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public class LStack<T> implements StackInterface<T>
{
private Node firstNode;
public LStack()
{
firstNode = null;
}
public void push(T anEntry)
{
Node newNode = new Node(anEntry, firstNode);
firstNode = newNode;
}
public T pop()
{
T result = null;
if(firstNode != null)
{
result = firstNode.data;
firstNode = firstNode.next;
}
return result;
}
public T peek()
{
if(firstNode != null)
{
return firstNode.data;
}
return null;
}
public boolean isEmpty()
{
return firstNode == null;
}
public void clear()
{
firstNode = null;
}
private class Node
{
private T data;
private Node next;
private Node(T aData)
{
this(aData, null);
}
private Node(T aData, Node nextNode)
{
data = aData;
next = nextNode;
}
}
}
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