变动：

1、新建测试类

customer-management/src/main/java/com/mycarinsurance/www/test/Test1.java

+package com.mycarinsurance.www.test;
+
+import java.util.LinkedList;
+
+/**
+ * description :
+ *
+ * @author 周澳平
+ * date :  2023-03-27 15:04
+ */
+public class Test1 {
+    public static void main(String[] args) {
+        LinkedList queue = new LinkedList();
+
+        queue.addLast("1");
+        queue.addLast("2");
+        queue.addLast("3");
+
+        System.out.println(queue.pollFirst());
+        System.out.println(queue.pollFirst());
+        System.out.println(queue.pollFirst());
+    }
+}