Question

// adds the given element to front of the list public void prepend(string e) { // todo: implement the logic given above }

Answer 1

The question involves implementing a 'prepend' method in computer programming to add an element to the front of a list, which is typically used in a linked list data structure.

Step-by-step explanation:

Implementing the prepend method in a Java program allows you to add an element at the beginning of a list. To write this method, one would typically maintain reference to the first node in a linked list structure. As you insert a new element, a new node is created, which becomes the new head, and its next reference points to the previous head.

Example Implementation:

Assuming we have a LinkedList class with Node as an inner class.

public void prepend(String e) {
Node newNode = new Node(e);
newNode.next = head;
head = newNode;
}

Here, newNode.next is assigned the current head of the list, effectively inserting the new element at the beginning. Then, head is updated to be the new node, thus maintaining the list structure with the new element at the front.