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POStack using double-linked list
 

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    <p>Hey. I am assigned to do Stack using double-linked list and I faced a problem. I can't link to previous element (while I had no problems using one link).</p> <pre><code>class Node { Data data; Node previous; Node next; } class Data { int size; double price; boolean isOnOffer; char sex; String brand; Data(int size, double price, boolean isOnOffer, char sex, String brand){ this.size = size; this.price = price; this.isOnOffer = isOnOffer; this.sex = sex; this.brand = brand; } } class Stack { private static int sizeOfStack; private static Node topElement; public static boolean isEmpty() { return topElement == null; } public static void Initialize() { sizeOfStack = 0; topElement = null; } public static void Push(Data x) { Node oldElement = topElement; topElement = new Node(); topElement.data = x; topElement.next = oldElement; topElement.previous = null; //oldElement.previous = topElement; // &lt;----- problem here sizeOfStack++; } public static void Pop() { if (!isEmpty()){ topElement = topElement.next; // delete first node sizeOfStack--; } } public static void Top() { int size = topElement.data.size; double price = topElement.data.price; boolean isOnOffer = topElement.data.isOnOffer; char sex = topElement.data.sex; String brand = topElement.data.brand; System.out.println(size + " " + price + " " + isOnOffer + " " + sex + " " + brand); } public static void Kill() { } public static void Print() { } public static void main(String[] args){ Push(new Data(37, 155, false, 'F', "Nike")); Push(new Data(38, 140, true, 'F', "Reebok")); Push(new Data(35, 160.99, false, 'F', "Converse")); Push(new Data(35, 20.99, true, 'F', "Inkaras")); Pop(); Pop(); Top(); } } </code></pre>
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    1. COit sound a bit like homework. If it is homework tag it. Otherwise: why are you implementing linked list by hand in java? Use ArrayList instead.
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    2. COI'd say null reference exception...
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    3. COTHere is no way of retrieving the top element. pop() should return the Data.
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      1. POStack using double-linked list
      1. USManoj
 

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