Question

Use inheritance to create a new class AudioRecording based on Recording class that:

• it will retain all the members of the Recording class,

• it will have an additional field bitrate (non-integer numerical; it cannot be modified once set),

• its constructors (non-parametrized and parametrized) will set all the attributes / fields of this class (reuse code by utilizing superclass / parent class constructors):

  • Non-parametrized constructor should set bitrate to zero,

  • If arguments for the parametrized constructor are illegal or null, it should behave as parametrized constructor

• it will have an accessor / getter method for a new attribute field,

• it will NOT have a mutator / setter method for a new attribute / field,

• will override toString method

• NOTE: Modify Recording class to facilitate inheritance as you go if necessary

Here is the recording class:

class Recording{

   private String ARTIST;
   private String NAME;
   private int DURATION_IN_SECONDS;
     
   Recording(){
       ARTIST = "Unknown";
       NAME = "Unknown";
       DURATION_IN_SECONDS = 0;
   }
     
   Recording(String ARTIST, String NAME, int DURATION_IN_SECONDS){
       if (ARTIST != null && NAME != null && DURATION_IN_SECONDS >0){
           this.ARTIST = ARTIST;
           this.NAME = NAME;
           this.DURATION_IN_SECONDS = DURATION_IN_SECONDS;
       } else {
           this.ARTIST = "Unknown";
           this.NAME = "Unknown";
           this.DURATION_IN_SECONDS = 0;
       }
   }

  
   public String getArtist(){
       return this.ARTIST;
   }
  
   public String getName(){
       return this.NAME;
   }
  
   public int getDuration(){
       return this.DURATION_IN_SECONDS;
   }
  
   public void play(){
       if (DURATION_IN_SECONDS > 0){
           int s = DURATION_IN_SECONDS % 60;
           int h = DURATION_IN_SECONDS / 60;
           int m = h % 60;
          
       System.out.println("Now Playing:"+ARTIST+"-" +NAME+ "[" +m+"m" +s+"s]");
      
       }
       else {
           System.out.println("ERROR: cannot play this recording");
       }
   }
  
   @Override
   public String toString(){
           int s = DURATION_IN_SECONDS % 60;
           int h = DURATION_IN_SECONDS / 60;
           int m = h % 60;
       return ARTIST +"-"+NAME +"[" +m+"m" +s+"s]";
}
  

}

Answer 1

Thanks for the question.

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer.

Thanks!

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public class AudioRecording extends Recording {

    //additional field bitrate (non-integer numerical;
    private final double bitrate;

    //its constructors (non-parametrized)
    public AudioRecording() {
        super();
        //Non-parametrized constructor should set bitrate to zero,
        bitrate=0.0;
    }
    //its constructors (parametrized)
    public AudioRecording(double bitrate) {
        this.bitrate = bitrate;
    }

    //its constructors (parametrized)
    public AudioRecording(String ARTIST, String NAME, int DURATION_IN_SECONDS, double bitrate) {
        super(ARTIST, NAME, DURATION_IN_SECONDS);
        this.bitrate = bitrate;
    }

    //it will have an accessor / getter method for a new attribute field,
    public double getBitrate() {
        return bitrate;
    }

    //will override toString method

    @Override
    public String toString() {
        return super.toString()+" BitRate: "+getBitrate();
    }
}

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