$3-($a$)$ Add the following methods to the SLL class:

$\backslash$table$[[$public void clear$(),$Empties the list$],[$public T getFirst$(),$Returns the info in the first node$],[$public T getLast$(),$Returns the info in the last node$],[$public int length$(),$Returns the number of elements in the list.$],[$public String toString$(),$Returns all the nodes as a string separated by space$]]$

$($b$)$ Update your TestStudentSLL class by adding options that test the additional methods above.

Note: to test the toString method, just print the list object instead of calling the printAll method.