diff --git a/codes/yuechao123/21917030.java b/codes/yuechao123/21917030.java
new file mode 100644
index 0000000000000000000000000000000000000000..2a37106dd2c0433f7841ecc5e2b8c03f2e19d3bd
--- /dev/null
+++ b/codes/yuechao123/21917030.java
@@ -0,0 +1,89 @@
+import java.util.Arrays;
+import java.util.Scanner;
+
+class BubbleSort {
+    
+    // 优化的冒泡排序算法
+    public static void bubbleSort(int[] arr) {
+        int n = arr.length;
+        boolean swapped;
+        
+        for (int i = 0; i < n - 1; i++) {
+            swapped = false;
+            
+            // 每轮将最大元素移动到末尾
+            for (int j = 0; j < n - i - 1; j++) {
+                if (arr[j] > arr[j + 1]) {
+                    // 交换元素
+                    int temp = arr[j];
+                    arr[j] = arr[j + 1];
+                    arr[j + 1] = temp;
+                    swapped = true;
+                }
+            }
+            
+            // 如果本轮没有交换，说明数组已有序
+            if (!swapped) break;
+        }
+    }
+    
+    // 生成随机数组
+    public static int[] generateRandomArray(int size) {
+        int[] array = new int[size];
+        for (int i = 0; i < size; i++) {
+            array[i] = (int)(Math.random() * 100); // 0-99的随机数
+        }
+        return array;
+    }
+    
+    // 主程序
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        
+        System.out.println("📊 冒泡排序程序");
+        System.out.println("1️⃣ 随机生成数组并排序");
+        System.out.println("2️⃣ 手动输入数组并排序");
+        System.out.print("选择选项 (1-2): ");
+        
+        int choice = scanner.nextInt();
+        int[] array;
+        int size;
+        
+        switch(choice) {
+            case 1:
+                System.out.print("➡️ 请输入数组大小: ");
+                size = scanner.nextInt();
+                array = generateRandomArray(size);
+                break;
+                
+            case 2:
+                System.out.print("➡️ 请输入数组元素个数: ");
+                size = scanner.nextInt();
+                array = new int[size];
+                System.out.println("➡️ 请输入" + size + "个整数:");
+                for (int i = 0; i < size; i++) {
+                    array[i] = scanner.nextInt();
+                }
+                break;
+                
+            default:
+                System.out.println("❌ 无效选择，使用随机数组");
+                array = generateRandomArray(10);
+                size = 10;
+        }
+        
+        // 显示原始数组
+        System.out.println("\n🔢 原始数组: " + Arrays.toString(array));
+        
+        // 执行排序并计时
+        long startTime = System.nanoTime();
+        bubbleSort(array);
+        long endTime = System.nanoTime();
+        
+        // 显示结果
+        System.out.println("🆙 排序数组: " + Arrays.toString(array));
+        double duration = (endTime - startTime) / 1e6; // 转换为毫秒
+        System.out.printf("⏰ 排序耗时: %.3f 毫秒\n", duration);
+        System.out.println("\n🎉 排序完成！");
+    }
+}