From 900a9908c82dfdc8c3443f4c7444f83435eac2da Mon Sep 17 00:00:00 2001
From: NCJOAQ <2627723488@qq.com>
Date: Wed, 6 Aug 2025 13:36:02 +0800
Subject: [PATCH] =?UTF-8?q?feat(class42):=20=E6=B7=BB=E5=8A=A0=E7=94=9F?=
 =?UTF-8?q?=E6=88=90=E9=9A=8F=E6=9C=BA=E9=AA=8C=E8=AF=81=E7=A0=81=E7=9A=84?=
 =?UTF-8?q?=E5=B7=A5=E5=85=B7=E7=B1=BB=E5=92=8C=E6=B5=8B=E8=AF=95=E7=B1=BB?=
 =?UTF-8?q?-=20=E6=96=B0=E5=A2=9E=20CodeUtils=20=E7=B1=BB=EF=BC=8C?=
 =?UTF-8?q?=E5=8C=85=E5=90=AB=E4=B8=A4=E7=A7=8D=E7=94=9F=E6=88=90=E9=9A=8F?=
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 =?UTF-8?q?=20-=20=E6=96=B0=E5=A2=9E=20StringTest2=20=E7=B1=BB=EF=BC=8C?=
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---
 src/class42/CodeUtils.java   | 35 +++++++++++++++++++++++++++++++++++
 src/class42/StringTest2.java | 17 +++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 src/class42/CodeUtils.java
 create mode 100644 src/class42/StringTest2.java

diff --git a/src/class42/CodeUtils.java b/src/class42/CodeUtils.java
new file mode 100644
index 0000000..a340bd0
--- /dev/null
+++ b/src/class42/CodeUtils.java
@@ -0,0 +1,35 @@
+package class42;
+
+public class CodeUtils {
+    public static String getCode(int n) {
+        StringBuilder code = new StringBuilder();
+        int Index;
+        for (int i = 0; i < n; i++){
+            //随机0-2
+            Index = (int)(Math.random() * 3);
+            switch ( Index){
+                case 0:
+                    code.append((char) (Math.random() * 26 + 'a'));
+                    break;
+                case 1:
+                    code.append((char) (Math.random() * 26 + 'A'));
+                    break;
+                case 2:
+                    code.append((int) (Math.random() * 10));
+                    break;
+            }
+        }
+        return code.toString();
+    }
+    public static String getCode2(int n){
+        String dict = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+        String code = "";
+        for (int i = 0; i < n; i++) {
+            int index = (int)(Math.random() * dict.length());
+            code += dict.charAt(index);
+        }
+        return code;
+    }
+
+
+}
diff --git a/src/class42/StringTest2.java b/src/class42/StringTest2.java
new file mode 100644
index 0000000..4c5643b
--- /dev/null
+++ b/src/class42/StringTest2.java
@@ -0,0 +1,17 @@
+package class42;
+
+public class StringTest2 {
+    public static void main(String[] args) {
+        String code= CodeUtils.getCode(4);
+
+        System.out.println(code);
+
+        String code2 = CodeUtils.getCode2(4);
+
+        System.out.println(code2);
+
+
+
+    }
+
+}