Swap elements in LinkedList

Question

I want to maintain order of the elements being added in a list. So, I used a LinkedList in Java.

Now I want to be able to swap two elements in the linked list. First of all, I cannot find an elementAt() for LinkedList. Also, there is no way to add element at a specified position.

Answer 1

public class SwapNode {

public static Node head;

public static void main(String[] args) {
    SwapNode obj = new SwapNode();
    obj.insertAtEnd(5);
    obj.insertAtEnd(6);
    obj.insertAtEnd(4);
    obj.insertAtEnd(7);
    obj.insertAtEnd(3);
    obj.insertAtEnd(8);
    obj.insertAtEnd(2);
    obj.insertAtEnd(9);
    obj.insertAtEnd(1);
    obj.print(head);
    System.out.println("*** Swapped ***");
    obj.swapElementValue(4, 2);     
}

public void swapElementValue(int value1, int value2) {
    if (value1 == value2) {
        System.out.println("Values same, so no need to swap");
        return;
    }
    boolean found1 = false, found2 = false; 
    Node node = head;
    while (node != null && !(found1 && found2)) {
        if (node.data == value1) {
            node.data = value2;
            found1 = true;
            node = node.next;
            continue;
        }
        if (node.data == value2) {
            node.data = value1;
            found2 = true;
            node = node.next;
            continue;
        }
        node = node.next;
    }
    if (found1 && found2) {
        print(head);
    } else {
        System.out.println("Values not found");
    }
}

public void insertAtEnd(int data) {
    Node newNode = new Node(data);
    if (head == null) {
        head = newNode;
        return;
    }

    Node temp = head;
    while (temp.next != null) {
        temp = temp.next;
    }
    temp.next = newNode;
}

public void print(Node head) {
    Node temp = head;
    while(temp != null) {
        System.out.print(temp.data);
        temp = temp.next;
    }
    System.out.println();
}


static class Node {
    private int data;
    public Node next;

    public Node(int data) {
        this.data = data;
    }
}

}