Task $5($Rotation$)$

Make the method public static void rotation$($char$[]$ a$).$ The method should "rotate $"$ the elements in a table.

A rotation is done by putting the last element first, and all other elements are shifted one step to the right.

The following example shows an application:

$\text{'}$H$\text{'},$ II$\text{'}\}$

A rotation in an empty table or table with exactly one element should not give an error message, but

the rotation will then do nothing.

Exercise $6($Rotate several places$)$

We continue here from the previous task, and will be able to rotate more than one step.

Create the method public static void rotation$($char$[]$ a$,$ int $k),$ where $k$ is an arbitrary integer. If $k=1,$ the

method must do the same as in the previous task.

If $k>1,$ the method must give the same answer as if you use rotation$($a$)k$ times. If $k$ is negative, the

rotation must go in the opposite direction. There is no limit to the size of $k.$

The method must be designed so that it is relatively effective. One of the tests will measure

efficiency on large tables. The following examples show areas of use:

char$[]\text{'},\text{'}$B$\text{'},\text{'}$C$\text{'},\text{'}$D$\text{'},\text{'}$E$\text{'},\text{'}$F$\text{'},\text{'}$G$\text{'},\text{'}$H$\text{'},\text{'}$I$\text{'},\text{'}$J$\text{'}\}$; rotation$(a,3)$; $//$ a is now $\{\text{'}$H$\text{'},\text{'}$I$\text{'},\text{'}$J$\text{'},\text{'}$A$\text{'},\text{'}$B$\text{'},\text{'}$C$\text{'},\text{'}$D$\text{'},$

$\text{'}$E$\text{'},\text{'}$F$\text{'},\text{'}$G$\text{'}\}$ rotation$($a$,$

$-2)$; $//$ a is now $\{\text{'}$J$\text{'},\text{'}$A$\text{'},\text{'}$B$\text{'},\text{'}$C$\text{'},\text{'}$D$\text{'},\text{'}$E$\text{'},\text{'}$F$\text{'},\text{'}$G$\text{'},\text{'}$H$\text{'},\text{'}$I$\text{'}\}$ rotation$($a$,19)$; $//$ a is now $\{\text{'}$A$\text{'},\text{'}$B$\text{'},\text{'}$C$\text{'},\text{'}$D$\text{'},\text{'}$E$\text{'},$

$\text{'}$F$\text{'},\text{'}$G$\text{'},\text{'}$H$\text{'},\text{'}$I$\text{'},\text{'}$J$\text{'}\}$