Java遍历Map、List、Array

int arr[] = {2, 3, 1};  
System.out.println("----1----排序前的一维数组");  
for (int x : arr) {
  System.out.println(x); //逐个输出数组元素的值  
}

public double getPayMoney() {
        //使用foreach遍历
        for (GoodOrder goodOrder : goodOrdersList) {
            List<HashMap<Good, Integer>> goods = goodOrder.getGood();
            //使用for遍历
            for (int i = 0; i < goods.size(); i++) {
                Map map = goods.get(i);
                Iterator iter = map.entrySet().iterator();
                //使用迭代器遍历
                while (iter.hasNext()) {
                    Map.Entry entry = (Map.Entry) iter.next();
                    int count = (Integer) entry.getKey();
                    Good gd = (Good) entry.getValue();
                    payMoney = (Double.valueOf(payMoney) + Double.valueOf(gd.getGood_price()) * count);
                }
            }

        }
        return payMoney;
    }