Linked Data Structures - Java - page 775

EXAMPLE: (continued)

If you look only quickly at Display 15.14 you might think the following at the start
of the definition is an unimportant detail:

implements PubliclyCloneable

However, it ensures that the linked list class implements the Cloneable interface. In
order for a class to have a Java-approved clone method, it must implement the Clone-
able interface. It also allows you to make linked lists of linked lists and have a deep
copy clone method in the linked list of linked lists.
A sample class that implements the PubliclyCloneable interface is given in Dis-
play 15.15. Display 15.16 shows a demonstration program that makes a deep copy
clone of a linked list of objects of this sample class.

Display 15.15 A PubliclyCloneable Class (part 1 of 2)

1 public class StockItem implements PubliclyCloneable
2{
3 private String name;

4 private int number;

5 public StockItem( )

6 {

7 name = null ;

8 number = 0;

9 }

10 public StockItem(String nameData, int numberData)

11 {

12 name = nameData;

13 number = numberData;

14 }

15 public void setNumber( int newNumber)

16 {

17 number = newNumber;

18 }

(continued)