An instance of the DiskModel class represents the ArrayList of Disk objects that have been placed on the board. You should add a field to the class for this list.

You must implement 4 methods:

• A constructor that takes no parameters which initializes the empty ArrayList field
• A getDisks method which returns the ArrayList object
• A getNumDisks method which returns the number of Disks currently stored in the ArrayList
• An addDisk method which adds the disk parameter to the models ArrayList

My question is did I do it right...if not. How do I properly add an arraylist. And how to you use or put into the publlic void addDisk(Disk disk)

Disk.java DiskColor.java DiskModel.java X DisksApp.java Disks Panel.java 2 3e /** 4 * The model for the disk game 5 * which stores and ArrayList of Disks 6 */ 7 public class DiskModel { 28 // TODO: add fields. 9 100 /** 11 * Constructor. 12 * Creates empty ArrayList 13 */ 140 public DiskModel() { 0.15 ArrayList arrList = new ArrayList(); 16 17 } 18 19 /** 20 * @return the ArrayList of Disks 21 22 public ArrayList getDisks() { 23 return getDisks(); 24 } 25 26 /** 27 @return the number of placed disks 28 */ 290 public int getNumDisks() { 30 return getNumDisks(); 31 } 32 330 /** 34 * Add a new disk to the ArrayList 35 36 @param disk Disk to add 37 38 public void addDisk (Disk disk) { 39 ; 40 } 41 42 } 20 2 Disk.java DiskColor.java DiskModel.java X DisksApp.java Disks Panel.java 2 3e /** 4 * The model for the disk game 5 * which stores and ArrayList of Disks 6 */ 7 public class DiskModel { 28 // TODO: add fields. 9 100 /** 11 * Constructor. 12 * Creates empty ArrayList 13 */ 140 public DiskModel() { 0.15 ArrayList arrList = new ArrayList(); 16 17 } 18 19 /** 20 * @return the ArrayList of Disks 21 22 public ArrayList getDisks() { 23 return getDisks(); 24 } 25 26 /** 27 @return the number of placed disks 28 */ 290 public int getNumDisks() { 30 return getNumDisks(); 31 } 32 330 /** 34 * Add a new disk to the ArrayList 35 36 @param disk Disk to add 37 38 public void addDisk (Disk disk) { 39 ; 40 } 41 42 } 20 2