give me the answer for very low level

public void swap(T elCurrent, T elSwap)

• Which will receive 2 parameters, the current element (elCurrent) and the swap element (elSwap) that will be switched with each other.
• If the current element (elCurrent) is not in the list, the method should ignore the swap, and return null.

• Example:

When the method is applied with elCurrent = 7, elSwap = 40 to the following list :

4 33 7 8 55 1 2

Output will be:

4 33 40 8 55 1 2

When the method is applied with elCurrent = 10, elSwap = 40 to the following list :

4 33 7 8 55 1 2

Output will be:

4 33 7 8 55 1 2 //No change (current element is NOT in the list)

• Hint: You can call printAll( ) then in order to check the correctness of the method.