package dsa.adt;

import dsa.exception.StackEmptyException;

public interface Stack {
	//返回堆棧的大小
	public int getSize();
	
	//判斷堆棧是否為空
	public boolean isEmpty();
	
	//數據元素e入棧
	public void push(Object e);
	
	//棧頂元素出棧
	public Object pop() throws StackEmptyException;
	
	//取棧頂元素
	public Object peek() throws StackEmptyException;
}