package AddTwoNumber;public class Link {public Node first=null;public Link() {}public Link(int i) {Node newNode = new Node(i);this.first = newNode;}//βpublic void insert(int i) {Node newNode = new Node(i);if(this.first == null) {this.first = newNode;}else {Node current = this.first;Node previous = current;while(current != null) {previous = current;current = current.next;}previous.next = newNode;}}public void display() {Node current = this.first;while(current != null) {current.display();current = current.next;}}public boolean isEmpty() {return (this.first == null);}}
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