Tugas - Inheritance

1. Class abstract Disc untuk menjadi parent

abstract class Disc{
    String title;
    int playingTime;
    boolean gotIt;
    String comment;
    
    public void setComment(String comment){
        this.comment = comment;
    }
    
    public String getComment(){
        return comment;
    }
    
    public void setOwn(boolean own){
        gotIt = own;
    }
    
    public boolean getOwn(){
        return gotIt;
    }
    
    
}

2. Class CD dg parent Disc

public class CD extends Disc{
    private String artist;
    private int numberOfTracks;
    
    public CD(String title, String artist, int tracks, int time){
        this.title = title;
        this.artist = artist;
        numberOfTracks = tracks;
        playingTime = time;
        gotIt = false;
        comment = "<no comment>";
    }

    public void print(){
        System.out.println("CD: "+title+" ("+playingTime+" mins)");
        System.out.println("    by "+artist);
        System.out.println("    "+numberOfTracks+" tracks");
        System.out.println("    Info: "+comment);
        if(gotIt){
            System.out.println("You own this CD");
        }
        else
            System.out.println("You don't have this CD");
    }
}

3. Class DVD dg parent Disc

public class DVD extends Disc{
    private String director;
    
    public DVD(String title, String director, int time){
        this.title = title;
        this.director = director;
        playingTime = time;
        gotIt = false;
        comment = "<no comment>";
    }
    
    public void print(){
        System.out.println("DVD: "+title+" ("+playingTime+" mins)");
        System.out.println("    by "+director);
        System.out.println("    Info: "+comment);
        if(gotIt)
            System.out.println("You own this DVD");
        else
            System.out.println("You don't have this DVD");
    }
}

4. Class Database untuk menyimpan CD dan DVD< serta eksekusi program

import java.util.ArrayList;

public class Database{
    private ArrayList<CD> cds;
    private ArrayList<DVD> dvds;
    
    public Database(){
        cds = new ArrayList<CD>();
        dvds = new ArrayList<DVD>();
    }
    
    public void addCD(CD cd){
        cds.add(cd);
    }
    
    public void addDVD(DVD dvd){
        dvds.add(dvd);
    }
    
    public void list(){
        for(CD cd : cds){
            cd.print();
            System.out.println();   //garis kosong tiap entri
        }
        
        for(DVD dvd : dvds){
            dvd.print();
            System.out.println();   //garis kosong tiap entri
        }
    }
    
    public static void main(String[] args){
        Database db = new Database();
        
        CD cd1 = new CD("Ballads 1", "Joji", 12, 2106);
        cd1.setOwn(true);
        CD cd2 = new CD("A Head Full of Dreams", "Coldplay", 11, 2745);
        
        db.addCD(cd1);
        db.addCD(cd2);
        
        DVD dvd1 = new DVD("Endgame", "Anthony Russo", 10860);
        dvd1.setOwn(true);
        DVD dvd2 = new DVD("Joker", "Todd Phillips", 7320);
        dvd1.setOwn(true);
        
        db.addDVD(dvd2);
        
        db.list();
    }
}

5. Screenshot