System.out.println("4 销售商品"); System.out.println("0 退出系统");

System.out.println("================="); int i = 0; do { try {

type = Integer.parseInt(readString()); i = 0; }

catch (Exception e) { i = 1;

System.err.println("输入有误"); } }

while (i != 0); switch (type) { case 1:

Goods goods = new Goods();

System.out.println("请输入商品名称"); goods.setName(readString()); do { try {

System.out.println("请输入商品价格");

goods.setPrice(Integer.parseInt(readString())); i = 0; }

catch (Exception e) { i = 1;

System.err.println("输入有误"); } }

while (i != 0); do {