From 8f3a52c938a10173114d234d889f2d4b9f1af831 Mon Sep 17 00:00:00 2001
From: seahi <me@seahi.me>
Date: Thu, 7 Nov 2024 18:36:45 +0800
Subject: [PATCH] =?UTF-8?q?=E6=A1=88=E4=BE=8B6-1=20=E6=A8=A1=E6=8B=9F?=
 =?UTF-8?q?=E8=AE=A2=E5=8D=95=E5=8F=B7=E7=94=9F=E6=88=90?=
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---
 src/chapter5/demo51/OrderID.java | 47 ++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/chapter5/demo51/OrderID.java

diff --git a/src/chapter5/demo51/OrderID.java b/src/chapter5/demo51/OrderID.java
new file mode 100644
index 0000000..c19285f
--- /dev/null
+++ b/src/chapter5/demo51/OrderID.java
@@ -0,0 +1,47 @@
+package chapter5.demo51;
+
+public class OrderID {
+    public static void main(String[] args) {
+        System.out.println("====String实现====");
+        int[] time = {2024, 1107, 1040};
+        String orderID = arrayToString(time);
+        System.out.println("订单号 " + orderID);
+
+        System.out.println("\n====StringBuffer实现====");
+        int[] time2 = {2023, 1006, 1200};
+        String orderID2 = arrayToString(time2);
+        System.out.println("订单号 " + orderID2);
+    }
+
+    /**
+     * 将数组拼接成字符串，并在首尾添加`OID:[]`
+     * 注意：使用String实现
+     * @param arr 存放数字的数组
+     * @return 拼接后的字符串，格式为`[202411071040]`
+     */
+    public static String arrayToString(int[] arr) {
+        String s = "";
+        s += "OID:[";
+        for (int c : arr) {
+            s += c;
+        }
+        s += ']';
+        return s;
+    }
+
+    /**
+     * 将数组拼接成字符串，并在首尾添加`OID:[]`
+     * 注：使用StringBuffer实现
+     * @param arr 存放数字的数组
+     * @return 拼接后的字符串，格式为`[202411071040]`
+     */
+    public static String arrayToStringUsingBuffer(int[] arr) {
+        StringBuffer sb = new StringBuffer();
+        sb.append("OID:[");
+        for (int c : arr) {
+            sb.append(c);
+        }
+        sb.append("]");
+        return sb.toString();
+    }
+}