**Data Structures and Algorithms Using Java**

Describe the garbage collection method for the SinglyLinkedList structure, and give the line number of the code presented in Figure 4.15 of the text that accomplishes (i.e., actually initiates) the garbage collection.

,public class SinglyLinkedL 1st ivate Node h 11st header 3. publie singlyLinkedListo null; h.next nul1; hneNode() public boolean insert(Listing newlisting) 9, 10 { Node n ifin new Node ( ) ; nu1l)out of sesory retura false; else e n.next h.next n.1- newisting.deepCopy o return true; 7 19, 20, Public Listing fetch(String targetKey) { Node p#h.next ; hile(pt null&&(p.1.compareTo(targetkey) 0)) { p=p.next; itip := null) return p.1.deepCopy(O else return nul1; 28. 1 29 public boolean delete(String targetkey) 30, { Node q=h; 31. 32 Node p while (p h, next ; null && I(p. 1.compareTo(targetKey) 0)) 35 36 37 38. 39 { q.next=p.next ; return true; else 4 return false; publie boolean update(String targetkey, Listing newtistingl public boolean update(String targetKey, Listing newlisti { f i delete ( targetKey) false) return false; else if (insert (newListing) false) return false return true; Fcure 415 The implementation of the Singly Linked List Structure