Help me fix this error

Question

hi
i trying to implement this program i did not finish yet
but i have this error that i dont understand
i need help >> please explain it ,,what should i do to fix it
this is the program
package ics202.hw02;
import ics202.*;
import ics202.lab02.*;
public class MyDeQueue extends MySearchableContainer implements DeQueue{
    public DoublyLinkedList dl;
    public DoublyLinkedList.Element ee=null;
    public MyDeQueue()
    DoublyLinkedList dl=new DoublyLinkedList();
    public Object getFirst()
        if(dl.head == null)
            throw new ListEmptyException();
        else
            return dl.head.data;
    public Object getLast()   
        if(dl.tail == null)
            throw new ListEmptyException();
        else
            return dl.tail.data;
    public void addToFront (Object obj)
   DoublyLinkedList.Element element = new DoublyLinkedList.Element(obj, dl.head,ee)////here is the problem
        if(dl.head == null)
            dl.tail = element;
       dl. head = element;
    public void addToRear (Object obj)
    DoublyLinkedList.Element element = new DoublyLinkedList.Element(obj, ee,dl.tail)////here is the problem
        if(dl.head == null)
            dl.head = element;
        else
            dl.tail.next = element;
       dl. tail = element;
    /////here i will complete the program
public class DoublyLinkedList {
   protected Element head, tail;  
   public class Element {   
      Object data;
      Element next, previous;
      Element(Object obj, Element next, Element previous){
         data = obj; this.next = next;
         this.previous = previous;
      public Object getData(){return data;}
      public Element getNext(){return next;}
      public Element getPrevious(){return previous;}
  }} this is the interface
package ics202.hw02;
import ics202.*;
public interface DeQueue extends Container{
            public abstract Object getFirst();
        public abstract Object getLast();
        public void addToFront(Object obj);
        public void addToRear(Object obj);
        public Object removeFromFront();
          public Object removeFromRear();
      }         Ok when i compile the program i have these three errors
ics202.hw02.MyDeQueue is not abstract and does not override abstract method removeFromRear() in ics202.hw02.DeQueue
{color:#ff0000}an enclosing instance that contains ics202.hw02.MyDeQueue.DoublyLinkedList.Element is required
an enclosing instance that contains ics202.hw02.MyDeQueue.DoublyLinkedList.Element is required{color}
the red errors are about the two lines in the code that i wrote next to them '////here is the problem'
{color:#00ff00}the fisrt one because i did not finish >>>so ignore it {color}
Edited by: thewhale on Nov 12, 2009 3:51 AM

Answer 1

abillconsl wrote:
Yucca wrote:
thewhale wrote:
thank you very much abillconsl in pointing to my mistakeanother pointout is that you should visit the sun coding conventions to learn about acceptable indentation. Most people here appreciate good that looks tidy and is pleasant to browse through.I didn't think it looked all that bad - certainly not bad enough to stop me from having a look-see; and any problems I simply attributed to space-to-tab editor idiosyncrasies.Yes but it is not as clear as it could be with four whitespace indentations and this...
does not look attractive. Rather point out the small things before they become big.