Nomor 1.a

package nomor01;

class Node {
    int nilai;
    Node next;

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

public class SingleLinkedList {
	static Node head;

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

    public static void print() {
        Node aNode = head;
        while  (aNode != null) {
            System.out.print(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();
    }
}