迭代器模式

迭代器模式:提供一种方法访问一个容器对象中的各个元素,而又不需暴漏该对象内部的实现细节
例子:

public ArrayList selectSomeComputerInfo(String HQLSelect) throws DAOException{

ArrayList allGoodsInfo=new ArrayList();

List selectAllPOResult=null;

try{

..
selectAllPOResult=query.list();

Iterator allPOItem=selectAllPOResult.iterator();

while(allPOItem.hasNext()){

ComputerInfoPO oneComputerInfoPO=(ComputerInfoPO)allPOItem.next();
allGoodsInfo.add(oneComputerInfoPO);

...

}

}

....

}