Node node = new Node(5); Node leftChild = new Node(3); node.setLeftChild(leftChild);
Node node = new Node(5); Node leftChild = new Node(3); node.setLeftChild(leftChild); Node retrievedLeftChild = node.getLeftChild();Package/library: The Node class is not part of a specific package or library. It is a widely-used data structure in computer science and can be implemented in any programming language, including Java.