JAVA实现的数据结构

				public class Queue {
				    private java.util.LinkedList list = new java.util.LinkedList();
				    public Queue() {
				    }
				    public void clear() {
				        list.clear();
				    }
				    public boolean isEmpty() {
				        return list.isEmpty();
				    }
				    public T firstEl() {
				        return list.getFirst();
				    }
				    public T dequeue() {
				        return list.removeFirst();
				    }
				    public void enqueue(T el) {
				        list.addLast(el);
				    }
				    public String toString() {
				        return list.toString();
				    }
				}