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package bjc.utils.esodata;
import java.util.Deque;
import java.util.LinkedList;
/**
* A FIFO implementation of a stack.
*
* @param <T>
* The datatype stored in the stack.
* @author Ben Culkin
*/
public class QueueStack<T> extends Stack<T> {
private Deque<T> backing;
/**
* Create a new empty stack queue.
*
*/
public QueueStack() {
backing = new LinkedList<>();
}
@Override
public void push(T elm) {
backing.add(elm);
}
@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();
}
@Override
public int size() {
return backing.size();
}
@Override
public boolean empty() {
return backing.size() == 0;
}
@Override
public String toString() {
return backing.toString();
}
@SuppressWarnings("unchecked")
@Override
public T[] toArray() {
return (T[]) backing.toArray();
}
}
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