修改项目目录

src/chapter2/SuperMarket.java

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+package chapter2;
+
+import java.util.Scanner;
+
+public class SuperMarket {
+    /*
+     * 模拟商城购物小系统：
+     * 1.用户选择商品后，后台计算商品价格；
+     * 2.使用while循环实现用户多次购买商品。
+     */
+    public static void main(String[] args) {
+        double cup = 18.8;          //水杯价格
+        double apple = 12.5;        //苹果价格
+        double banana = 15.5;       //香蕉价格
+        int i = 0;                  // 用户购买的商品序列
+
+        String continueShopping = "Y";  // 是否继续购物
+        System.out.println("==============天津现代小卖部================");
+        System.out.println("1.水杯的价格为：" + cup + "元");
+        System.out.println("2.苹果的价格为：" + apple + "元");
+        System.out.println("3.香蕉的价格为：" + banana + "元");
+
+        while (continueShopping.equals("Y")) {
+            Scanner sc1 = new Scanner(System.in);
+            System.out.println("请输入你需要购买商品的序列号：");
+            i = sc1.nextInt();
+
+            switch (i) {
+                case 1:
+                    System.out.println("请输入你需要购买水杯的数量:");
+                    int cupnumber = sc1.nextInt();
+                    double cupnum = cupnumber * cup;
+                    System.out.println("你购买了水杯" + cupnumber + "个，需要花费" + cupnum + "元");
+                    break;
+                case 2:
+                    System.out.println("请输入你需要购买苹果的数量:");
+                    int applenumber = sc1.nextInt();
+                    double applenum = applenumber * apple;
+                    System.out.println("你购买了苹果" + applenumber + "斤，需要花费" + applenum + "元");
+                    break;
+                case 3:
+                    System.out.println("请输入你需要购买香蕉的数量:");
+                    int banananumber = sc1.nextInt();
+                    double banananum = banananumber * banana;
+                    System.out.println("你购买了香蕉" + banananumber + "斤，需要花费" + banananum + "元");
+                    break;
+            }
+
+            System.out.println("需要继续购买请输入Y，否则输入N");
+            continueShopping = sc1.next();
+        }
+
+        System.out.println("期待您的下次光临！");
+    }
+}