Stack updates.

1 files changed, 16 insertions, 1 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/esodata/QueueStack.java b/BJC-Utils2/src/main/java/bjc/utils/esodata/QueueStack.java
index c1a21b6..a2c2f32 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/esodata/QueueStack.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/esodata/QueueStack.java
@@ -6,7 +6,7 @@ import java.util.LinkedList;
 /**
  * A FIFO implementation of a stack.
  *
- * @param T
+ * @param <T>
  *                The datatype stored in the stack.
  * @author Ben Culkin
  */
@@ -28,11 +28,15 @@ public class QueueStack<T> extends Stack<T> {
 
 	@Override
 	public T pop() {
+		if(backing.isEmpty()) throw new StackUnderflowException();
+		
 		return backing.remove();
 	}
 
 	@Override
 	public T top() {
+		if(backing.isEmpty()) throw new StackUnderflowException();
+		
 		return backing.peek();
 	}
 
@@ -45,4 +49,15 @@ public class QueueStack<T> extends Stack<T> {
 	public boolean empty() {
 		return backing.size() == 0;
 	}
+	
+	@Override
+	public String toString() {
+		return backing.toString();
+	}
+	
+	@SuppressWarnings("unchecked")
+	@Override
+	public T[] toArray() {
+		return (T[]) backing.toArray();
+	}
 }