added constructor
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@ -20,12 +20,24 @@ class DoublyLinkedList{
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private Link tail;
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/**
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* Constructor
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* Default Constructor
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*/
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public DoublyLinkedList(){
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head = null;
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tail = null;
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}
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/**
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* Constructs a list containing the elements of the array
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* @param array the array whose elements are to be placed into this list
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* @throws NullPointerException if the specified collection is null
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*/
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public DoublyLinkedList(int[] array){
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if (array == null) throw new NullPointerException();
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for (int i:array) {
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insertTail(i);
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}
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}
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/**
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* Insert an element at the head
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