2 failed");
}

song1.setLyrics("Lots of lyrics. Example of long lyric with HAPPY!!!!!! in middle");
if ( song1.countHappy() == 1)
{
countCorrect++;
}
else
{
System.err.println("countHappy case3 failed");
}
song1.setLyrics("My happy song. My happyhappyhappy song. Is happily happy song. happy");
if ( song1.countHappy() == 6)
{
countCorrect++;
}
else
{
System.err.println("countHappy case4 failed");
}
return countCorrect/4.0*100;
}

public static void main(String[] args)
{
System.out.println("Percent correct for isGoodSong: " + testisGoodSong() );
System.out.println("Percent correct for countHappy: " + testcountHappy() );

}
}

Answer 1

//Java code

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Song {
    /**
     *  Instance variables:
     *  title:String,
     *  lyrics:String,
     *  numAwards:int
     */
    private String title;
    private String lyrics;
    private int numAwards;
    /**
     * For the 2-arg constructor
     * (parameters are title and lyrics),
     * use the following default value: - numAwards: 3
     */
    public Song(String title,String lyrics)
    {
        this.title= title;
        this.lyrics = lyrics;
        numAwards =3;
    }
    /**
     *  Create the 3-argument constructor.
     */
    public Song(String title, String lyrics, int numAwards) {
        this.title = title;
        this.lyrics = lyrics;
        this.numAwards = numAwards;
    }
    /**
     * . Generate all getters and setters for instance variables
     */
    public String getTitle() {
        return title;
    }

    public String getLyrics() {
        return lyrics;
    }

    public int getNumAwards() {
        return numAwards;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public void setLyrics(String lyrics) {
        this.lyrics = lyrics;
    }

    public void setNumAwards(int numAwards) {
        this.numAwards = numAwards;
    }
    /**
     *  toString:
     *  Return a nicely formatted string describing this object
     */
    @Override
    public String toString() {
        return "Song Title: "+title+"\nLyrics"+lyrics+"\nNum of Awards: "+numAwards;

    }
    /**
     * toSummary: This instance method will return a String
     * that contains up to the first 10 characters of the lyrics.
     * Be sure to handle the case where the
     * lyrics are shorter than 10 chars. No explicit parameters.
     */
    public String toSummary()
    {
        if(lyrics.length()<10)
            return lyrics.substring(0,lyrics.length()-1);
        else
        return lyrics.substring(0,9);
    }
    /**
     * isGoodSong: This instance method with no parameters
     * will return true
     * if BOTH of the following are true:
     * - Number of awards > 3 AND - Title starts with “Fun” or “Dance”
     * (case insensitive)
     */
    public boolean isGoodSong()
    {

        if(numAwards>3 && (title.toUpperCase().startsWith("FUN")||title.toUpperCase().startsWith("DANCE")))
            return true;
        else
            return false;
    }
    /**
     * countHappy: This instance method with no parameters will
     * return the number of times "happy"
     * appears anywhere in the lyrics. This comparison is case insensitive.
     */
    public int countHappy()
    {
        int count=0;
        Pattern pattern = Pattern.compile("happy");
        Matcher m =pattern.matcher(lyrics.toLowerCase());
       while (m.find())
           count++;

        return count;
    }
}

import java.util.ArrayList;

public class SongTester
{

    /**
     * ****DO NOT MODIFY this method****
     * This method returns the percentage of test cases
     * that the isGoodSong method has succesfully passed
     * @return percentage of correct test cases
     */
    public static double testisGoodSong()
    {
        Song song1 = new Song("", "");
        int countCorrect = 0;

        song1.setNumAwards(5);
        song1.setTitle("Dance revolution");
        if ( song1.isGoodSong())
        {
            countCorrect++;
        }
        else
        {
            System.err.println("isGoodSong case1 failed");
        }

        song1.setNumAwards(1);
        song1.setTitle("Fun in the sun");
        if ( !song1.isGoodSong())
        {
            countCorrect++;
        }
        else
        {
            System.err.println("isGoodSong case2 failed");
        }

        song1.setNumAwards(0);
        song1.setTitle("Fun in the sun");
        if ( !song1.isGoodSong())
        {
            countCorrect++;
        }
        else
        {
            System.err.println("isGoodSong case3 failed");
        }

        song1.setNumAwards(2);
        song1.setTitle("Not winning");
        if ( !song1.isGoodSong())
        {
            countCorrect++;
        }
        else
        {
            System.err.println("isGoodSong case4 failed");
        }
        return countCorrect/4.0*100;
    }

    /**
     * ****DO NOT MODIFY this method****
     * This method returns the percentage of test cases
     * that the countHappy method has succesfully passed
     * @return percentage of correct test cases
     */
    public static double testcountHappy()
    {
        Song song1 = new Song("Default", "Short one");
        int countCorrect = 0;

        if ( song1.countHappy() == 0)
        {
            countCorrect++;
        }
        else
        {
            System.err.println("countHappy case1 failed");
        }

        song1.setLyrics("Happy haPPy");
        if ( song1.countHappy() == 2)
        {
            countCorrect++;
        }
        else
        {
            System.err.println("countHappy case2 failed");
        }

        song1.setLyrics("Lots of lyrics. Example of long lyric with HAPPY!!!!!! in middle");
        if ( song1.countHappy() == 1)
        {
            countCorrect++;
        }
        else
        {
            System.err.println("countHappy case3 failed");
        }
        song1.setLyrics("My happy song. My happyhappyhappy song. Is happily happy song. happy");
        if ( song1.countHappy() == 6)
        {
            countCorrect++;
        }
        else
        {
            System.err.println("countHappy case4 failed");
        }
        return countCorrect/4.0*100;
    }

    /**
     * a static method called sumAwards.
     * It should have an ArrayList as a parameter. The method should return
     * the total number of awards (an int) all of
     * the songs in the list have won.
     *
     */
    private static int sumAwards(ArrayList<Song> songs)
    {
        int sum=0;
        for (Song s:songs
             ) {
            sum +=s.getNumAwards();
        }
        return sum;
    }

    public static void main(String[] args)
    {
        System.out.println("Percent correct for isGoodSong: " + testisGoodSong() );
        System.out.println("Percent correct for countHappy: " + testcountHappy() );
        /**
         *  In the main method: - Create at least 5 Song objects
         *  - Place the objects in an ArrayList of Songs named songAL. -
         *  Test your toSummary method using the songAL ArrayList.
         *  Fix if needed. - For the song at index 1,
         *  replace the lyrics with “Na-na-na-boo-boo”. -
         *  Call the sumAwards method using the songAL as a parameter.
         *  SOP the result.
         */
        ArrayList<Song> songAL= new ArrayList<>();
        Song song1 = new Song("SONG1","Happy we are happy",4);
        Song song2 = new Song("SONG2","Na-na-na-boo-boo",5);
        Song song3 = new Song("SONG3","We are going alone",3);
        Song song4 = new Song("SONG4","Fun is the funny thing",5);
        Song song5 = new Song("SONG5","Distnace in nothing more...",7);
        //Add to array list
        songAL.add(song1);
        songAL.add(song2);
        songAL.add(song3);
        songAL.add(song4);
        songAL.add(song5);
        /*Test your toSummary method using the songAL ArrayList.*/
        for (Song song:songAL
             ) {
            System.out.println(song.toSummary());
        }
        /*Call the sumAwards method using the songAL as a parameter.*/
        System.out.println("Total number of awards: "+sumAwards(songAL));
    }
}

//Output

//if you need any help regarding this solution............... please leave a comment ........... thanks