refactor: 네이밍 수정, NPE방지를 위해 isEmpty가 아닌 Collection Utils isEmpty로 처리

Author: Hchanghyeon

src/main/java/com/programmers/springweekly/ConsoleApplication.java

@@ -28,8 +28,8 @@ public void run(String... args) {
                 ProgramMenu selectMenu = ProgramMenu.from(console.inputMessage());
 
                 switch (selectMenu) {
-                    case CUSTOMER -> consoleCustomer.run();
-                    case VOUCHER -> consoleVoucher.run();
+                    case CUSTOMER -> consoleCustomer.menu();
+                    case VOUCHER -> consoleVoucher.menu();
                     case EXIT -> {
                         console.outputExitMessage();
                         running = false;

src/main/java/com/programmers/springweekly/ConsoleCustomer.java

@@ -8,6 +8,7 @@
 import java.util.UUID;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Component;
+import org.springframework.util.CollectionUtils;
 
 @Component
 @RequiredArgsConstructor
@@ -16,7 +17,7 @@ public class ConsoleCustomer {
     private final CustomerController customerController;
     private final Console console;
 
-    public void run() {
+    public void menu() {
         console.outputCustomerMenuGuide();
         CustomerMenu customerMenu = CustomerMenu.from(console.inputMessage());
 
@@ -31,14 +32,14 @@ public void run() {
     }
 
     private void selectCustomer() {
-        CustomerListResponse customerList = customerController.findAll();
+        CustomerListResponse customerListResponse = customerController.findAll();
 
-        if (customerList.getCustomerList().isEmpty()) {
+        if (CollectionUtils.isEmpty(customerListResponse.getCustomerList())) {
             console.outputErrorMessage("고객이 저장되어 있지 않습니다.");
             return;
         }
 
-        console.outputGetCustomerList(customerList);
+        console.outputGetCustomerList(customerListResponse);
     }
 
     private void deleteCustomer() {
@@ -68,14 +69,14 @@ private void createCustomer() {
     }
 
     private void getBlackList() {
-        CustomerListResponse customerBlacklist = customerController.getBlackList();
+        CustomerListResponse customerBlacklistResponse = customerController.getBlackList();
 
-        if (customerBlacklist.getCustomerList().isEmpty()) {
+        if (CollectionUtils.isEmpty(customerBlacklistResponse.getCustomerList())) {
             console.outputErrorMessage("블랙 리스트인 고객이 없습니다.");
             return;
         }
 
-        console.outputGetCustomerList(customerBlacklist);
+        console.outputGetCustomerList(customerBlacklistResponse);
     }
-    
+
 }

src/main/java/com/programmers/springweekly/ConsoleVoucher.java

@@ -10,6 +10,7 @@
 import java.util.UUID;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Component;
+import org.springframework.util.CollectionUtils;
 
 @Component
 @RequiredArgsConstructor
@@ -18,7 +19,7 @@ public class ConsoleVoucher {
     private final VoucherController voucherController;
     private final Console console;
 
-    public void run() {
+    public void menu() {
         console.outputVoucherMenuGuide();
         VoucherMenu voucherMenu = VoucherMenu.from(console.inputMessage());
 
@@ -64,7 +65,7 @@ private void deleteVoucher() {
     private void selectVoucher() {
         VoucherListResponse voucherListResponse = voucherController.findAll();
 
-        if (voucherListResponse.getVoucherList().isEmpty()) {
+        if (CollectionUtils.isEmpty(voucherListResponse.getVoucherList())) {
             console.outputErrorMessage("저장된 바우처가 없습니다.");
             return;
         }