集合框架——LinkedList练习

/*使用LinkedList模拟一个堆栈或者队列数据结构。堆栈：先进后出  如同一个杯子。队列：先进先出 First in First out  FIFO 如同一个水管。*/import java.util.*;class DuiLie{private LinkedList link;DuiLie(){link = new LinkedList(); }public void myAdd(Object obj){link.addFirst(obj);}public Object myGet(){return link.removeFirst();}public boolean isNull(){return link.isEmpty();}}class  LinkedListTest{public static void main(String[] args) {DuiLie dl = new DuiLie();dl.myAdd("java01");dl.myAdd("java02");dl.myAdd("java03");dl.myAdd("java04");while(!dl.isNull()){System.out.println(dl.myGet());}}}