Inital commitHEADmaster

1 files changed, 88 insertions, 0 deletions

diff --git a/labs/lab09_iterator/SListIterator.java b/labs/lab09_iterator/SListIterator.java
new file mode 100644
index 0000000..e58ea6d
--- /dev/null
+++ b/labs/lab09_iterator/SListIterator.java
@@ -0,0 +1,88 @@
+import java.util.NoSuchElementException;
+
+
+public class SListIterator<T>
+{
+	private Node firstNode;
+	private int numberOfEntries;
+	
+	public SListIterator()
+	{
+		firstNode = null;
+		numberOfEntries = 0;
+	}
+	
+	public void addToFirst(T aData)
+	{
+		firstNode = new Node(aData, firstNode);
+		numberOfEntries++;
+	}
+	
+	public T getEntry(int givenPosition)
+	{
+		T result = null;
+		
+		if((givenPosition >= 1) && (givenPosition <= numberOfEntries))
+		{
+			result = (getNodeAt(givenPosition)).data;
+		}
+		
+		return result;
+	}
+	
+	private Node getNodeAt(int givenPosition)
+	{
+		Node currentNode = firstNode;
+		
+		for(int counter = 1; counter < givenPosition; counter++)
+		{
+			currentNode = currentNode.next;
+		}
+		
+		return currentNode;
+	}
+	
+	public Iterator<T> getIterator()
+	{
+		return new IteratorForSList();
+	}
+	
+	private class IteratorForSList implements Iterator<T>
+	{
+		Node node;
+		
+		private IteratorForSList()
+		{
+			node = firstNode;
+		}
+		
+		public boolean hasNext()
+		{
+			return node != null;
+		}
+		
+		public T next()
+		{
+			T temp = node.data;
+			node = node.next;
+			return temp;
+		}
+		
+		public T remove()
+		{
+			throw new UnsupportedOperationException("remove() is not supported by this iterator");
+		}
+	}
+	
+	private class Node
+	{
+		private T data;
+		private Node next;
+		
+		private Node(T aData, Node nextNode)
+		{
+			data = aData;
+			next = nextNode;
+		}
+	}
+}