Picture of the List

Here is the testing program (again):

 
public class GenericLinkedListTester
{
  public static void main( String[] args )
  {
    // create an empty generic linked list
    GenericLinkedList<Integer> list = new GenericLinkedList<>(); 
    
    // insert some integers (autoboxed)
    list.insertFirst( 4 );
    list.insertFirst( 3 );
    list.insertFirst( 2 );
    list.insertFirst( 1 );
   
    list.traverse();
    System.out.println("\n"); 
    
    // test getFirst()
    System.out.println("First: " + list.getFirst() );
    list.deleteFirst();
    list.traverse();
    System.out.println("\n"); 
    System.out.println("New First: " + list.getFirst() );
      
    // test getLast()
    System.out.println("Last : " + list.getLast() );
 
  }
}