Update

src/finalexam/Database/PermissionJudgment.java

@@ -34,9 +34,8 @@ public class PermissionJudgment {
             role = rs.getString("juese");
             System.out.println("当前收银员：" + rs.getString("xingming"));
             loginSuccess = true;
-        } else {
+        } else
             System.out.println("用户名或密码不正确，请重新输入");
-        }
         if (loginSuccess) {
             int choice;
             do {
@@ -58,11 +57,10 @@ public class PermissionJudgment {
                         break;
                     case 3:
                     case 5:
-                        if ("管理员".equals(role)) {
+                        if ("管理员".equals(role))
                             System.out.println("你可以执行该操作");
-                        } else {
+                        else
                             System.out.println("很抱歉，你没有权限执行该操作");
-                        }
                         break;
                     default:
                         System.out.println("无效的选择，请重新选择（1-6）");

src/finalexam/Database/ProductAdditionAndInquiry.java

@@ -17,7 +17,6 @@ public class ProductAdditionAndInquiry {
         Connection conn = DriverManager.getConnection(DBURL);
         Scanner scanner = new Scanner(System.in);
         int choice;
-
         do {
             System.out.println("===超市商品管理维护====");
             System.out.println("1、输入商品");

src/finalexam/Database/ProductModificationAndDeletion.java

@@ -31,9 +31,9 @@ public class ProductModificationAndDeletion {
                     pstmt = conn.prepareStatement("SELECT * FROM t_shangping WHERE tiaoma = ?");
                     pstmt.setString(1, codeToDelete);
                     rs = pstmt.executeQuery();
-                    if (!rs.next()) {
+                    if (!rs.next())
                         System.out.println("你输入的编码不存在，请重新输入");
-                    } else {
+                    else {
                         pstmt = conn.prepareStatement("DELETE FROM t_shangping WHERE tiaoma = ?");
                         pstmt.setString(1, codeToDelete);
                         pstmt.executeUpdate();
@@ -46,9 +46,9 @@ public class ProductModificationAndDeletion {
                     pstmt = conn.prepareStatement("SELECT * FROM t_shangping WHERE tiaoma = ?");
                     pstmt.setString(1, codeToModify);
                     rs = pstmt.executeQuery();
-                    if (!rs.next()) {
+                    if (!rs.next())
                         System.out.println("你输入的编码不存在，请重新输入");
-                    } else {
+                    else {
                         System.out.print("商品名称（" + rs.getString("mingcheng") + "）：");
                         String name = sc.nextLine();
                         sc.nextLine();