boundstack.java

来自「Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想」· Java 代码 · 共 46 行

package chapter11;

import java.util.Vector;
public class BoundStack<T> 
{
	private  int stackSize = 100; //设置栈的大小
	Vector <? extends T> stack =  new  Vector<T>();
	public BoundStack(int size)
	{
		stack.setSize(size);
	}
	//压栈
	public  boolean push(T o)
	{
		if(stack.size() >= stackSize)
		{
			System.out.println("栈溢出");
			return false;
		}
		else
		{
		   return stack.add(o);
		}
	}
	//出栈
	public  T pop()
	{
		if(!isEmpty())
		{
		    T o  = stack.lastElement();
		    stack.remove(o);
		    return o;
		}
		else
		{
			System.out.println("栈空");
			return null;
		}
	}
	//判定栈是否为空
	public boolean isEmpty()
	{
		return stack.isEmpty();
	}
}