forwarditerator.java

来自「《JAVA与模式》附书中源代码」· Java 代码 · 共 40 行

package com.javapatterns.iterator.copsandsales;

public class ForwardIterator implements Iterator
{

	public ForwardIterator(ShoppingCart anObj)
    {
		obj = anObj;
	}

	public void first()
    {
		state = 0;
	}

	public void next()
	{
		if (!isDone())
		{
			state++;
		}
	}

	public boolean isDone()
    {
		if (state>obj.count() - 1)
        {
			return true;
		}
		return false;
	}

	public Object currentItem()
    {
		return obj.currentItem(state);
	}
	
	private int state;
	private ShoppingCart obj;
}