diff --git a/codes/Yang04/18909633.java b/codes/Yang04/18909633.java
new file mode 100644
index 0000000000000000000000000000000000000000..3df71a24a926c33ee20f08e072cdfaa2d8ee66ab
--- /dev/null
+++ b/codes/Yang04/18909633.java
@@ -0,0 +1,18 @@
+public static void bubbleSort(int[] a, int n) {
+        if (a == null || n <= 1) return;
+
+        for (int i = 0; i < n - 1; i++) {
+            boolean swapped = false;
+
+            for (int j = 0; j < n - 1 - i; j++) {
+                if (a[j] > a[j + 1]) {
+                    int temp = a[j];
+                    a[j] = a[j + 1];
+                    a[j + 1] = temp;
+                    swapped = true;
+                }
+            }
+
+            if (!swapped) break;
+        }
+    }