Please provide all the steps to solve and test these methods

Please; provide all the steps to solve and test these methods, and comments to easy understand the code.

---Java problems--

(1) Complete; Java method so that it properly implements a swap between two
adjacent elements by adjusting only the links (and not the data) using a single
linked list.

--

// beforep is the cell before the two adjacent cells that are to be swapped.

// Assume that both p and afterp are not null.

public static void swapWithNext( Node beforep )
{
Node p, afterp;

....

....

....

}

(2) Complete; Java method so that it properly implements a swap between two

adjacent elements by adjusting only the links (and not the data) using a doubly
linked list.

--
// p and afterp are cells to be switched.

// Assume that p, beforep, and afterp are not null.

public static void swapWithNext( Node p )
{
Node beforep, afterp;

.....

.....

.....

}

Solution

Please find my imlementation.

1)
public static void swapWithNext( Node beforep )
{
Node p, afterp;

p = beforep.next;
afterp = p.next;

Node temp = afterp.next; // list after \'afterp\'

beforep.next = afterp;
afterp.next = p;
p.next = temp;
  
}

2)

public static void swapWithNext( Node p )
{
Node beforep, afterp;
  
beforep = p.prev;
afterp = p.next;

Node temp = afterp.next;

beforep.next = afterp;
afterp.prev = beforep;

afterp.next = p;
p.prev = afterp;

p.next = temp;
temp.prev = p;
  
}