The document provides code snippets for adding and removing elements from a linked list data structure. The 'add' method includes logic for creating a new node either when the list is empty or by finding the correct position in a non-empty list. The 'remove' method details how to find a target node and advance the head if the target is found.

1. // Adding elements
public void add(String element) {
// For first element Head is null. So, create a new node and mark it as head.
// and increase numElements
if(head == null){
head = new StringNode(element, null);
numElements++;
} else {
// if not, find its place first.
// then create a node and mark position link to new node
// mark new node as link to positional node
StringNode node = head;
while(node.getLink() != null){
if(node.getData().compareTo(element) < 0){
break;
}
}
StringNode newNode = new StringNode(element, null);
newNode.setLink(node.getLink());
node.setLink(newNode);
numElements++;
}
}
// Removing elements
public boolean remove(String target)
{
StringNode targetNode = head;
boolean found = false;
while (targetNode!= null && !found)
{
if(targetNode.getData().equalsIgnoreCase(target))
found = true;

2. else
targetNode = targetNode.getLink();
}
if(found)
{
// copy the head to targetNode
// and then advance head to the next node.
targetNode.setData(targetNode.getLink().getData());
targetNode.setLink(targetNode.getLink());
numElements --;
}
return found;
}
Solution
// Adding elements
public void add(String element) {
// For first element Head is null. So, create a new node and mark it as head.
// and increase numElements
if(head == null){
head = new StringNode(element, null);
numElements++;
} else {
// if not, find its place first.
// then create a node and mark position link to new node
// mark new node as link to positional node
StringNode node = head;
while(node.getLink() != null){
if(node.getData().compareTo(element) < 0){
break;
}
}
StringNode newNode = new StringNode(element, null);
newNode.setLink(node.getLink());

3. node.setLink(newNode);
numElements++;
}
}
// Removing elements
public boolean remove(String target)
{
StringNode targetNode = head;
boolean found = false;
while (targetNode!= null && !found)
{
if(targetNode.getData().equalsIgnoreCase(target))
found = true;
else
targetNode = targetNode.getLink();
}
if(found)
{
// copy the head to targetNode
// and then advance head to the next node.
targetNode.setData(targetNode.getLink().getData());
targetNode.setLink(targetNode.getLink());
numElements --;
}
return found;
}