package week1_0306;
/**
* ջ������ȳ� LIFO
*
* */
public class Stack {
private LinkedList storage = new LinkedList();
public void push(Object o)
{
storage.addFirst(o);
}
public Object pop()
{
return storage.removeFirst();
}
public Object peek()
{
return storage.get(0);
}
public boolean isEmpty()
{
if(storage.get(0)==null)
return true;
else return false;
}
public int size()
{
return storage.size();
}
}