NEED SERIOUS HELP CODING THIS PROGRAMMING ASAP

Code java:

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import java.util.Iterator;
import java.util.NoSuchElementException;
 
public class List<E> {
 
  private E[] listArray = (E[]) new Object[300];
  private int size = 0;
    private int currentPosition=0;
 
 
  /**
   * Inserts the specified element at the beginning of this list.
   *
   * @param element element to be appended to this list
   */
  public void addFirst(E element) {
    for (int i=size; i>0; i--) {
      listArray[size] = listArray[size-1];
    }
    listArray[0] = element;
    size++;
  }
 
  /**
   * Appends the specified element to the end of this list.
   *
   * @param element element to be appended to this list
   */
  public void addLast(E element) {
    for (int j=size; j>0; j++) {
        listArray[size] =listArray[size-1];
            }
    listArray[size] = element;
    size++;
  }
 
  /**
   * Removes all of the elements from this list.  The list will be
   * empty after this call returns.
   */
  public void clear() {
    for(int x=0; x<size;x++) {
        listArray[x]=null;
    }
    size=0;
  }
 
  /**
   * Returns <code>true</code> if this list contains the specified
   * element. More formally, returns <code>true</code> if and only
   * if this list contains at least one element <code>e</code> such
   * that (<code>o==null ? e--null : o.equals(e)</code>).
   *
   * @param o element whose presence in this list is to be tested
   * @return <code>true</code> if this list contains the specified element
      */
  public boolean contains(Object o) {
     throw new java.lang.RuntimeException("Method not implemented");
    }
 
 
 
 
  /**
   * Returns the first element from this list.
   *
   * @return the first element from this list
   * @throws NoSuchElementException if this list is empty
   */
  public E getFirst() {
    return listArray[0];
  }
 
  /**
   * Returns the last element from this list.
   *
   * @return the last element from this list
   * @throws NoSuchElementException if this list is empty
   */
  public E getLast() {
    return listArray[size-1];
  }
 
  /**
   * Returns the element at the specified position in this list.
   *
   * @param index index of the element to return
   * @return the element at the specified position in this list
   * @throws IndexOutOfBoundsException if the index is out of range (
   * <code>index < 0 || index >= size()</code>)
   */
  public E get(int index) {
for(index=0;index >=size;index++)
return listArray[index];
    throw new java.lang.RuntimeException("Method not implemented");
 
  }
 
  /**
   * Returns the index of the first occurrence of the specified element in
   * this list, or -1 if this list does not contain the element.
   *
   * @param o element to search for
   * @return the index of the first occurrence of the specified element in
   * this list, or -1 if this list does not contain the element
   */
  public int indexOf(Object o) {
    throw new java.lang.RuntimeException("Method not implemented");
  }
 
  /**
   * Returns <code>true</code> if this list contains no elements.
   *
   * @return <code>true</code> if this list contains no elements.
   */
  public boolean isEmpty() {
    return size == 0;
  }
 
  /**
   * Removes and returns the first element from this list.
   *
   * @return the first element from this list
   * @throws NoSuchElementException if this list is empty
   */
  public E removeFirst() throws NoSuchElementException {
    throw new java.lang.RuntimeException("Method not implemented");
  }
 
  /**
   * Removes and returns the last element from this list.
   *
   * @return the last element from this list
   * @throws NoSuchElementException if this list is empty
   */
  public E removeLast() {
    throw new java.lang.RuntimeException("Method not implemented");
  }
 
  /**
   * Returns the number of elements in this list.
   *
   * @return the number of elements in this list
   */
  public int size() {
      throw new java.lang.RuntimeException("Method not implemented");
 
  }
 
  /**
   * Returns an iterator over the elements in this list in proper sequence.
   *
   * @return an iterator over the elements in this list in proper sequence.
   */
  public Iterator<E> iterator() {
      public boolean hasNext() {
 
          if (size > currentPosition)
              return true;
 
          else
              return false;
      }
      public Object next() {
          return listArray[currentPosition];
      }
      public void remove(){
throw new java.lang.RuntimeException("Method not implemented");
 
    }
}

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What exactly is the problem/question?

i'm not sure how to code the iterator function my teacher never showed us and i'm not sure if i'm doing it right

You need to move the pointer (currentPosition) at some point, otherwise it will be an infinite iterator.