Nomor 1.b

package nomor01;

class Node {
	int nilai;
	Node next;
	Node prev;

	Node(int nilai) {
	this.nilai = nilai;
	this.next = null;
	this.prev = null;
	}
}

public class DoubleLinkedList {
	static Node head;

	public static void swapNodes( Node node1, int i) {
		Node temp1 = node1.prev;
		Node temp2 = temp1.prev;
		Node temp3 = node1.next;
		if(temp2!=null) {
			temp2.next = node1;
		}
		node1.prev = temp2;
		node1.next = temp1;
		temp1.prev = node1;
		temp1.next = temp3;
		if(temp3!=null) {
			temp3.prev = temp1;
		}
	}

	public static void print() {
		Node aNode = head;
		while  (aNode != null) {
			System.out.println(aNode.nilai + " ");
			aNode = aNode.next;
		}
	}

	public static void main(String[] args) {

		int i = 0;

		Node node1 = new Node(8);
		head = node1;
		Node node2 = new Node(6);
		Node node3 = new Node(4);
		node1.next = node2;
		node2.next = node3;

		swapNodes(node1, i);
		print();

	}
}