From a3786fd82b1a2dd143a1e386de857cfd840b27b5 Mon Sep 17 00:00:00 2001
From: NCJOAQ <2627723488@qq.com>
Date: Wed, 6 Aug 2025 12:56:32 +0800
Subject: [PATCH] =?UTF-8?q?feat(class41):=20=E5=AD=97=E7=AC=A6=E4=B8=B2?=
 =?UTF-8?q?=E5=8A=9F=E8=83=BD=E7=90=86=E8=A7=A3=EF=BC=8C=E7=AE=80=E5=8D=95?=
 =?UTF-8?q?=E9=AA=8C=E8=AF=81?=
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- 新增 StringDemo1 类，演示字符串的创建和比较
- 实现简单的登录验证功能，包括用户名和手机号验证
- 展示字符串对象的创建方式和内容比较方法
---
 src/class41/StringDemo1.java | 49 ++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 src/class41/StringDemo1.java

diff --git a/src/class41/StringDemo1.java b/src/class41/StringDemo1.java
new file mode 100644
index 0000000..4084bc8
--- /dev/null
+++ b/src/class41/StringDemo1.java
@@ -0,0 +1,49 @@
+package class41;
+
+import java.util.Scanner;
+
+public class StringDemo1 {
+    public static void main(String[] args) {
+        String s1 = "hello"; //双引号直接创建的字符串对象，推荐
+        System.out.println(s1);
+        System.out.println(s1.length());
+
+
+        String s2 = new String("hello");
+        System.out.println(s2); //空字符串对象
+
+        System.out.println(s1 == s2); //比较两个字符串对象是否相等
+        System.out.println(s1.equals(s2));  //比较两个字符串对象的内容是否相等
+
+        String loginName = "admin";
+        System.out.println("请输入您的登陆名称");
+        Scanner sc = new Scanner(System.in);
+        String inputName = sc.next();
+        String number = "18888888888";
+        if(submit_login(loginName, inputName)){
+            if (check_number(number)){
+                System.out.println("登陆成功");
+            }
+            System.out.println("登陆失败，手机号验证错误");
+        }else{
+            System.out.println("登陆失败");
+        }
+
+
+
+
+    }
+    public static boolean submit_login(String loginName, String inputName){
+        return loginName.equals(inputName);
+    }
+    public static boolean check_number(String number){
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入手机号验证：");
+        String phone = sc.next();
+        System.out.println("系统显示以下手机号进入：");
+        String newPhone = phone.substring(0,3) + "******" + phone.substring(9);
+        System.out.println(newPhone);
+        return number.equals(phone);
+    }
+}
+