diff --git a/codes/it-31i45/18718682.java b/codes/it-31i45/18718682.java
new file mode 100644
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+++ b/codes/it-31i45/18718682.java
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+public class BubbleSort {
+	public static void bubbleSort(int[] arr) {
+		int n = arr.length;
+		for (int i = 0; i < n - 1; i++) {
+			for (int j = 0; j < n - i - 1; j++) {
+				if (arr[j] > arr[j + 1]) {
+					// 交换arr[j]和arr[j + 1]
+					int temp = arr[j];
+					arr[j] = arr[j + 1];
+					arr[j + 1] = temp;
+				}			
+			}
+		}
+	}	
+
+	public static void main(String[] args) {
+		int[] arr = {64, 34, 25, 12, 22, 11, 90};
+		bubbleSort(arr);
+		for (int i : arr) {
+			System.out.print(i + " ");
+		}
+	}
+}