从没有 .clear() java 的链表中删除所有元素

Question

I want to remove all of the elements in my linked list without using the clear method.

This is my code currently

//-----inner class-----
private static class Node <T> { 
  private T data;
  //next just points 
  private Node<T> next; 

  //constructs a node 
  public Node(T data, Node<T> next){ 
     this.data = data; 
     this.next = next; 
  }

  public T getData(){ return data;} 

  public Node<T> getNext(){ return next;}

}

 private LinkedList<T> theList = new LinkedList<T>();
 private Node<T> head; 
 private Node<T> tail = null;
 private int size=0; 

public ListNoOrder() {
   this.head = null; 
   size = 0; 
}

//an add method 
public void add(T newElt) {
  //if the new element equals null
  //catch the exception
  try{ if (newElt==(null));}
  catch (Exception illegalArgumentException){
     throw new IllegalArgumentException();}

  //if it doesn't catch an exception it adds the element to the list 
  //and increment the size by one 


  //what does the head = new Node<T>(newElt, head) mean??? 
  head = new Node<T>(newElt, head);
  size++; 
}

The reset method that I want to implement If my current list has four objects after calling this method I want that list to have 0 objects

public void reset() {
     head = null;
 }

It should work but everytime I test it says nothing's been deleted. This is just bits and pieces of the complete code.

Answer 1

public void reset() {
     head = null;
 }

(You)

It should work but everytime I test it says nothing's been deleted. This is just bits and pieces of the complete code

(My comment)

You remove the reference to the first element of the list so then if are no reference this list exist only in memory of JVM and Garbage Colletor will remove it from memory, but you don't set the size to zero (size=0;) and when test or somthing else will check the list it stil informs that have for eg "size = 6". From the other side you have function that is reset your list

public ListNoOrder() {
   this.head = null; 
   size = 0; 
}

All comments written in BrokenEnglish :)