如何把迭代器的数据返回到另一个类文件中

package com.imooc.work;

import java.util.HashSet;

/**

 * @author Jeff

 * @see 商品管理类

 */

public class GoodsMange {

static String str = "" ;

String s;

//导入数据

public void importGoods(Set s) {

Iterator<Goods> ir = s.iterator();

while (ir.hasNext()) {

str += ir.next()+"\n";

}

}

//显示数据

public void displayAllGoods() {

}

public static void main(String[] args) {

Goods good1 = new Goods("good001", "洗衣机", 3999.9, "十年不会坏！");

Goods good2 = new Goods("good002", "步步高点读机", 99.9, "孩子成绩不必担心！");

Goods good3 = new Goods("good003", "苹果手机", 8999, "面子十足！");

Goods good4 = new Goods("good004", "耐克运动鞋", 799.8, "跑道上信息百倍！");

Set<Goods> goodsSet = new HashSet<Goods>();

goodsSet.add(good1);

goodsSet.add(good2);

goodsSet.add(good3);

goodsSet.add(good4);

(new GoodsMange()).importGoods(goodsSet);

}

}