使用泛型和内部静态类实现栈（FILO，先进后出）

package tuple;
/**
 * 泛型实现的栈，FILO
 * @author Youjie
 *
 * @param <T>
 */
public class LinkedStack<T> {
	
	private static class Node<U> {
		U item;
		Node<U> next;
		public Node(U item, Node<U> next) {
			this.item = item;
			this.next = next;
		}
		public Node() {
			this.item = null;
			this.next = null;
		}
		
		boolean end(){return item == null && next == null;}
	}
	
	private Node<T> top = new Node<T>();
	
	public void push(T item){
		top = new Node<T>(item, top);
	}
	
	public T pop(){
		T result = top.item;
		if(!top.end()){
			top = top.next;
		}
		return result;
	}
	
	public static void main(String[] args) {
		LinkedStack<String> lss = new LinkedStack<String>();
		
		for(String s : "a,b,c,d,e".split(",")){
			lss.push(s);
		}
		String s;
		
		while((s=lss.pop())!=null){
			System.out.println(s);
		}
		
		
		
	}
}