TestCh20_Jim

// Jim Herrero - CH20TESTimport java.util.*;public class test20{  public int countZeroes(ListNode head)  {    int count = 0;    for(ListNode node = head; node != null; node = node.getNext())      if(node.getValue() == 0)        count++;  }  public void remove(Object obj)  {    if(head.getValue().equals(obj))    {      head = head.getNext();      return;    }    for(ListNode node = head; node != null; node = node.getNext())      if(node.getNext().getValue().equals(obj))      {        node.setNext(node.getNext().getNext());        return;      }  }  //23 - no clue  public Object removeFirst()  {    Object temp = head.getValue();    head = head.getNext();    tail.setNext(head);    head.setPrevious(tail);    return temp;  }  private void fixBackLinks()  {    //25 - no clue  }}