extendsstack.java

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

package chapter11;
import java.util.*;
import chapter7.Duck;
public class ExtendsStack<T> extends Vector<T>
{
	private  int stackSize = 100; //设置栈的大小
    public ExtendsStack(int size)
    {
    	super();
    	this.stackSize = size;
    }  
    public boolean push(T o)
    {
    	if(this.size() >= stackSize)
		{
			System.out.println("栈溢出");
			return false;
		}
		else
		{
		   return this.add(o);
		}
    }
    public T pop()
    {
    	if(!isEmpty())
		{
		    T o  = this.lastElement();
		    this.remove(o);
		    return o;
		}
		else
		{
			System.out.println("栈空");
			return null;
		}
    }
    public static void main(String args[])
    {
    	ExtendsStack<Duck> s = new  ExtendsStack<Duck>(10);
    	s.push(new Duck());
    	s.pop().layEgg();
    }
}